CRYSTALLIZATION SEGREGATION DSC STUDIES OF PP/PE COPOLYMERS

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CRYSTALLIZATION SEGREGATION DSC STUDIES OF PP/PE COPOLYMERS

Papers | Updated：2021-06-21

- CRYSTALLIZATION SEGREGATION DSC STUDIES OF PP/PE COPOLYMERS
- Vol. 19, Issue 1, Pages: 93-96(2001)
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- Published：20 February 2001
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CRYSTALLIZATION SEGREGATION DSC STUDIES OF PP/PE COPOLYMERS[J]. 2001, 19(1): 93-96.
DOI：

CRYSTALLIZATION SEGREGATION DSC STUDIES OF PP/PE COPOLYMERS[J]. 2001, 19(1): 93-96. DOI：

摘要

The structural analysis of two PP/PE copolymer samples

I and 2

was conducted by using 13C-NMR

GPC and crystallization segregation DSC (CSDSC) techniques. A pure polypropylene sample was also used for comparison. It was found that the two copolymer samples are very close in composition (the ethylene mol content is 4.3% and 4.5%

respectively)

stereoregularity (96% and 97%) and molecular weight (Mw

= 7.0 x 104 and 7.3x104; Mw/Mn = 5.0 and 6.1

respectively). While the CSDSC thermograms of the two samples are quite different from each other. Sample 1 shows a higher average melting temperature and a broader distribution of its thermogram. These phenomena were explained as an indication of a less uniform distribution of ethylene units along the PP chains for sample 1. It was noted that CSDSC is a very sensitive and convenient technique for structural studies of copolymers.

Abstract

The structural analysis of two PP/PE copolymer samples

I and 2

was conducted by using 13C-NMR

respectively)

stereoregularity (96% and 97%) and molecular weight (Mw

= 7.0 x 104 and 7.3x104; Mw/Mn = 5.0 and 6.1

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