Transamidations in melt-mixed MXD6 and PA6I-6T polyamides: 1. Determination of the degree of randomness and block length by 1H-NMR analysis
详细信息 查看全文
- 作者：Corrado Berti ; Annamaria Celli ; Paola Marchese ; Simone Sullalti ; Micaela Vannini ; Cesare Lorenzetti
- 关键词：Polyamides ; Transamidation ; 1H NMR ; Randomness degree
- 刊名：European Polymer Journal
- 出版年：2012
- 出版时间：November, 2012
- 年：2012
- 卷：48
- 期：11
- 页码：1923-1931
- 全文大小：789 K
文摘
The evaluation of the randomness degree and block length of polyamides after interchange reactions is a key issue to estimate the transamidation progress, which strongly influences the final properties of the materials. The polymers under examination are poly(m-xylylene adipamide) (MXD6) and poly(hexamethylene isophthalamide-co-terephthalamide) (PA6I-6T). They were blended by extrusion and then treated in differential scanning calorimeter (DSC) in order to improve transamidations and copolymer formation. The molecular structure of the final materials was analysed by means of an efficient, new and fast method based on 1H NMR analysis. The results were compared to those obtained by the more widely used 13C NMR analysis.