Influence of block length on crystallization kinetics and melting behavior of poly(butylene/thiodiethylene succinate) block copolymers
Influence of block length on crystallization kinetics and melting behavior of poly(butylene/thiodiethylene succinate) block copolymers
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DOI：
10.1007/s10973-013-3040-4
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发表时间：
2013-03
影响因子：
4.4
通讯作者：
M. Soccio;N. Lotti;A. Munari
中科院分区：
文献类型：
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作者：
M. Soccio;N. Lotti;A. Munari
研究了具有相同化学组成的聚丁二酸丁二醇酯/硫代二乙撑酯嵌段共聚物（PBSPTDGS）的熔融行为和结晶动力学。BS：TDGS = 50：50 mol %）的差示扫描量热法研究。PBSPTDGS样品中证明了多个吸热，因为熔融和重结晶过程，类似于聚（丁二酸丁二醇酯）（PBS）。应用Hoffman-Weeks方法，对共聚物进行了表征。根据Avrami处理方法分析了等温结晶动力学。具有长PBS嵌段的共聚物（PBSPTDGS 15）的特征在于相对于纯PBS的非常相似的行为，表明PBS大分子折叠不受不可结晶的硫代二乙烯琥珀酸酯嵌段的存在的影响。在所有其他情况下，整体结晶速率被发现减少，因为嵌段长度减少，即使工作的链折叠，来自霍夫曼-劳里岑成核理论的基础上，也减少了与嵌段长度。
The melting behavior and the crystallization kinetics of block poly(butylene/thiodiethylene succinate) copolymers (PBSPTDGS) with identical chemical composition (i.e., BS:TDGS = 50:50 mol %) were investigated by means of differential scanning calorimetry. Multiple endotherms were evidenced in PBSPTDGS samples, because of melting and recrystallization processes, similar to poly(butylene succinate) (PBS). By applying the Hoffman–Weeks’ method, theof the copolymers was derived. The isothermal crystallization kinetics was analyzed according to the Avrami’s treatment. The copolymer with long PBS blocks (PBSPTDGS15) is characterized by a very similar behavior with respect to pure PBS, indicating that PBS macromolecular folding is not affected by the presence of noncrystallizable thiodiethylene succinate blocks. In all the other cases, the overall crystallization rate was found to decrease as the block length is decreased, even though the work of chain folding, derived on the basis of Hoffman–Lauritzen nucleation theory, also decreased with the block length.