Real-time orientation and crystallinity measurements during the isotactic polypropylene film-casting process

被引：63

作者：

Lamberti, G ^{[1
]}

Brucato, V ^{[1
]}

机构：

[1] Univ Salerno, Dept Chem & Food Engn, I-84084 Fisciano, SA, Italy

来源：

JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS | 2003年 / 41卷 / 09期

关键词：

crystallinity; orientation; real-time measurements; FT-IR; poly(propylene) (PP);

D O I：

10.1002/polb.10411

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

A method based on Fourier transform infrared (FTIR) transmission spectra is proposed to measure the crystallinity of isotactic polypropylene (iPP) samples. The method parameters were tuned as compared with wide-angle X-ray scattering measurements performed on test samples characterized by different crystallinity values obtained by solidification of thin iPP films under several cooling rates in a homemade device. The FTIR dichroic ratio measurements were adopted to measure crystalline and average Hermans' orientation factors of iPP samples obtained by film casting. The crystalline orientation measurement method was validated as compared with the birefringence measurement. The techniques were successfully used in real time during some film-casting runs with a suitably modified FTIR system made of a spectrometer equipped with two optical guidelines and an external detector. Real-time measurements are reported and discussed. (C) 2003 Wiley Periodicals, Inc.

引用

页码：998 / 1008

页数：11

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