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1

Digitale Medien

New crystalline conformer in poly(N-acylethylenimine) copolymers containing pendant pentamethyldisiloxanyl groups (1992)

Cai, Gangfeng ; Litt, Morton H.

s.l. : American Chemical Society

Macromolecules 25 (1992), S. 2277-2279

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ISSN: 1520-5835

Quelle: ACS Legacy Archives

Thema: Chemie und Pharmazie , Physik

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1021/ma00034a033

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2

Digitale Medien

Synthesis and characterization of polythioetheramide from allylamine (1998)

Cai, Gangfeng

Springer

Polymer bulletin 41 (1998), S. 533-538

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ISSN: 1436-2449

Quelle: Springer Online Journal Archives 1860-2000

Thema: Chemie und Pharmazie , Maschinenbau , Physik

Notizen: Summary A novel polythioetheramide was synthesized from allylamine and 3-mercaptopropionic acid with a free-radical initiator. The thioether and amide linkages are formed from the free-radical addition of -SH group to double bond and the condensation between -NH2 and -COOH, respectively. The free-radical addition gives almost exclusively anti-Markovnikov product. The resulting polymer has a glass-transition temperature of 8.5 °C and a melting point of 145 °C. Though the introduction of the thioether linkages increases flexibility, the polymer retains good solvent resistance.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/s002890050398

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3

Digitale Medien

Synthesis and characterization of poly(N-acyl or N-aroyl ethylenimines) containing various pendant functional groups. III. Copolymers with pendant epoxy and imidazole groups (1996)

Cai, Gangfeng ; Litt, Morton H.

Bognor Regis [u.a.] : Wiley-Blackwell

Journal of Polymer Science Part A: Polymer Chemistry 34 (1996), S. 2701-2709

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ISSN: 0887-624X

Schlagwort(e): oxazolines ; copolymers ; poly(N-acylethylenimines) ; olefin ; pendant ; epoxy ; imidazole ; surface properties ; anticorrosion ; coatings ; epoxidation ; DSC ; WAXD ; crystalline ; Chemistry ; Polymer and Materials Science

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Notizen: Poly(N-acylethylenimines) with epoxy or imidazole groups randomly attached to the end of the side chains were synthesized from decenyl/heptyl oxazoline random copolymers. They are named as DH(m/n)-epoxy and DH(m/n)-imidazole, respectively, and the starting polymers are named as DH(m/n), where m and n represent the calculated numbers of monomers with and without epoxy or imidazole groups. The DH(m/n)-epoxy polymers with 20-60 mol % of epoxy crystallize two dimensionally with crystalline polymethylene plane separated by amorphous epoxy groups. The DH(m/n)-imidazole polymers are difficult to crystallize due to the strong interaction between the bulky imidazole group and amide group. Though the imidazole containing polymers are difficult to crystallize, they are good anticorrosion coatings as demonstrated by a preliminary anticorrosion test of the DH(20/80)-imidazole polymer on electrogalvanized steel, zinc/nickel electroplated steel, and hot dipped galvanized steel. © 1996 John Wiley & Sons, Inc.

Zusätzliches Material: 10 Ill.

Materialart: Digitale Medien

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4

Digitale Medien

Synthesis and characterization of poly(N-acyl or N-aroyl ethylenimines) containing various pendant functional groups. I. Copolymers with pendant olefin groups (1996)

Cai, Gangfeng ; Litt, Morton H.

Bognor Regis [u.a.] : Wiley-Blackwell

Journal of Polymer Science Part A: Polymer Chemistry 34 (1996), S. 2679-2688

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ISSN: 0887-624X

Schlagwort(e): oxazolines ; copolymers ; poly(N-acylethylenimines) ; olefin ; allyl ; pendant ; DSC ; WAXD ; crystalline ; Chemistry ; Polymer and Materials Science

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Notizen: Decenyl (D) and heptyl (H) oxazolines were copolymerized in o-dichlorobenzene solvent using methyl 4-nitrobenzenesulfonate as an initiator. A series of decenyl/heptyl oxazolines random copolymers (or DH copolymers) with a total degree of polymerization of 100 and narrow molecular weight distribution were obtained. These copolymers are considered as the poly(N-acylethylenimine)s with allyl pendant groups randomly attached to the far end of their polymethylene, (SINGLE BOND)(CH2)7(SINGLE BOND), side chains. The polymers were characterized by NMR, FT-IR. Both DSC and x-ray diffractometer demonstrated that the polymers are highly crystalline. © 1996 John Wiley & Sons, Inc.

Zusätzliches Material: 10 Ill.

Materialart: Digitale Medien

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5

Digitale Medien

Synthesis and characterization of poly(N-acyl or N-aroyl ethylenimines) containing various pendant functional groups. V. Random copolymers of 4-allyloxy and 4-methoxy phenyl oxazolines and their adducts with mercaptoacetic acid (1996)

Cai, Gangfeng ; Litt, Morton H.

Bognor Regis [u.a.] : Wiley-Blackwell

Journal of Polymer Science Part A: Polymer Chemistry 34 (1996), S. 2719-2727

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ISSN: 0887-624X

Schlagwort(e): oxazolines ; poly(N-acylethylenimines) ; poly(N-aroylethylenimines) ; copolymers ; allyloxy ; methoxyphenyl ; carboxyl ; mercaptoacetic acid ; pendant ; DSC ; WAXD ; crystalline ; surface properties ; adhesion ; anticorrosion ; coatings ; Chemistry ; Polymer and Materials Science

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Notizen: 4-Methoxyphenyl oxazoline (MPO) was synthesized from 4-methoxybenzonitrile and ethanolamine by using cadmium acetate as a catalyst. 4-Allyloxy phenyl oxazoline (APO) was synthesized from 4-allyloxybenzonitrile, which was made from 4-cyanophenol. A series of random copolymers of APO and MPO over the whole composition range, with an approximate degree of polymerization of 100, were synthesized. They are named as PAM(m/n), where m and n are the total number of APO and MPO monomer units. All the polymers are crystalline and show birefringence. Their melting points decrease with the increase of mole fraction of MPO, from 240°C for PAM(100/0) to 199°C for PAM(20/80), and then increase to 226°C for PAM(0/100). We reacted mercaptoacetic acid with the PAM(m/n) copolymers to generate polar groups that could strongly bond with metal surfaces. They are named as PAM(m/n)-SCH2COOH, which correspond to their starting PAM(m/n) copolymers. They were characterized by NMR, DSC, hot stage melting, water contact angle, peel strength measurements, and some preliminary anticorrosion tests on cold-rolled steel, electrogalvanized steel, and Zi/Ni electroplated steel. © 1996 John Wiley & Sons, Inc.

Zusätzliches Material: 7 Ill.

Materialart: Digitale Medien

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6

Digitale Medien

Poly(N-acylethylenimine) copolymers containing pendant pentamethyldisiloxanyl groups. II. Thermal behavior and x-ray diffraction study (1992)

Cai, Gangfeng ; Litt, Morton H.

Bognor Regis [u.a.] : Wiley-Blackwell

Journal of Polymer Science Part A: Polymer Chemistry 30 (1992), S. 659-669

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ISSN: 0887-624X

Schlagwort(e): oxazolines ; copolymers ; siloxane ; DSC ; WAXD ; poly(N-acylethyleneimines) ; heat of fusion ; intercalation ; siloxane ; Chemistry ; Polymer and Materials Science

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Notizen: Two series of random copolymers of 10-(pentamethyl disiloxanyl) decyl oxazoline (Si) with undecyl (U) (four copolymer compositions) and nonyl (N) (eight copolymer compositions) oxazolines over the whole composition range, with a total degree of polymerization of about 100, were studied by DSC and wide angle X-ray diffraction. All the polymers are crystalline. For the N/Si copolymers, the melting points, normalized ΔH and ΔS of fusion are almost constant in a broad range of copolymer composition from 10 to 65 mol % of Si. The rationale for this behavior is that the copolymers crystallize two dimensionally, with the crystalline polymethylene plates separated by the bulky flexible pentamethyl disiloxanyl (P) groups. In this range, increasing Si only increases the distance between the plates. With more than 65 mol % Si, the bulky P groups interfere with the packing of the alkyl chains and change the crystallization behavior; the polymers show disordered packing as demonstrated by their X-ray patterns and extremely low ΔH. In the U/Si copolymers, since the undecyl side chain has one more carbon than the decyl group to which the P group is attached, the P groups interfere much more strongly with the packing of the side chains than in the N/Si polymers. The copolymer melting points uniformly decrease as the concentration of Si increases. The plateau on the plot of normalized ΔH versus polymer composition is only from 10 to 50 mol % of Si. The average long spacings of the annealed polymers increase linearly from 24 Å (N/Si polymers) or 28 Å (U/Si polymers) to 34.1 Å with the increase of Si up to 50%. With more than 50% Si, the polymers have an identical lamellar thicknesses of 34 Å, within the experimental error. Copolymers with less than 75 mol % of Si can crystallize from hexadecane solutions forming gels down to polymer concentrations of 2-3 wt %. The long spacings of the gels are almost identical with those of the pure crystalline polymers and independent of the polymer/solvent ratios. When hexamethyl disiloxane is added to the solutions, it can intercalate and the resulting crystalline gels have long spacings larger than those found in the absence of siloxane.

Zusätzliches Material: 13 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/pola.1992.080300418

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7

Digitale Medien

Poly(N-acylethylenimine) copolymers containing pendant pentamethyldisiloxanyl groups. I. Synthesis (1992)

Cai, Gangfeng ; Litt, Morton H.

Bognor Regis [u.a.] : Wiley-Blackwell

Journal of Polymer Science Part A: Polymer Chemistry 30 (1992), S. 649-657

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ISSN: 0887-624X

Schlagwort(e): copolymers ; oxazolines, poly(N-acylethyleneimines) ; polydispersity ; siloxane ; Chemistry ; Polymer and Materials Science

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Notizen: 10-(Pentamethyl disiloxanyl) decyl oxazoline (Si) was synthesized. It was copolymerized with either undecyl (U) or nonyl (N) oxazolines using methyl 4-nitrobenzenesulfonate as initiator. Two series of random poly(N-acylethylenimine) copolymers, U/Si and N/Si, were synthesized over the whole composition range of Si monomer with a total degree of polymerization of about 100. Narrow molecular weight distributions were obtained. At a monomer to initator ratio of about 1060, the final degree of polymerization was 374 with a polydispersity index of 1.93. This shows the effect of chain transfer in this system.

Zusätzliches Material: 6 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/pola.1992.080300417

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8

Digitale Medien

Preparation and characterization of phenyl and undecyl oxazoline block copolymers (1989)

Cai, Gangfeng ; Litt, Morton H.

Bognor Regis [u.a.] : Wiley-Blackwell

Journal of Polymer Science Part A: Polymer Chemistry 27 (1989), S. 3603-3618

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ISSN: 0887-624X

Schlagwort(e): Chemistry ; Polymer and Materials Science

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Notizen: Undecyl and phenyl oxazolines were synthesized. They were copolymerized in different mole ratios using methyl nosylate as initiator. A series of di- and triblock copolymers with narrow molecular weight distributions as indicated by GPC were obtained. A three-armed block copolymer was also obtained by using 1,3,5-tris(bromomethyl)benzene as initiator. When the nonpolar undecyl block crystallized as a coating, the critical surface energy approached 21.0 dyn/cm, and the contact angle of water on the surface could be higher than 107°. The melting point increased as the chain length of crystallizable undecyl block increased, and the melting peak on DSC was very sharp when the length was equal to or longer than 25 monomer units. When these copolymers were coated on substrates, the work of adhesion with pressure sensitive adhesives was greatly reduced.

Zusätzliches Material: 11 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/pola.1989.080271105

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9

Digitale Medien

Synthesis and characterization of poly(N-acyl or N-aroyl ethylenimines) containing various pendant functional groups. IV. Poly (N-aroylethylenimines) with allyloxy and 3-hydroxy propyloxy groups (1996)

Cai, Gangfeng ; Litt, Morton H.

Bognor Regis [u.a.] : Wiley-Blackwell

Journal of Polymer Science Part A: Polymer Chemistry 34 (1996), S. 2711-2717

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ISSN: 0887-624X

Schlagwort(e): oxazolines ; poly(N-acylethylenimines) ; poly(N-aroylethylenimines) ; pendant ; copolymers ; allyloxy ; hydroxyl ; 9-BBN ; surface properties ; DSC ; WAXD ; crystalline ; Chemistry ; Polymer and Materials Science

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Notizen: 4-Allyloxy phenyl oxazoline was polymerized using methyl 4-nitrobenzene sulfonate as an initiator (M/I = 100/1) in o-dichlorobenzene. The olefin group in the resulting polymer, PAPO, was quantitatively transformed to a (SINGLE BOND)CH2 (SINGLE BOND)CH2 (SINGLE BOND)OH group by (1) hydroborating the olefin group using 9-BBN as a hydroborating agent in CHCl3/THF, and (2) oxidizing the hydroborated polymer. The polymer backbone is very stable in the hydroboration and oxidation environment. Both PAPO and the hydroxylated polymer, PAPO-OH, are crystalline and show birefringence. The PAPO-OH polymer crystallizes slowly due to its bulky side chain and strong interference of hydroxyl group with the packing of polymer molecules. However, once the polymer crystallizes, the side chains are extended and the (SINGLE BOND)OH groups do not hydrogen bond with the carbonyl groups in the polymer backbone. © 1996 John Wiley & Sons, Inc.

Zusätzliches Material: 7 Ill.

Materialart: Digitale Medien

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10

Digitale Medien

Synthesis and characterization of poly(N-acyl or N-aroyl ethylenimines) containing various pendant functional groups. II. Copolymers with pendant hydroxyl groups (1996)

Cai, Gangfeng ; Litt, Morton H.

Bognor Regis [u.a.] : Wiley-Blackwell

Journal of Polymer Science Part A: Polymer Chemistry 34 (1996), S. 2689-2699

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ISSN: 0887-624X

Schlagwort(e): oxazolines ; copolymers ; poly(N-acylethylenimines) ; pendant ; hydroxyl ; hydrogen bonding ; crystalline ; olefin ; surface properties ; 9-BBN ; FT-IR ; DSC ; WAXD ; crystalline ; Chemistry ; Polymer and Materials Science

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Notizen: Poly(N-acylethylenimines) with hydroxyl groups randomly attached to the end of the side chains were synthesized from decenyl/heptyl oxazoline random copolymers. The terminal olefin groups in the polymer side chains react quantitatively with 9-borabicyclo[3.3.1]nonane (9-BBN) in THF solvent. The hydroborated polymers can be oxidized and transformed to the polymers with (SINGLE BOND)OH in their side chains. The polymer backbone is very stable in the hydroboration and oxidation reaction environment. The polymers were named as DH-OH or DM(m/n)-OH, where m and n represent the calculated numbers of monomers with and without the (SINGLE BOND)OH group, respectively. The DH(m/n)-OH copolymers were studied by DSC, wide-angle x-ray diffraction, contact angle measurement, and FT-IR. They are crystalline and show birefringence. In polymers with high concentration of hydroxyl groups, the (SINGLE BOND)OH groups promote polymer crystallization due to their strong interactions. They have very high ΔH of fusion, sharp crystallization peaks, and small supercoolings. Wide-angle x-ray diffraction study of these polymers demonstrated that their alkyl side chains are not fully extended in crystalline domain as those in the DH copolymers. Data from advancing water/ethanol mixture contact angle measurement indicates that most of the (SINGLE BOND)OH groups in the copolymers are buried and the polymer surface is mainly composed of methyl or methylene group. FT-IR study in the carbonyl stretching region proves that the (SINGLE BOND)OH groups can bend back and form hydrogen bonding with the carbonyl groups in the polymer backbone. Though the DH-OH polymers show basically a hydrocarbon surface in a normal environment, both receding water contact angle and peel strength measurements demonstrate that the polymer surfaces can reorganize when they are in contact with a polar liquid. The buried (SINGLE BOND)OH groups can be “pulled” out by polar agents such as water or tape adhesive. © 1996 John Wiley & Sons, Inc.

Zusätzliches Material: 12 Ill.

Materialart: Digitale Medien

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