Thermomechanical properties of highly transparent self-reinforced polylactide composites with electrospun stereocomplex polylactide nanofibers
Thermomechanical properties of highly transparent self-reinforced polylactide composites with electrospun stereocomplex polylactide nanofibers
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DOI：
10.1016/j.polymer.2018.08.018
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发表时间：
2018-09-26
期刊：
影响因子：
4.6
通讯作者：
Hotta, Atsushi
中科院分区：
文献类型：
--
作者：
Kurokawa, Naruki;Hotta, Atsushi
以7 wt%聚乳酸溶液为溶剂，在二氯甲烷和吡啶的混合溶剂中，采用电导率控制的静电纺丝法制备了平均直径为367nm的立体配合物聚乳酸（sc-PLA）纳米纤维。将sc-PLA纳米纤维作为聚l -丙交酯（PLLA）的增强材料，制备自增强PLA复合材料，并通过模压成型将其复合到PLLA中。对制备的自增强PLA复合材料的热力学和光学性能进行了研究。结果表明，当sc-PLA纤维浓度为15 wt%时，可获得高度透明（75%以上）的自增强PLA复合材料。此外，在较高的橡胶态温度下，添加sc-PLA纳米纤维可以提高复合材料的存储模量。当纤维浓度为15 wt%时，复合材料的存储模量为70 MPa，是原始纯PLLA的24.1倍。由此可见，成功制备了具有高透明度和高热机械性能的自增强PLA复合材料。
Stereocomplex polylactide (sc-PLA) nanofibers with the average diameter of 367 nm were prepared by the conductivity-controlled electrospinning using 7 wt% PLA solution in the mixed solvents of dichloromethane and pyridine. The sc-PLA nanofibers were used as reinforcement materials for poly(L-lactide) (PLLA) to fabricate a self-reinforced PLA composite, while the fibers were compounded into the PLLA by compression molding. Thermomechanical and optical properties of the resulting self-reinforced PLA composites were investigated. It was found that highly transparent (above 75%) self-reinforced PLA composites were obtained up to the sc-PLA fiber concentration of 15 wt%. Also, at higher temperature in the rubbery state, the storage moduli of the composites increased by adding sc-PLA nanofibers. At the fiber concentration of 15 wt%, the storage modulus of the composite became 70 MPa, which was 24.1 times higher than that of the original pure PLLA. It was therefore concluded that the self-reinforced PLA composite with high transparency and high thermomechanical properties was successfully obtained.