Superior Performance of Fully Biobased Poly(lactide) via Stereocomplexation-Induced Phase Separation: Structure versus Property

Superior Performance of Fully Biobased Poly(lactide) via Stereocomplexation-Induced Phase Separation: Structure versus Property
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通过立体络合诱导相分离实现全生物基聚丙交酯的卓越性能:结构与性能

DOI:
10.1021/acssuschemeng.5b00208
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发表时间:
2015-06
影响因子:
8.4
通讯作者:
Chen, Mingqing
Chen, Mingqing
中科院分区:
化学1区
文献类型:
--
作者:
Xu, Pengwu;Dong, Weifu;Lemstra, Piet J.;Chen, Mingqing

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在不添加任何外部改性剂的情况下,完全生物基聚乳酸(PLA)同时获得了高强度、高韧性和高透明度等优越性能。结构/形态研究很好地解释了性能的改善。采用不对称聚l-丙交酯(l-丙交酯)/聚d-丙交酯(PLLA/PDLA)共混物在200℃下熔融复配得到立体配合物PLA (SC-PLA),并通过广角x射线衍射(WAXD)和差示扫描量热(DSC)分析进行了证实。SC-PLA结构域(d = 950-1200 nm)导致PLLA矩阵中的物理交联网络。流变学和Molau实验结果表明,SC-PLA含量增加时,SC-PLA结构域的连接由链缠结变为直接分子桥接。SC-PLA晶体和交联网络增强了PLLA基体,从而提高了熔体粘度、模量和屈服强度。令人惊讶的是,断裂伸长率…
Superior properties such as high strength, toughness and transparency of fully biobased poly(lactide) (PLA) were achieved simultaneously without any external modifiers. The improvement in properties is well explained by a structural/morphological study. Stereocomplex PLA (SC-PLA) was obtained by melt compounding asymmetric poly(l-lactide)/poly(d-lactide) (PLLA/PDLA) blends at 200 °C and confirmed by wide-angle X-ray diffraction (WAXD) and differential scanning calorimetry (DSC) analyses. The SC-PLA domains (d = 950–1200 nm) lead to a physical cross-link network in the PLLA matrix. Rheology and Molau experiment reveal two different microstructures as a function of SC-PLA content, i.e., the connection of SC-PLA domains varied from chain entanglement to direct molecular bridging when the SC-PLA content increased from 10% to 23%. The SC-PLA crystals and the cross-link network reinforced the PLLA matrix, resulting in increases in melt viscosity, modulus and yield strength. Surprisingly, the elongation at break...
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