Influence of molecular weight on the crystallization of poly(vinylidene fluoride)期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

Influence of molecular weight on the crystallization of poly(vinylidene fluoride)

Authors:	Enzo Benedetti Aldo D'Alessio Claudio Bertolutti Piergiorgio Vergamini Natalino Del Fanti Maurizio Pianca Giovanni Moggi

Affiliation:	(1) Dipartimento di Chimica e Chimica Industriale, Via Risorgimento, 35, I-56126 Pisa, Italy;(2) Montefluos C.R.S., Via S. Pietro, 50, I-20021 Bollate, Italy

Abstract:	Five samples of Poly (vinylidene fluoride) with a molecular weight from 45,000 to 260,000 were analyzed by means of FT-IR spectroscopy in order to study the influence of molecular weight $\left( {\bar Mv} \right)$ on the crystallization process. The spectra of films obtained from methylethylketone solutions revealed the prevalence of form II () in the case of lower $\bar Mv$ and of form III () in the higher molecular weight samples. The amount of form III was found to increase as the Mv decreased and as annealing temperatures increased. The deconvolution technique of vibrational spectra allowed detection of small amounts of other forms accompanying the prevailing one.

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