熔喷用麦饭石/聚乳酸共混材料的制备及其性能

摘要/Abstract

摘要： 为了探究熔喷用麦饭石/聚乳酸共混材料的结构与可加工性，采用三乙氧基甲基硅烷（Methyltriethoxysilane，MTES）对麦饭石（Medical stone，MS）进行表面改性，并以改性麦饭石（MTES-MS）为填料，以聚乳酸（Polylactic acid，PLA）为基体，通过熔融共混工艺制备出不同质量比的MTES-MS/PLA共混材料。通过对共混材料的截面形态、结晶结构、热稳定性和力学性能等进行表征和分析。结果表明：MTES-MS与PLA基体有良好的界面相容性；MTES-MS的加入对PLA的玻璃化转变温度和结晶结构的影响不大，但会使其结晶度和热稳定性有所上升；随着MTES-MS质量分数的增加，在同一温度下，共混材料的熔体流动速率（Melt flow rate，MFR）随之降低，流动性变差，但仍满足熔喷可纺性的要求；而MTES-MS/PLA共混材料的纵向拉伸强度和断裂伸长率先增大后减小，当MTES-MS的质量分数为7%时，共混材料的力学性能较优，相比于纯PLA，共混材料的纵向拉伸强度提升了76.17%，纵向断裂伸长率提升了70.79%。

关键词: 熔喷材料, 聚乳酸, 麦饭石, 熔融共混, 生物可降解

Abstract: In order to explore the structure and processibility of medical stone/polylactic acid blends of melt-blown nonwoven, the methyltriethoxysilane (MTES) was first used to modify the surface of medical stone (MS) for the improvement of the interfacial interaction between MS and polylactic acid (PLA). Then MS was mixed with PLA by the melt blending method. The cross-section morphology, crystal structure, thermal stability and mechanical properties of the blends were characterized and analyzed. The results showed that MTES-MS had good interfacial compatibility with PLA matrix. The addition of MTES-MS had little effect on the glass transition temperature and crystallization structure of PLA. However, compared with pure PLA, the crystallinity and thermal stability of MTES-MS/PLA blends increased. With the increasing of the content of MTES-MS, under the same temperature condition, the melt flow rate (MFR) of the blends decreased and the fluidity became worse, but still met the spinnability requirements of melt-blown processing. The longitudinal tensile strength and elongation at break of MTES-MS/ PLA first increased and then decreased when MTES-MS was added. When the content of MTES-MS was 7%, the mechanical properties of the blends were optimal. Compared with pure PLA, the longitudinal tensile strength of the blends increased by 76.17% and the longitudinal elongation at break increased by 70.79%.

Key words: melt-blown materials, polylactic acid, medical stone, melt blending, biodegradable

中图分类号:

TB332

刘鹏, 于斌, 孙辉, 杨潇东. 熔喷用麦饭石/聚乳酸共混材料的制备及其性能[J]. 现代纺织技术, 2023, 31(3): 128-136.

LIU Peng, YU Bin, SUN Hui, YANG Xiaodong. Preparation and properties of medical stone/polylactic acid blends for the fabrication of melt-blown nonwoven[J]. Advanced Textile Technology, 2023, 31(3): 128-136.

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