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1. |
Thermal stability of blends of poly(vinyl chloride) with polyester elastomer |
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Die Angewandte Makromolekulare Chemie,
Volume 226,
Issue 1,
1995,
Page 1-12
In‐Hwan Park,
Ja‐Soon Jang,
Yoshiki Chujo,
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摘要:
AbstractThe thermal stability of poly(vinyl chloride) (PVC) under air atmosphere was improved by blending with PETE (polyester elastomer). Its enhanced stability could be explained by a reaction between the ester component of PETE and HCl from dehydrochlorination of PVC, which was identified by IR‐ and1H‐NMR spectroscopy. The best result of thermal stability was shown at a composition of 100 parts of PVC with 4 parts of PETE. By surveys of glass transition temperatures, it was found that all PVC/PETE blends were ununiformly distributed. During processing, the fusion time and torque at fusion decreased as the quantity of PETE increased. The mechanical properties of the blends were also changed; as the quantity of PETE increased, tensile strength of the blends decreased, while impact strength increa
ISSN:0003-3146
DOI:10.1002/apmc.1995.052260101
出版商:Hüthig&Wepf Verlag
年代:1995
数据来源: WILEY
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2. |
Thermodynamic studies on some interpolymer interactions and stability of polycomplexes |
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Die Angewandte Makromolekulare Chemie,
Volume 226,
Issue 1,
1995,
Page 13-22
S. K. Chatterjee,
Shalini Nigam,
Mamta Chhabra,
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摘要:
AbstractStability constant and related thermodynamic parameters (ΔH° and ΔS°) of a multicomponent intermacromolecular complex consisting of poly(acrylic acid‐coacrylamide), poly(methacrylic acid‐co‐acrylamide) and poly(N‐vinylpyrrolidone) have been determined using known methods. A distinct stepwise disintegration of the complex at different temperatures has been observed, and this could be correlated with the stability constant and thermodynamic parameters calculated at various t
ISSN:0003-3146
DOI:10.1002/apmc.1995.052260102
出版商:Hüthig&Wepf Verlag
年代:1995
数据来源: WILEY
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3. |
Synthesis and characterization of cellulose/N‐methylolacrylamide/glycidyl methacrylate/methacrylic acid cation exchange resins |
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Die Angewandte Makromolekulare Chemie,
Volume 226,
Issue 1,
1995,
Page 23-37
M. H. Abo‐Shosha,
N. A. Ibrahim,
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摘要:
AbstractNew cation exchange resins based on cellulose/N‐methylolacrylamide (NMA)/glycidyl methacrylate (GMA)/methacrylic acid (MA) were prepared by polymerizing highly concentrated mixtures of NMA/GMA/MA in the presence of cellulose using a sodium persulfate/sodium sulfite redox system under different conditions including the concentrations of the redox system components, NMA and GMA as well as the polymerization temperature. Polymerization conditions were selected to synthesize three resins of different carboxy and nitrogen contents. Potentiometric titration showed that these resins were weakly basic cation exchangers of different strength. Water solubility and swellability as well as durability of these resins were examine
ISSN:0003-3146
DOI:10.1002/apmc.1995.052260103
出版商:Hüthig&Wepf Verlag
年代:1995
数据来源: WILEY
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4. |
Diffusion characteristics of vinyl chloride from PVC in slurry phase |
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Die Angewandte Makromolekulare Chemie,
Volume 226,
Issue 1,
1995,
Page 39-46
Erol Erbay,
Tülin Bilgiç,
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摘要:
AbstractThe porous nature of poly(vinyl chloride) (PVC) brings along the problem of residual vinyl chloride in the final product. Stripping techniques are developed to eliminate vinyl chloride to the desired levels. After a certain extent of monomer removal, the stripping rate of vinyl chloride is limited by diffusion. Therefore, the diffusion characteristics of vinyl chloride from PVC slurries was investigated. Stripping was carried out at the boiling point of water where the generated steam was used as a carrier substance. The boiling point of water was changed by elevating the pressures. The dependence of diffusion on concentration is put forward and the activation energy of diffusion was calculated.
ISSN:0003-3146
DOI:10.1002/apmc.1995.052260104
出版商:Hüthig&Wepf Verlag
年代:1995
数据来源: WILEY
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5. |
Oligomeric benzophenones as antioxidants for cellulose triacetate |
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Die Angewandte Makromolekulare Chemie,
Volume 226,
Issue 1,
1995,
Page 47-52
D. K. Patel,
S. R. Menon,
M. M. Patel,
J. S. Parmar,
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摘要:
AbstractCellulose triacetate films stabilized with oligomeric 2‐hydroxybenzophenone derivatives were subjected to oven ageing. The antioxidant efficiency of the oligomeric stabilizers was determined by carrying out measurements of percentage weight loss, change in carbonyl index and hydroxy index, and change in tensile strength and elongation at break. In general, the oligomeric benzophenones show better performance than their monomeric precursors in stabilizing cellulose triacetat
ISSN:0003-3146
DOI:10.1002/apmc.1995.052260105
出版商:Hüthig&Wepf Verlag
年代:1995
数据来源: WILEY
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6. |
The effect of ultrasound in ethyl methacrylate polymerization and depolymerization reactions |
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Die Angewandte Makromolekulare Chemie,
Volume 226,
Issue 1,
1995,
Page 53-57
Nezih Erolan,
Füsun Arisan,
Huceste Çatalgil‐Giz,
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摘要:
AbstractThe effect of ultrasound in ethyl methacrylate polymerization and depolymerization and the chain termination mechanism for ethyl methacrylate have been studied. Polymerization conversion at 60°C did not depend on energy (80 W) and frequency (35 kHz) of ultrasound applied. In ultrasound depolymerization studies at 20°C the governing termination mechanism was found to be disproportionation and the lower limiting molecular weight was Mn= 500 00
ISSN:0003-3146
DOI:10.1002/apmc.1995.052260106
出版商:Hüthig&Wepf Verlag
年代:1995
数据来源: WILEY
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7. |
Simple models for stress relaxation and yield phenomenon of phenolphthalein poly(ether ketone) |
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Die Angewandte Makromolekulare Chemie,
Volume 226,
Issue 1,
1995,
Page 59-69
Yanchun Han,
Yuming Yang,
Binyao Li,
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摘要:
AbstractAccording to stress relaxation curves of phenolphthalein poly(ether ketone) (PEK‐C) at different temperatures and the principle of time‐temperature equivalence, the master curves of PEK‐C at arbitrary reference temperatures are obtained. A coupling model (Kohlrausch‐Williams‐Watts) is applied to explain quantitatively the different temperature dependence of stress relaxation behavior and the relationship between stress relaxation and yield phenomenon is established through the coupl
ISSN:0003-3146
DOI:10.1002/apmc.1995.052260107
出版商:Hüthig&Wepf Verlag
年代:1995
数据来源: WILEY
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8. |
Reaktive membrancopolymere auf acrylbasis |
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Die Angewandte Makromolekulare Chemie,
Volume 226,
Issue 1,
1995,
Page 71-87
Christiane Abel,
Günter Malsch,
Ingeburg Lehmann,
Hans‐Jörg Ziegler,
Nico Scharnagl,
Margot Becker,
Hans‐Georg Hicke,
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摘要:
AbstractDie Copolymerisation des Acrylnitrils mit Maleinsäureanhydrid (MSA) wurde mit dem Ziel untersucht, acylfunktionalisierte Reaktivpolymere mit Filmbildungseigenschaften herzustellen, um diese in der Anwendung als Membran für kovalente Enzymfixierungen zu nutzen. Die radikalinitiierte Synthese der Copolymeren wurde in Lösung (Dimethylformamid (DMF), Dimethylacetamid (DMAC), γ‐Butyrolacton, Ethylencarbonat), durch Fällungscopolymerisation (Dioxan) sowie in Substanz durchgeführt.Die Polymercharakterisierung erfolgte durch IR‐Spektroskopie, Elementaranalyse, Kernresonanzspektroskopie, Gelpermeationschromatographie, Viskosimetrie, Osmometrie und Potentiometrie.Die Kinetik wurde durch dilatometrische Untersuchungen bis zu hohen Umsätzen verfolgt. Danach weist der Anhydridgehalt im Monomergemisch einen signifikanten Einfluß auf die Bruttopolymerisationsgeschwindigkeit und die Molmasse der Polymeren auf. Mit steigendem Anhydridanteil wird die Bruttopolymerisationsgeschwindigkeit herabgesetzt und eine Verringerung der Molmasse herbeigeführt. Die Copolymerisation von Acrylnitril und Maleinsäureanhydrid führt mit Ausnahme der Lösungspolymerisation in DMF bzw. DMAC zu Polymeren mit Molmassen oberhalb 30 000 g/mol, was ihre Anwendung als Membran ermöglicht. Die Einbaurate an Maleinsäureanhydrid in den Membranpolymeren ist bis einschließlich einer äquimolaren Zusammensetzung des Monomergemischs nicht größer als 5 mol‐%. Derartig niedrige MSA‐Reaktivgruppenanteile erweisen sich jedoch als ausreichend, um an einer aus einem Lösungspolymerisat (γ‐Butyrolacton, M̄η= 49 000 g/mol, c PMSA= 0,3 mol‐%) formierten Membran eine Enzymimmobilisierun
ISSN:0003-3146
DOI:10.1002/apmc.1995.052260108
出版商:Hüthig&Wepf Verlag
年代:1995
数据来源: WILEY
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9. |
Die swell of liquid crystal‐forming solutions of hydroxypropyl cellulose through a long capillary die |
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Die Angewandte Makromolekulare Chemie,
Volume 226,
Issue 1,
1995,
Page 89-99
Shinichi Suto,
Shingo Yoshida,
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摘要:
AbstractThe die swell and shear viscosity of lyotropic liquid crystal‐forming hydroxypropyl cellulose solutions in N,N‐dimethylacetamide were determined over a relatively wide range of shear stress or polymer concentration at 30°C by using a long capillary die with an aspect ratio of 114. The dependence of die swell on the concentration was similar to that of shear viscosity: a maximum at a critical concentration Caand a minimum at another critical concentration Cb(Ca
ISSN:0003-3146
DOI:10.1002/apmc.1995.052260109
出版商:Hüthig&Wepf Verlag
年代:1995
数据来源: WILEY
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10. |
Copolymerisation von butadien mit 1‐octen und 1‐dodecen mit einem neodymkatalysatorsystem |
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Die Angewandte Makromolekulare Chemie,
Volume 226,
Issue 1,
1995,
Page 101-109
Ralph Kaulbach,
Ulrich Gebauer,
Klaus Gehrke,
M. D. Lechner,
Klaus Hummel,
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摘要:
AbstractFür die Copolymerisationen des Butadiens mit 1‐Octen und 1‐Dodecen wurde das Katalysatorsystem Neodymoctoat/Ethylaluminiumsesquichlorid/Aluminiumtriisobutyl bei dem für die Polymerisation von Butadien optimalen Verhältnis der Katalysatorkomponenten eingesetzt. Der Einfluß der Monomermischungszusammensetzung auf die Copolymerzusammensetzung, den Umsatz, die Mikrostruktur, die zahlenmittleren Molmassen sowie die Molmassenverteilungen wurde untersucht. Die Copolymerisate besitzen einen deutlich höheren Verzweigungsgrad als das Polybutadien. Die Copolymerisationsparameter wurden nach Kelen‐Tüdßos bestimmt und ergaben für beide Copolymerisationen unterschiedlich große Parameter (rButadien≫ rOlefin). Neben der1H‐NMR Spektroskopie erfolgte der Copolymernachweis durch d
ISSN:0003-3146
DOI:10.1002/apmc.1995.052260110
出版商:Hüthig&Wepf Verlag
年代:1995
数据来源: WILEY
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