摘要:

AbstractThe mechanism of “flow process” defined as drawing by which neither crystallization nor molecular orientation takes place was clarified on the basis of its direct experimental evidences on drawing of “amorphous” poly(ethylene terephthalate) films. In a certain temperature range aboveTg, the polymer molecules are deformed and oriented on drawing, “inter‐molecular secondary linkage” playing an important role in the transmission of the applied force. When this intermolecular linkage breaks down above a certain critical temperature, the polymer molecules may slip past each other and flow independently, resulting in a large deformation without inducing any molecular orientation and crystallization. At higher temperatures crystallization occurs inducing the orient

ISSN:0025-116X    

DOI:10.1002/macp.1983.021840121

出版商:Hüthig&Wepf Verlag    

年代:1983

数据来源: WILEY

摘要:

AbstractIt is shown that the molten state and the semi‐crystalline state of polydisperse polyethylene are interrelated. Large polydisperse fractions obtained according to Pennings' fractionation method were studied by small angle X‐ray scattering and differential thermal analysis; the long period, depending on the molecular weight distribution, is shown to be given by the weight average end‐to‐end distance of the coils; the long chains with molecular weightsM>105behave as a series of “sub‐chains” with molecular weightM* = 105which crystallize independently. The same result is found for fractions with narrow molecular weight distribution and for mixtures of polyethyl

ISSN:0025-116X    

DOI:10.1002/macp.1983.021840122

出版商:Hüthig&Wepf Verlag    

年代:1983

数据来源: WILEY

ISSN:0025-116X    

DOI:10.1002/macp.1983.021840123

出版商:Hüthig&Wepf Verlag    

年代:1983

数据来源: WILEY

ISSN:0025-116X    

DOI:10.1002/macp.1983.021840124

出版商:Hüthig&Wepf Verlag    

年代:1983

数据来源: WILEY