ISSN:
0887-624X
Keywords:
condensation polymers
;
Worganonickel-organosilicon copolymers
;
organosilicon polymers
;
siloxane polymers
;
organometallic polymers
;
organonickel complexes
;
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Notes:
The synthesis and characterization of five novel organonickel-organosilicon alternating copolymers having the repeating unit —C6F4—Ni‘PBu3’2—C6F4—SiR2— [where SiR2 = —SiMe2—, —SiMe‘Hex’—, —SiPh2—, —SiMe2—O—SiMe2—, and —SiMe2—‘CH2’6—SiMe2—] are reported. The model compounds Ni‘PR3’2‘1,4-C6F4SiMe3’2‘PR3 = PMePh2 or PBu3’ were prepared via reactions of Ni‘PR3’2‘1,4-C6F4Li’2 with 2 equiv of SiMe3Cl, and were characterized by conventional analytical and spectroscopic measurements. The Polymers were prepared from the reactions of Ni‘PBu3’2‘1,4-C6F4Li’2 with 1 equivalent of SiMe2Cl2 ‘polymer 1, Mw = 15,800’, SiMe ‘Hex’ Cl2 ‘polymer 2, Mw = 7300’, SiPh2Cl2 ‘polymer 3, Mw = 8600’, O‘SiMe2Cl’2 ‘polymer 4, Mw = 13,900’ and ‘CH2’6‘SiMe2Cl’2 ‘polymer 5, Mw = 19,700’. The molecular weights for each polymer were fully determined by both GPC and VPO. The multinuclear ‘1H-, 19F-, and 31P [1H]’-NMR, FTIR, and UV-Visible spectroscopic data for each polymer unambiguously establishes its repeating unit structure. The observations indicate that introduction of the silyl or siloxane units into the organonickel backbones has remarkably decreased the chain rigidity of the organonickel-organosilicon polymers compared to their rigid rod organonickel analogues ‘i.e., —[—C6F4—Ni‘PR3’2—]n—’. © 1994 John Wiley & Sons, Inc.
Additional Material:
2 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/pola.1994.080321507
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