Thermal stability of poly(N-vinyl-2-pyrrolidone-co-methacrylic acid) copolymers in inert atmosphere
Thermal stability of poly(N-vinyl-2-pyrrolidone-co-methacrylic acid) copolymers in inert atmosphere
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DOI：
10.1016/s0141-3910(03)00053-3
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发表时间：
2003-06-01
影响因子：
5.9
通讯作者：
Soldi, V
中科院分区：
文献类型：
--
作者：
Bianco, G;Soldi, MS;Soldi, V
用热重和红外光谱研究了聚(N-乙烯-2-吡咯烷酮-甲基丙烯酸)共聚物在惰性气氛中的热稳定性。热重曲线表明，这两个体系的有效降解发生在350-500℃的温度范围内，质量损失超过60%。在此温度下，活化能在160-200Umol(-1)(平均值)范围内，表明降解是通过链的随机断裂发生的。FTIR结果表明，降解的主要挥发性产物为CO2、CO和低分子量碳氢化合物(不饱和结构)。纯PVP还存在NH3的生成，而NH3的生成被大量的CO-2和CO的生成所抑制。结果表明，共聚物的热稳定性主要与N-乙烯-2-吡咯烷酮单体有关，随着共聚体系中甲基丙烯酸含量的增加而失去稳定性。(C)2003爱思唯尔科学有限公司。保留所有权利。
The thermal stability of poly(N-vinyl-2-pyrrolidone-co-methacrylic acid) copolymers was studied by thermogravimetry and infrared spectroscopy in inert atmosphere. The thermogravimetric curves suggested that the effective degradation of both systems occurred in the temperature range 350-500 degreesC with more than 60% mass loss. At this temperature, the activation energy was in the range 160-200 U mol(-1) (average values), suggesting that the degradation occurred by a random scission of the chain. The FTIR results indicated that the main volatile products of degradation are CO2, CO and hydrocarbons (unsaturated structures) with low molecular weight. Pure PVP also showed the formation of NH3 which was apparently suppressed in the copolymer by the formation of large amounts Of Co-2 and CO. The results suggested that the thermal stability of the copolymers was essentially associated with the N-vinyl-2-pyrrolidone monomer, losing stability when the percentage of methacrylic acid in the copolymer system was increased. (C) 2003 Elsevier Science Ltd. All rights reserved.