氮气发泡生物基微孔聚丁二酸丁二醇酯的注射成型:工艺条件/泡沫结构/弯曲性能关系

Q2 Materials Science
N. Ykhlef, E. Lafranche
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引用次数: 8

摘要

本文旨在确定优化氮(N2)发泡注射成型聚丁二酸丁二烯(PBS)的微孔结构(细胞大小,细胞密度)的主要工艺参数,作为零件的最终弯曲性能。设计了零件梁的几何形状,以便再现大多数工业零件上出现的一些几何形状(例如厚度变化,肋,凸台或孔)。本文首次采用田口L9实验设计(DOE)来量化加工条件对微细胞结构和力学性能的影响。在工艺参数中,熔体温度、气体含量、注射体积流量和背压对气体溶解相和成核相的影响程度较大,因此选择它们作为DOE。方差分析(ANOVA)表明,在饲养阶段,微细胞结构主要取决于氮含量,而较小程度上取决于PBS/N2系统中气体压力饱和度的背压表征。所得的特定抗弯性能由皮芯比以及泡沫结构的精细度(细胞大小、细胞密度)控制,但与未发泡的部分相比,特定性能下降了15%。因此,可以通过微观结构分析来确定微孔结构/力学性能。在第二步中,通过在PBS中引入微滑石作为细胞成核剂(非均相成核)来改善泡沫微细胞结构。观察到细胞密度显著增加和细胞减少(40%)。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Injection-moulding of nitrogen-foamed bio-based microcellular poly(butylene succinate): Processing conditions/foam structure/flexural properties relationship
This paper aims to identify the main processing parameters that optimize as well the microcellular structure (cell size, cell density) of nitrogen (N2) foamed injection-moulded poly(butylene succinate) (PBS) as the resultant flexural properties of the part. The part beam geometry was designed so as to reproduce some geometrical shapes (e.g. thickness change, ribs, bosses or holes) occurring on most of industrial parts. A Taguchi L9 design of experiments (DOE) has been first used to quantify the effects of processing conditions on microcellular structure and mechanical performances. Among the processing parameters, the melt temperature, gas content, injection volumetric flow rate and back pressure were chosen for the DOE due to their level of influence on gas dissolution and nucleation phases. An analysis of variance (ANOVA) showed that the microcellular structure depended mainly on nitrogen content and, to a lesser extent, on back pressure representation of gas pressure saturation in the PBS/N2 system during the feeding stage. The resultant specific flexural properties were controlled by the skin/core ratio as well as the finesse of foam structure (cell sizes, cell density) but a 15% loss in specific performances was noted compared with the unfoamed part. The microcellular structure/mechanical performances could be thus established from the microstructure analysis. In a second step, the foamed microcellular structure has been improved by introduction of micro-talc in the PBS acting as cell nucleating agent (heterogeneous nucleation). A significant increase in cell density and cell reduction (40%) were observed.
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来源期刊
Polymers from Renewable Resources
Polymers from Renewable Resources Materials Science-Polymers and Plastics
CiteScore
3.50
自引率
0.00%
发文量
15
期刊介绍: Polymers from Renewable Resources, launched in 2010, publishes leading peer reviewed research that is focused on the development of renewable polymers and their application in the production of industrial, consumer, and medical products. The progressive decline of fossil resources, together with the ongoing increases in oil prices, has initiated an increase in the search for alternatives based on renewable resources for the production of energy. The prevalence of petroleum and carbon based chemistry for the production of organic chemical goods has generated a variety of initiatives aimed at replacing fossil sources with renewable counterparts. In particular, major efforts are being conducted in polymer science and technology to prepare macromolecular materials based on renewable resources. Also gaining momentum is the utilisation of vegetable biomass either by the separation of its components and their development or after suitable chemical modification. This journal is a valuable addition to academic, research and industrial libraries, research institutions dealing with the use of natural resources and materials science and industrial laboratories concerned with polymer science.
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