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  • 1
    Electronic Resource
    Electronic Resource
    Plasma-initiated polymerization of sodium sulfohexyl methacrylate (1983)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Letters Edition 21 (1983), S. 335-340 
    Details
    ISSN: 0360-6384
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1983.130210504
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  • 2
    Electronic Resource
    Electronic Resource
    Effect of stabilizers on the preparation of poly(ethylene terephthalate) (1982)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 20 (1982), S. 2053-2061 
    Details
    ISSN: 0360-6376
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Previous investigators have indicated that stabilizers will block the transesterification catalyst in the preparation of PET by the DMT process. This was not the case when triphenyl phosphate (TPP) or Irganox 1010 was used as the stabilizer and manganous acetate as the catalyst. Stabilizers in this study included TPP, trimethyl phosphate (TMP), tetraethylammonium hydroxide (TEAOH), Irganox 1010, and Irganox 1222. Their effect on the properties of PET made by the TPA process was investigated. It was observed that TPP and TMP greatly reduced the carboxyl content of PET and that the others had little or no effect. All stabilizers lowered the diethylene glycol content of PET. The rate of polycondensation was slightly increased when a small amount of Irganox 1010, Irganox 1222, or TMP was added. Proper concentration of stabilizer should be chosen to obtain good stability and low diethylene glycol content. Among the five stabilizers studied TPP was the best with respect to carboxyl and diethylene glycol content and thermal stability. The concentration of TPP should be kept under 0.04% by weight of PET.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1982.170200808
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  • 3
    Electronic Resource
    Electronic Resource
    Rate constants in the photopolymerization of H2O2-isoprene systems (1985)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 23 (1985), S. 3045-3051 
    Details
    ISSN: 0360-6376
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The polymerization reactions of isoprene with the use of H2O2 as the photoinitiator have been studied in acetone solutions. The lifetime of chain radicals, τs, was evaluated to be 0.29 by the rotating sector technique. The rate constants kp and kt were found to be 19.1 and 3.40 × 107 L/mol- s, respectively.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1985.170231212
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  • 4
    Electronic Resource
    Electronic Resource
    Thermotropic behavior of dimyristoylphosphatidylcholine in the presence of cytochrome c oxidase (1985)
    New York : Wiley-Blackwell
    Biopolymers 24 (1985), S. 883-895 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The thermotropic behavior of lipid vesicles prepared from dimyristoylphosphatidylcholine in the presence of cytochrome c oxidase has been studied by highly sensitive differential scanning microcalorimetry. This protein has a remarkable effect on the gel-liquid crystalline transition of dimyristoylphosphatidylcholine. In the presence of cytochrome c oxidase, the thermogram of the lipid vesicles exhibits a second endothermic peak, which is adjacent to the main lipid phase-transition peak and appears at a higher temperature. As the concentration of added protein increases, the two endothermic peaks become further separated, and the transition temperatures and the heats of transition corresponding to both endothermic peaks decrease. A greater decrease in the transition temperature at the lower-temperature peak with added protein suggests that the lower-temperature peak is more perturbed than the higher-temperature peak. The higher-temperature peak is not thermally reversible. Treatment of sample well above the transition temperature results in a reduction of the magnitude of the higher-temperature peak. The lipid-protein interaction contributing to the higher-temperature peak is discussed.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.360240511
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  • 5
    Electronic Resource
    Electronic Resource
    Further characterization of the structure and the thermal transitions of poly(p-oxybenzoate-co-p-phenylene isophthalate) polymers (1990)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 40 (1990), S. 1499-1510 
    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 series of poly(p-oxybenzoate-co-p-phenylene isophthalate)s were prepared by melt polycondensation of p-acotoxybenzoic acid, p-phenylene diacetate, and isophthalic acid followed by solid-state polymerization. The solid-state polymerization not only increased the molecular weight, but also annealed the copolyesters. The thermal stability, liquid crystallinity, thermal properties, and solid-state crystallinity of these copolyesters were investigated by TGA, polarized microscope, DSC, and wide-angle X-ray diffraction, respectively. It was found that copolyesters with HBA content of 50, 60, and 70 mol % showed explicit melt birefringence at 370°C and thus exhibited liquid crystalline state. The effect of annealing during solid-state polymerization on the thermal properties was discussed. The effect of copolymerization on their crystallinity was interpreted with X-ray diffraction qualitatively.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1990.070400907
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  • 6
    Electronic Resource
    Electronic Resource
    Copolyesters. III. Thermal degradation of poly(butylene terephthalate-co-adipate)s (1990)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 39 (1990), S. 225-232 
    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: The copolyesters of poly(butylene terephthalate) and poly(butylene adipate) were prepared by melt polycondensation of 1,4-butanediol, terephthalic acid, and adipic acid. The thermal stability was important for their use a shot melt adhesives. The thermal degradation of these copolysters and homopolyesters was determined through TGA, change of acid number, IR, GPC, and NMR analyses. It was found that the thermal stability of the copolysters in oxygen decreased as the content of butylene adipate increased at temperature above and below Tm. Thermal degradation occured in oxygen even at temperature lower than Tm, so that degradation would also occur at room temperature in air and embrittlement was found for these copolysters for long term service.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1990.070390202
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  • 7
    Electronic Resource
    Electronic Resource
    The solubility of gases and volatile liquids in polyethylene and polyisobutylene at elevated temperatures (1985)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 30 (1985), S. 1145-1165 
    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: The solubility of gases and volatile liquids in low-density polyethylene (LDPE) and polyisobutylene (PIB) at elevated temperatures has been correlated, using the experimental data available in the literature. In the present study, a Henry's constant Kp at a total pressure of approximately 1 atm defined as P1 = KPV10, where P1 is the partial pressure of the solute in the vapor phase and V10 is the solubility (cm3 solute/g polymer at 273.2 K and 1 atm), is correlated for nonpolar solutes with the following expressions: (1) For LDPE, ln(1/KP) = -1.561 + (2.057 + 1.438ω) (Tc/T)2; (2) For PIB, ln(1/Kp) = -1.347 + (1.790 + 1.568ω) (Tc/T)2, in which ω is the acentric factor and Tc the critical temperature of the solute. In obtaining the above correlations we have used 27 solutes covering 115 data points for LDPE, and 18 solutes covering 148 data points for PIB. We have calculated values of 1/Kp from the literature data reported in terms of the retention volume (Vg0), weight-fraction Henry's constant (H1), activity coefficient at infinite dilution (Ω1∞), Flory-Huggins interaction parameter (χ), or V10/P obtained from high pressure sorption experiments. The correlations obtained in this study permit one to estimate with reasonable accuracy the solubility of gases and volatile liquids in either LDPE or PIB, with information on the acentric factor (ω) and critical temperature (Tc) only. The relationship for LDPE is also applicable for solubilities in high-density polyethylene. Relationships for the heat of vaporization of solutes from infinitely dilute LDPE or PIB solutions are also derived from the temperature variation of 1/Kp.
    Additional Material: 14 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1985.070300320
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  • 8
    Electronic Resource
    Electronic Resource
    Copolyesters. IV. Copolyesters of polycaprolactone and poly(butylene terephthalate) (1990)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 39 (1990), S. 233-240 
    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: The copolyesters of poly(butylene terephthalate) and polycaprolactone were prepared by melt polycondensation. The charged form of the caprolactone unit was either caprolactone or polycaprolactonediol. The chemical structure of the copolyesters was investigated by proton NMR. It was found that the content of the caprolactone unit in copolyesters was lower than the charged value. The copolyesters prepared from both caprolactone and polycaprolactonediol were found to be random copolymers. Tm, Tg, and crystallinity of the copolyesters decreased as the content of caprolactone unit increased due to the copolymerization effect. The tensile strength, modulus, and hardness decreased as the content of caprolactone unit increased, which was consistent with the trend of crystallinity.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1990.070390203
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  • 9
    Electronic Resource
    Electronic Resource
    Copolyesters. I. Sequence distribution of poly(butylene terephthalate-co-adipate) copolyesters determined by 400 MHz NMR (1990)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 40 (1990), S. 1053-1057 
    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
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1990.070400537
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  • 10
    Electronic Resource
    Electronic Resource
    Effect of annealing on the thermal properties of poly(4-hydroxybenzoate-co-p-phenylene isophthalate)s (1990)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 191 (1990), S. 1301-1309 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: A series of poly(4-hydroxybenzoate-co-p-phenylene isophthalate)s (1) was prepared by melt polycondensation of 4-acetoxybenzoic acid, p-phenylene diacetate, and isophthalic acid followed by solid state polymerization. The thermal properties of the as-made samples were found to be significantly different from the second run thermal properties. The copolyesters with the same thermal history were annealed at 270°C in the DSC at various time intervals, and the thermal properties were further determined by DSC. For different compositions, annealing had different effects on the thermal properties of the copolyesters. With increasing annealing time the transition temperature and transition heat of 1 containing 50 and 60 mol-% of monomeric units (m. u.) of 4-hydroxybenzoic acid (HBA50 and HBA60) were found to increase. The second run DSC curves of HBA40, HBA30 and HBA20 (containing 40, 30 and 20 mol-% of 4-hydroxybenzoic acid m. u.) show two endotherms; transition heat and transition temperature of the lower temperature transition increase with the annealing time, but the transition heat of the higher temperature transition decreases. Finally, only one endotherm was observed for long-time annealing. The difference in thermal properties between the as-made sample and the second run could be described as annealing effect during solid state polymerization.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1990.021910609
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