壳层组分对芯壳结构竹塑复合材料热解特性的影响

摘要

以高密度聚乙烯(PE-HD)/竹屑作为芯层材料,PE-HD、PE-HD/竹浆纤维、PE-HD/纳米碳酸钙、PE-HD/白泥分别作为壳层材料,熔融共挤制备了芯壳结构竹塑复合材料,讨论了不同升温速率对芯壳结构竹塑复合材料热解行为的影响,并引入Coats和Redferm模型和Flynn-Wall-Ozawa模型量化了芯壳结构竹塑复合材料的表观活化能.结果表明,壳层中加入白泥和纳米碳酸钙可以改善芯壳结构竹塑复合材料的热稳定性,加入竹浆纤维对其热稳定性略有影响;在壳层中分别添加10％的竹浆纤维、纳米碳酸钙和白泥后,芯壳结构竹塑复合材料的表观活化能变化不显著.%This paper reported an investigation on pyrolysis characteristics of core-shell structured bamboo-plastic composites (BPC) prepared by a co-extrusion processing method.These BPC were constituted by a core layer of high-density polyethylene (PE-HD)/bamboo residue fiber composite and four types of shells including pristine PE-HD/bamboo pulp fiber composite,PE-HD/nano-CaCO3 compound and PE-HD/white mud composite.The pyrolysis characteristics of BPC were evaluated by thermogravimetric analysis at different heating rates,and their pyrolysis kinetics was analyzed by Coats-Redferm's and Flynn-Wall-Ozawa's models.The results indicated that the thermal stability of BPC was improved in the presence of PE-HD/nano-CaCO3 and PE-HD/white mud shells,however,the formation of PE-HD/bamboo pulp fiber shell exhibited few effects on their thermal stability.Moreover,the apparent activation energy of BPC presented a slight change with addition of 10 wt ％ bamboo pulp fiber,nano-CaCO3 and white mud into their shell.