Effect of different plasticizers on the secondary relaxation of poly(vinyl chloride)
作者:
Maria Pizzoli,
Giovanni Pezzin,
Giuseppina Ceccorulli,
期刊:
Journal of Macromolecular Science, Part B
(Taylor Available online 1977)
卷期:
Volume 14,
issue 2
页码: 241-250
ISSN:0022-2348
年代: 1977
DOI:10.1080/00222347708220367
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
Samples of poly(vinyl chloride) plasticized with variable amounts of either dibutyl phthalate (DPB) or dicyclohexyl phthalate (DCHP) were investigated by dynamic-mechanical measurements in the β relaxation temperature range. In this range of temperature, a superposition of the relaxation due to the cyclohexyl group with the PVC β peak was found for the samples plasticized with DCHP. By studying the dependence of the activation energy and of the peak broadness on the DCHP concentration it was possible to show that the PVC β relaxation is reduced to zero at the critical plasticizer weight fraction W1= 0.2. For the PVC-DBP series the β peak disappears at the same plasticizer content. These results strengthen the hypothesis that the β peak of PVC is due to a kind of cooperative motion since 1 mole of plasticizer for every 20 repeating units of the polymer is sufficient to suppress the PVC β relaxation.
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