Thermal and Sonochemical Degradation Kinetics of Poly(n-butyl methacrylate-co-alkyl acrylates): Variation of Chain Strength and Stability with Copolymer Composition
Thermal and Sonochemical Degradation Kinetics of Poly(n-butyl methacrylate-co-alkyl acrylates): Variation of Chain Strength and Stability with Copolymer Composition
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DOI：
10.1002/pen.23390
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发表时间：
2013-07-01
影响因子：
3.2
通讯作者：
Madras, Giridhar
中科院分区：
文献类型：
--
作者：
Bhagat, Rajesh;Madras, Giridhar
比较了聚（甲基丙烯酸正丁酯-丙烯酸烷基酯）的热降解和超声降解。为此，合成并表征了不同组成的聚（甲基丙烯酸正丁酯-co-丙烯酸甲酯）（PBMAMA）和特定组成的聚（甲基丙烯酸正丁酯-co-丙烯酸乙酯）（PBMAEA）和聚（甲基丙烯酸正丁酯-co-丙烯酸丁酯）（PBMABA）。聚合物的热降解表明，聚（丙烯酸烷基酯）的降解在一个阶段的无规断链和聚（甲基丙烯酸正丁酯）的降解在两个阶段。共聚物的热降解阶段数与共聚物的主要组分相同。随着共聚物中甲基丙烯酸正丁酯含量的增加，无规断链的活化能先增大后减小。研究了丙烯酸甲酯含量、丙烯酸烷基酯取代基和溶剂对这些共聚物超声降解的影响。采用连续分布动力学模型确定降解速率系数。PBMAMA的降解速率系数与甲基丙烯酸正丁酯含量呈非线性关系。甲基丙烯酸正丁酯-丙烯酸烷基酯共聚物的降解顺序为：PBMAMA < PBMAEA < PBMABA。的降解速率常数与共聚物的组成的变化进行了讨论有关的聚合物在溶液中的拉伸和主链中的电子位移的竞争效应。(C)2012年塑料工程师学会
The thermal degradation of poly(n-butyl methacrylate-co-alkyl acrylate) was compared with ultrasonic degradation. For this purpose, different compositions of poly (n-butyl methacrylate-co-methyl acrylate) (PBMAMA) and a particular composition of poly(n-butyl methacrylate-co-ethyl acrylate) (PBMAEA) and poly(n-butyl methacrylate-co-butyl acrylate) (PBMABA) were synthesized and characterized. The thermal degradation of polymers shows that the poly(alkyl acrylates) degrade in a single stage by random chain scission and poly(n-butyl methacrylate) degrades in two stages. The number of stages of thermal degradation of copolymers was same as the majority component of the copolymer. The activation energy corresponding to random chain scission increased and then decreased with an increase of n-butyl methacrylate fraction in copolymer. The effect of methyl acrylate content, alkyl acrylate substituent, and solvents on the ultrasonic degradation of these copolymers was investigated. A continuous distribution kinetics model was used to determine the degradation rate coefficients. The degradation rate coefficient of PBMAMA varied nonlinearly with n-butyl methacrylate content. The degradation of poly (n-butyl methacrylate-co-alkyl acrylate) followed the order: PBMAMA < PBMAEA < PBMABA. The variation in the degradation rate constant with composition of the copolymer was discussed in relation to the competing effects of the stretching of the polymer in solution and the electron displacement in the main chain. (C) 2012 Society of Plastics Engineers