Stereocomplex Formation in Enantiomeric Polylactides by Melting Recrystallization of Homocrystals: Crystallization Kinetics and Crystal Morphology
Stereocomplex Formation in Enantiomeric Polylactides by Melting Recrystallization of Homocrystals: Crystallization Kinetics and Crystal Morphology
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通过同晶熔融重结晶在对映体聚丙交酯中形成立体络合物：结晶动力学和晶体形态
DOI：
10.1021/ma402405c
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发表时间：
2014-01-14
期刊：
影响因子：
5.5
通讯作者：
Chen, Bibo
中科院分区：
文献类型：
--
作者：
Na, Bing;Zhu, Jie;Chen, Bibo
研究了聚乳酸立体复合物的结晶动力学和结晶形态。通过分别在80和120 ℃下退火无定形1：1聚（L-丙交酯）/聚（D-丙交酯）共混物来产生具有α '-形式的小均晶和具有α-形式的大均晶。具有α '-形式的小均晶比具有α-形式的大均晶更有利于通过熔融重结晶形成立体复合物。此外，棒状立体复合物晶体是由在所采用的结晶温度下具有α '-形式的小同质晶体熔融产生的。与此相反，板状或球晶立体复合物晶体产生的熔融大的同质晶体与α-形式。立体复合物的晶体形态的差异与退火和结晶温度的成核密度的变化相关。
Crystallization kinetics and crystal morphology of polylactide stereocomplex through melting recrystallization of homocrystals was investigated in detail. Small homocrystals with the alpha'-form and large ones with the alpha-form were produced by annealing of amorphous 1:1 poly(L-lactide)/poly(D-lactide) blends at 80 and 120 degrees C, respectively. Small homocrystals with the alpha'-form were more favorable than large ones with the alpha-form for stereocomplex formation through melting recrystallization. Moreover, rod-like stereocomplex crystals were produced from melting of small homocrystals with the alpha'-form at the adopted crystallization temperatures. In contrast, plate-like or spherulitic stereocomplex crystals were generated by melting of large homocrystals with the alpha-form. The difference in the crystal morphology of sterecomplex was correlated with the variation of nucleation density regarding annealing and crystallization temperatures.