Flame retardancy and thermal and mechanical properties of ternary composites comprising polylactic acid, polyethylene glycol, and bamboo fiber

IF 4.1 2区化学 Q2 POLYMER SCIENCE

Polymer Pub Date : 2025-05-10 DOI:10.1016/j.polymer.2025.128533

Yu Feng , Yihong Song , Wenfeng Li , Zhenyu Guo , Zhiwei Jiang , Liuwen Ruan , Wenxi Cheng , Weiqiang Song

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Abstract

A ternary composite composed of polylactic acid (PLA), polyethylene glyco (PEG)l, and bamboo fiber (BF) at a weight ratio of 70:10:20 was prepared using a twin-screw extruder, incorporating aluminum diethylphosphinate (ADP) and melamine cyanurate (MCA). Specifically, formulations containing 30 parts ADP alone, 10 parts ADP and 10 parts MCA, or 10 parts ADP and 15 parts MCA improved the UL94 rating from V2 to V0. The corresponding values of limiting oxygen index (LOI) were 29.3 %, 25.5 %, and 26.9 %, respectively. The combination of ADP and MCA exhibited a synergistic effect on flame retardant modification of PLA/PEG/BF. Furthermore, both ADP and MCA altered the thermal behavior of the composite; MCA alone increased the melting temperature (T_m) but decreased the crystallization temperature (T_c), whereas ADP increased both T_m and T_c. The crystallization of PLA in the composite showed coexistence of two-dimensional and three-dimensional growth modes after incorporation of MCA and ADP, although their effects on the rate of PLA crystal growth differed. Composites with 30 parts ADP alone and 10 parts ADP and 10 parts MCA loading demonstrated high mass retention rates at 800 °C.

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由聚乳酸、聚乙二醇和竹纤维组成的三元复合材料的阻燃性和热机械性能

采用双螺杆挤出机，以磷酸二乙酯铝（ADP）和三聚氰胺氰脲酸酯（MCA）为原料，制备了重量比为70:10:20的聚乳酸（PLA）、聚乙二醇（PEG）l和竹纤维（BF）三元复合材料。具体来说，仅含有30份ADP， 10份ADP和10份MCA，或10份ADP和15份MCA的配方将UL94等级从V2提高到V0。相应的极限氧指数（LOI）分别为29.3%、25.5%和26.9%。ADP和MCA对PLA/PEG/BF的阻燃改性具有协同增效作用。此外，ADP和MCA都改变了复合材料的热行为；单独添加MCA提高了熔点温度（Tm），降低了结晶温度（Tc），而ADP提高了结晶温度（Tm）和结晶温度（Tc）。加入MCA和ADP后，PLA在复合材料中的结晶表现为二维和三维生长模式共存，尽管它们对PLA晶体生长速率的影响不同。单独加载30份ADP和10份ADP + 10份MCA的复合材料在800°C时具有较高的质量保持率。

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来源期刊

Polymer 化学-高分子科学

CiteScore

7.90

自引率

8.70%

发文量

959

审稿时长

32 days

期刊介绍： Polymer is an interdisciplinary journal dedicated to publishing innovative and significant advances in Polymer Physics, Chemistry and Technology. We welcome submissions on polymer hybrids, nanocomposites, characterisation and self-assembly. Polymer also publishes work on the technological application of polymers in energy and optoelectronics. The main scope is covered but not limited to the following core areas: Polymer Materials Nanocomposites and hybrid nanomaterials Polymer blends, films, fibres, networks and porous materials Physical Characterization Characterisation, modelling and simulation* of molecular and materials properties in bulk, solution, and thin films Polymer Engineering Advanced multiscale processing methods Polymer Synthesis, Modification and Self-assembly Including designer polymer architectures, mechanisms and kinetics, and supramolecular polymerization Technological Applications Polymers for energy generation and storage Polymer membranes for separation technology Polymers for opto- and microelectronics.