Chain extension in poly(butylene-adipate-terephthalate). In line testing in a laboratory internal mixer

被引：55
|
作者：
Costa, Anna Raffaela M. [1 ]
Almeida, Tatiara G. [1 ]
Silva, Suedina M. L. [1 ]
Carvalho, Laura H. [1 ]
Canedo, Eduardo L. [1 ,2 ]
机构：
[1] Univ Fed Campina Grande, Dept Mat Engn, BR-58429900 Campina Grande, PB, Brazil
[2] Pernambuco Inst Technol, BR-50720001 Recife, PE, Brazil
来源：
POLYMER TESTING | 2015年 / 42卷
关键词：
PBAT; Degradation; Chain extension; Internal mixer; Inline testing; POLY(BUTYLENE ADIPATE-CO-TEREPHTHALATE); MOLECULAR-WEIGHT; VISCOSITY; ACID); PBAT; PLA;
D O I：
10.1016/j.polymertesting.2015.01.007
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
This contribution is concerned with degradation and chain extension in poly(butylene-adipate-terephthalate), PBAT, compounded in a laboratory internal mixer with an epoxydic chain extender additive. Weight-average mass change during melt processing was estimated from temperature-torque-time data recorded by the equipment. The effect of the additive was found to be strongly dependent on processing temperature, and weakly dependent on concentration. Molar mass more than doubled at 230 degrees C with 2% additive. Long induction times and catastrophic failure to mix, occasionally observed with oligomeric additives processed in internal mixers, are discussed. Possible implementation of the procedure for real-time estimate of chain extension is also discussed. (C) 2015 Elsevier Ltd. All rights reserved.
引用
收藏
页码：115 / 121
页数：7
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