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  • 1
    Electronic Resource
    Electronic Resource
    Alkanolamines. V. Reaction of m-Dinitrobenzene with Ethanolamines (1938)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 60 (1938), S. 1236-1237 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja01272a065
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  • 2
    Electronic Resource
    Electronic Resource
    Information Operations at Esso Research and Engineering Company (1969)
    s.l. : American Chemical Society
    Journal of chemical documentation 9 (1969), S. 207-212 
    Details
    ISSN: 1520-5142
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/c160035a005
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  • 3
    Electronic Resource
    Electronic Resource
    Heat and entropy of fusion of polypropylene (1964)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 8 (1964), S. 2723-2730 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: There are wide discrepancies in the literature values for the heat of fusion (ΔHu) of isotactic polypropylene. A study was therefore made of the variables affecting ΔHu as determined by differential thermal analysis. The results of this study show ΔHu for 100% “crystalline” polypropylene to be 2400 cal./mole repeating unit with 2σ = 300. The entropy of fusion is 5.4 e.u./repeating unit (2σ = 0.3). Thermal history, potential errors in sample-sensor contact as well as uncertainties in x-ray analysis for per cent crystallinity are discussed.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1964.070080618
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  • 4
    Electronic Resource
    Electronic Resource
    Properties of semicrystalline polyolefins: Poly-4-methyl-1-pentene (1964)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 8 (1964), S. 2789-2799 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: A study has been carried out of the thermodynamic properties, physical and mechanical properties, and crystallization behavior of poly-4-methyl-1-pentene (poly-4-MP). Data were obtained for the heat and entropy of fusion. Poly-4-MP is characterized by a comparatively high tensile strength, stiffness, and surface hardness. The impact is low at room temperature. The adverse effect of temperature on tensile strength, creep, and other polymer properties is greater for poly-4-MP than for polypropylene. Poly-4-MP is highly transparent, probably due to limited spherulite growth. Spherulitic growth was promoted through copolymerization with propylene by a technique of sequential monomer addition. The resultant product had an increased crystalline melting point (244 vs. 238°C. for the poly-4-MP homopolymer). The significance of these results and the effect of temperature on the birefringence of poly-4-MP are discussed.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1964.070080624
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  • 5
    Electronic Resource
    Electronic Resource
    Properties of semicrystalline polyolefins. IV. Crystallization phenomena in poly-3-methyl-1-butene (1965)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 9 (1965), S. 3023-3031 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: A study has been carried out of the physical and mechanical properties and crystallization behavior of poly-3-methyl-1-butene (poly-3-MB). The melt behavior of poly-3-MB was examined by means of the depolarized light intensity (DLI) technique. These birefringence studies indicated the onset of motion in the crystalline phase of poly-3-MB at about 100°C. (over 200°C. below the melting point). These studies also showed that limited molecular motion may occur at room temperature, i.e., about 25°C. below the glass transition temperature of poly-3-MB.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1965.070090908
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  • 6
    Electronic Resource
    Electronic Resource
    Properties of semicrystalline polyolefins. II. Copolymers of 3-methyl-1-pentene and 4-methyl-1-pentene (1965)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 9 (1965), S. 933-940 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: A study of the copolymerization of 3-methyl-1-pentene (3-MP) and 4-methyl-1-pentene (4-MP) showed that the poly-4-MP crystal lattice is capable of incorporating large quantities of 3-MP without a sharp lowering of melting point or adverse effect on physical and mechanical properties. The reactivity ratio of the two monomers in copolymerization are r(4-MP) = 6.2 ± 0.2 and r(3-MP) = 0.1 ± 0.1. As a result, mixed feeds containing up to 80% 3-MP produce copolymers composed primarily of repeating 4-MP units, with a random insertion of 3-MP monomer units. Calculations indicate that in a copolymer containing 37% 3-MP, the probability of finding a sequence of 2 units of 3-MP is only a little better than 5%. This copolymer shows a somewhat increased resistance to deformation under load than homopoly 4-MP. Its crystalline melting point is 248°C.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1965.070090311
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  • 7
    Electronic Resource
    Electronic Resource
    Fundamental studies on cationic polymerization. II. Mechanism and theory of inversion temperature (1963)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A: General Papers 1 (1963), S. 331-346 
    Details
    ISSN: 0449-2951
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Further studies with the isobutene-aluminum chloride-methyl chloride system has led to a better understanding of the dependence of degree of polymerization on monomer concentration and on temperature. Polymerizations were also carried out in C14-labeled methyl chloride to determine solvent incorporation in the polymer. A quantitative kinetic theory has been developed which explains the behaviour of the isobutene-aluminum chloride system in polar solvents such as methyl chloride, vinyl chloride, and ethyl chloride. The rate-determining step in propagation is polymer activation, presumably by ion separation. The DP of the polymer is determined principally by two competing chain-breaking processes; namely, chain transfer to monomer and/or chain breaking involving the solvent. The latter reaction becomes important in polar solvents at higher temperatures. The influence of phase separation has also been studied. The results indicate that the polymer molecule precipitates after it has under gone either a chain breaking or a chain termination reaction.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1963.100010130
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  • 8
    Electronic Resource
    Electronic Resource
    Fundamental studies on cationic polymerization. III. Extension of mechanism studies to homogenous systems (1963)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A: General Papers 1 (1963), S. 789-798 
    Details
    ISSN: 0449-2951
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Fundamental studies of the cationic polymerizations of isobutylene has been extended to the n-pentane and carbon disulfide systems. The kinetic equation for the n-pentane system is more complex than for other solvent systems because simplifying assumptions (which were possible for methyl chloride, ethyl chloride, and vinyl chloride) do not appear to be valid here. However, in all systems studied, the molecular weight of the polymer is determined principally by two competing chain breaking processes; namely, chain transfer from polymer to monomer and chain transfer or termination involving the solvent. The solvent reaction is important in polar solvents, especially at higher temperatures (e.g. -35°C.) but is much less important in either n-pentane or carbon disulfide systems.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1963.100010216
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  • 9
    Electronic Resource
    Electronic Resource
    Properties of semicrystalline polyolefins. III. Plasticization and crystallization phenomena in sterically hindered polyolefins (1965)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A: General Papers 3 (1965), S. 793-801 
    Details
    ISSN: 0449-2951
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Increasing crystallinity and spherulite growth in rigid polymers can lead to increased resistance to deformation. Crystallization is facilitated by plasticization which, by increasing chain or segmental mobility, may promote both nucleation and the rate of crystal growth. Evidence points to the latter effect of increased rate of crystal growth being the more important when the plasticization is effected via sequential copolymerization techniques. In a number of copolymer systems, the increased extent of crystal growth more than compensates for the plasticization effects on molecular mobility and as a result, the “copolymers” show higher crystalline melting points, higher heat distortion temperatures, and increased modulus.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1965.100030233
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  • 10
    Electronic Resource
    Electronic Resource
    Entropy and heat of fusion of polymers (1965)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A: General Papers 3 (1965), S. 1869-1875 
    Details
    ISSN: 0449-2951
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Methods are presented for estimating the entropy and heat of fusion of polyolefins, polyamides, polyesters, etc. Although the formulas are approximate, good agreement is obtained with experimental values, where available. For example, the calculated entropies for polypropylene, polyoxymethylene, nylon 66, polyester 210, and poly(ethylene terephthalate) are 5.4, 3.4, 11.2, 8.3, and 5.9 e.u./mole of repeating unit, respectively, as compared to the experimental values of 5.4, 3.5(3.9), 11, 7, and 5.8(5.4), respectively. Application of the formulas to the polyamides support the calorimetric and DTA estimates of the heats of fusion which are significantly greater (by 25-75%) than those determined by the diluent method. Thus, the calculations also indicate that the heats of fusion of the polyamides are higher than those of similar polyesters.
    Additional Material: 5 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1965.100030518
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