Thermal degradation of poly(3-hydroxybutyrate) and poly(3-hydroxybutyrate-co-3-hydroxyvalerate) as studied by TG, TG-FTIR, and Py-GC/MS
Thermal degradation of poly(3-hydroxybutyrate) and poly(3-hydroxybutyrate-co-3-hydroxyvalerate) as studied by TG, TG-FTIR, and Py-GC/MS
复制标题
DOI：
10.1002/app.12249
复制
发表时间：
2003-08-08
影响因子：
3
通讯作者：
Cheung, MK
中科院分区：
文献类型：
--
作者：
Li, SD;He, JD;Cheung, MK
采用热重法（TG）研究了聚3-羟基丁酸酯（PHB）和3-羟基丁酸-3-羟基戊酸共聚物[poly（HB-HV）]在氮气气氛下的热降解动力学。结果表明，随着升温速率（B）的增大，热降解温度（T-o，T-p，T-f）增大。聚（HB-HV）比PH B热稳定，因为它的热降解温度T-o（0）、T-p（0）和T-f（0）-通过外推到B = 0 ℃/min确定-比PH B的热降解温度高13 ℃-15 ℃。采用TG-FTIR和Py-GC/MS研究了聚羟基丁酸酯和聚羟基丁酸酯在氮气气氛下的热降解机理。结果表明，聚羟基丁酸酯的热降解产物主要为丙烯、2-丁烯酸、2-丁烯酸丙烯酯和2-丁烯酸丁酸酯;而聚（HB-HV）的那些主要是丙烯、2-丁烯酸、2-戊烯酸、2-丁烯酸丙烯酯、2-戊烯酸丙烯酯、2-丁烯酸丁酸酯，戊酸-2-戊烯酸酯和CO2。降解可能是由酯键断链引起的。(C)2003 Wiley Periodicals，Inc.
The thermal degradation kinetics of poly(3-hydroxybutyrate) (PHB) and poly(3-hydroxybutyrate-co-3-hydroxyvalerate) [poly(HB-HV)] under nitrogen was studied by thermogravimetry (TG). The results show that the thermal degradation temperatures (T-o, T-p, and T-f) increased with an increasing heating rate (B). Poly(HB-HV) was thermally more stable than PHB because its thermal degradation temperatures, T-o(0), T-p(0), and T-f(0)-determined by extrapolation to B = 0degreesC/min-increased by 13degreesC-15degreesC over those of PHB. The thermal degradation mechanism of PHB and poly(HB-HV) under nitrogen were investigated with TG-FTIR and Py-GC/MS. The results show that the degradation products of PHB are mainly propene, 2-butenoic acid, propenyl-2-butenoate and butyric-2-butenoate; whereas, those of poly(HB-HV) are mainly propene, 2-butenoic acid, 2-pentenoic acid, propenyl-2-butenoate, propenyl-2-pentenoate, butyric-2-butenoate, pentanoic-2-pentenoate, and CO2. The degradation is probably initiated from the chain scission of the ester linkage. (C) 2003 Wiley Periodicals, Inc.