Low-temperature sintering of stereocomplex-type polylactide nascent powder: The role of optical purity in directing the chain interdiffusion and cocrystallization across the particle interfaces
Low-temperature sintering of stereocomplex-type polylactide nascent powder: The role of optical purity in directing the chain interdiffusion and cocrystallization across the particle interfaces
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立体络合物型聚丙交酯初生粉末的低温烧结：光学纯度在引导链相互扩散和跨颗粒界面共结晶中的作用
DOI：
10.1016/j.polymer.2018.07.028
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发表时间：
2018-08
期刊：
影响因子：
4.6
通讯作者：
Fu Qiang
中科院分区：
文献类型：
--
作者：
Bai Dongyu;Diao Xingyuan;Ju Yilong;Liu Huili;Bai Hongwei;Zhang Qin;Fu Qiang
Recently, we proposed a novel strategy for fabricating high-performance stereocomplex-type polylactide (SC-PLA) products through low-temperature (180–210 °C, lower than the melting temperature of SC crystallites) sintering from its nascent powder, without serious thermal degradation involved in the conventional melt processing at higher temperatures. During the sintering, some poly(l-lactide) (PLLA) and poly(d-lactide) (PDLA) chains from adjacent powdery particles can interdiffuse across the interfaces and subsequently co-crystallize into new SC crystallites capable of welding the interfaces. The interfacial strength is dominated by the content of the newly-formed SC crystallites, however, the fast cocrystallization of PLLA/PDLA chains could hinder their sufficient interdiffusion at the interfaces and thus only limited interface-localized SC crystallites could be formed. In this work, we attempt to substantially promote the chain interdiffusion via depressing the cocrystallization rate. To do this, SC-PLA nascent powders with different optical purities of the lactate units were prepared, and the role of optical purity in directing the chain interdiffusion and cocrystallization has been investigated. Very interestingly, we demonstrate that decreasing optical purity (from 99.5 to 96%) is favorable for the formation of numerous SC crystallites at the interfaces because the lowering of cocrystallization rate enables more PLLA/PDLA chains to interdiffuse sufficiently before their cocrystallization. As a result, SC-PLA products with superior heat resistance have been fabricated by the sintering of low-optical-purity SC-PLA powder. These fascinating findings could not only provide new understanding on the low-temperature sintering mechanism of SC-PLA powders but also greatly expand the possibilities for the fabrication of SC-PLA products with superb properties.
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影响因子：
5.5
作者：
Hiroharu Ajiro;Yi-Ju Hsiao;H. Tran;Tomoko Fujiwara;M. Akashi
通讯作者：
Hiroharu Ajiro;Yi-Ju Hsiao;H. Tran;Tomoko Fujiwara;M. Akashi
影响因子：
5.5
作者：
Deplancke, Tiana;Lame, Olivier;Vigier, Gerard
通讯作者：
Vigier, Gerard
通过在离子液体中凝胶化增强高分子量聚丙交酯的立体复合物形成
影响因子：
3.2
作者：
Jie Zhu;Bing Na;Ruihua Lv;Chun Li
通讯作者：
Chun Li
聚（L-丙交酯）/聚（D-丙交酯）共混物中有机成核剂的过冷依赖性形态演化
影响因子：
3.1
作者：
Shen Sen-Qi;Bao Rui-Ying;Liu Zheng-Ying;Yang Wei;Xie Bang-Hu;Yang Ming-Bo
通讯作者：
Yang Ming-Bo
影响因子：
4.6
作者：
H. Urayama;T. Kanamori;K. Fukushima;Y. Kimura
通讯作者：
H. Urayama;T. Kanamori;K. Fukushima;Y. Kimura