Changes in molecular mobility of sorbitol plasticized starch during aging

被引：1

作者：

Fricova, Ol'ga ^{[1
]}

Hutnikova, Maria ^{[1
]}

机构：

[1] Tech Univ Kosice, Fac Elect Engn & Informat, Letna 9, Kosice 04200, Slovakia

来源：

JOURNAL OF APPLIED POLYMER SCIENCE | 2022年 / 139卷 / 39期

关键词：

biopolymers; molecular mobility; NMR; plasticizer release; thermal analysis; thermoplastics; GLASS-TRANSITION; NMR; CRYSTALLINITY; GLYCEROL; SPECTROSCOPY; POLYMORPHISM; H-1;

D O I：

10.1002/app.52948

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

Thermoplastic corn starch with 0.4 parts by weight of sorbitol plasticizer was studied using dynamic-mechanical thermal analysis (DMTA) and hydrogen nuclear magnetic resonance (H-1 NMR) to assess the changes in molecular mobility during a period of 26 weeks of storage. Motional heterogeneity of this thermoplastic starch (TPS) was found even after a short aging time by means of DMTA. Besides the glass transition processes in starch-rich and plasticizer-rich domains, other relaxation processes appear in TPS samples aged for a longer time. Sorbitol release and/or some moisture uptake was observed in H-1 NMR spectra of long-aged samples. After the whole monitored aging period, sample surfaces were covered with white powder due to sorbitol leakage from the TPS structure.

引用

页数：10

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