Rapid preparation and continuous processing of polylactide stereocomplex crystallite below its melting point
Rapid preparation and continuous processing of polylactide stereocomplex crystallite below its melting point
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熔点以下聚丙交酯立体络合物微晶的快速制备和连续加工
DOI：
10.1007/s00289-018-2544-2
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发表时间：
2019-07-01
期刊：
影响因子：
3.2
通讯作者：
Li, Zhong-Ming
中科院分区：
文献类型：
--
作者：
Gao, Xin-Rui;Niu, Ben;Li, Zhong-Ming
本文提出了一种可行的挤出法制备聚乳酸立体配合物（PLA）的工艺方案，即选择低于其熔点的加工温度来抑制PLA的热降解和均晶化。同时，引入柔性可生物降解的聚己二酸丁二酯（PBAT），以提高固体SC结晶的可加工性。通过广角x射线衍射和不同的扫描量热测试清楚地证实，在没有进一步热处理的情况下，形成了高结晶度（~ 50 ~ 60%）的SC晶体。研究发现，一定数量的PBAT实际上有利于立体络合过程，当PBAT含量增加30%时，挤出过程更加光滑，因此有望在工业上实现SC结晶。此外，制备的PBAT/SC共混物可以在相对较低的温度下容易地加工，理想地允许其可扩展应用。本研究为SC晶的高效制备和广泛应用提供了一种简便的方法，对制造成核剂或耐热PLA部件具有重要价值。
Herein, a feasible protocol for the rapid preparation of polylactide (PLA) stereocomplex (SC) crystallite by extrusion was shown, in which a processing temperature lower than its melting point was chosen to suppress the thermal degradation and homocrystallization of PLA. Meanwhile, flexible and biodegradable poly(butylene adipate-co-terephthalate) (PBAT) was introduced to improve the processability of solid SC crystallite. The exclusive formation of SC crystallite with high crystallinity (~ 50 to 60%) was realized without further thermal treatment, which was clearly confirmed by wide-angle X-ray diffraction and different scanning calorimeter tests. It was found that certain amount of PBAT actually facilitates the stereocomplexation process, rendering the extrusion much smooth with 30 wt% more PBAT, thus making it promising to industrially achieve SC crystallite. Furthermore, the as-prepared PBAT/SC blend could be processed easily at a relatively low temperature, desirably allowing its scalable application. This work delivers a facile method for the efficient preparation and wider application of SC crystallite, which could be of great value to fabricate nucleating agents or heat-resistant PLA parts.