同时增强聚(L-内酰胺)/聚(D-内酰胺)/碳纤维复合材料的机械、流变、耐热和热/电特性

IF 4.7 3区 工程技术 Q2 ENGINEERING, ENVIRONMENTAL
Yujie Jin, Haopeng Wang, Hongda Cheng, Yi Li, Huan Wang, Changyu Han
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引用次数: 0

摘要

本研究通过简单的熔融混合制备了不同 PDLA 含量的聚(L-内酰胺)(PLLA)/聚(D-内酰胺)(PDLA)/碳纤维(CF)复合材料。在原位形成了立体复合体(SC)结晶。研究了 CF 和 SC 结晶对复合材料形态、结晶、流变行为、机械性能、耐热性、导热性和导电性的影响。SC晶粒作为PLLA的成核剂,可加速PLLA的结晶,提高结晶度,细化球形晶体,从而使CFs的分散更均匀、更致密。对于含有 10 wt% PDLA 的 PLLA/PDLA/CF 复合材料,由于 CFs 和 SC 结晶的协同作用,其软化温度(VST)比纯 PLLA 提高了约 100 ℃。热导率从纯聚乳酸的 0.21 W (mK)-1 提高到 0.47 W (mK)-1,表面电阻率也显著降低了约 8 个数量级。更重要的是,与纯聚乳酸相比,10 wt % PDLA 复合材料的拉伸模量和强度分别提高了 156% 和 29.2%。添加 CFs 和 PDLA 后,熔体粘度和弹性也得到了显著改善。可降解复合材料的机械性能、流变性能、耐热性、导热性和导电性都得到了不同寻常的改善,满足了更广泛的聚乳酸应用所需的性能。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Simultaneous Enhancement of Mechanical, Rheological, Heat Resistance, and Thermal/Electrical Properties of Poly(L-lactide)/Poly(D-lactide)/Carbon Fibers Composites

Simultaneous Enhancement of Mechanical, Rheological, Heat Resistance, and Thermal/Electrical Properties of Poly(L-lactide)/Poly(D-lactide)/Carbon Fibers Composites

Simultaneous Enhancement of Mechanical, Rheological, Heat Resistance, and Thermal/Electrical Properties of Poly(L-lactide)/Poly(D-lactide)/Carbon Fibers Composites

In this work, poly(L-lactide) (PLLA)/poly(D-lactide) (PDLA)/carbon fiber (CF) composites with different PDLA content were prepared by simple melt blending. The stereocomplex (SC) crystallites were in situ formed. The effects of CFs and SC crystallites on the morphology, crystallization, rheological behaviors, mechanical properties, heat resistance, thermal and electrical conductivity of composites were investigated. The SC crystallites acted as nucleating agents of PLLA to accelerate the crystallization of PLLA, improve the degree of crystallinity, and refine spherical crystals, which led to a more homogeneous and dense dispersion of CFs. For the PLLA/PDLA/CF composite with 10 wt% PDLA, attributing to the synergistic effect of CFs and SC crystallites, vicat softening temperature (VST) was increased by about 100 ℃ over neat PLLA. The thermal conductivity increased from 0.21 W (mK)−1 of neat PLLA to 0.47 W (mK)−1, and surface resistivity decreased dramatically by about 8 orders of magnitude. More importantly, an increases of 156% and 29.2% were achieved in the tensile modulus and strength of composite with 10 wt % PDLA compared to neat PLLA. Melt viscosity and elasticity were also significantly improved with the addition of CFs and PDLA. The unusual combination of the improved mechanical and rheological performances, thermal resistance, thermal and electrical conductivity established in the degradable composites meets the properties required for a wider range of PLLA applications.

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来源期刊
Journal of Polymers and the Environment
Journal of Polymers and the Environment 工程技术-高分子科学
CiteScore
9.50
自引率
7.50%
发文量
297
审稿时长
9 months
期刊介绍: The Journal of Polymers and the Environment fills the need for an international forum in this diverse and rapidly expanding field. The journal serves a crucial role for the publication of information from a wide range of disciplines and is a central outlet for the publication of high-quality peer-reviewed original papers, review articles and short communications. The journal is intentionally interdisciplinary in regard to contributions and covers the following subjects - polymers, environmentally degradable polymers, and degradation pathways: biological, photochemical, oxidative and hydrolytic; new environmental materials: derived by chemical and biosynthetic routes; environmental blends and composites; developments in processing and reactive processing of environmental polymers; characterization of environmental materials: mechanical, physical, thermal, rheological, morphological, and others; recyclable polymers and plastics recycling environmental testing: in-laboratory simulations, outdoor exposures, and standardization of methodologies; environmental fate: end products and intermediates of biodegradation; microbiology and enzymology of polymer biodegradation; solid-waste management and public legislation specific to environmental polymers; and other related topics.
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