化工学报2019，Vol.70Issue(10)：4052-4061,10.DOI:10.11949/0438-1157.20190578
有机羧酸改性氧化铝纳米颗粒在聚丙烯中的成核效果研究
Nucleation effect of carboxylic acid modified alumina nanoparticles on polypropylene
摘要
Abstract
A series of modified alumina (Al2O3) nanoparticles (NPs) were synthesized by grafting heptanoic acid, stearic acid, cyclohexanecarboxylic acid and benzoic acid onto Al2O3 NPs. The effect of organic structures and grafting yield on the nucleation effect of modified NPs in isotactic polypropylene (iPP) matrix was investigated. The results show that the benzoic acid modified particles (BA-Al2O3) have excellent nucleation effect compared with linear alkyl and cycloalkyl carboxylic acids. The crystallization temperature and flexural modulus of nucleated iPP with 0.1% (mass) BA-Al2O3 increase by 9.4℃ and 21.9% compared with that of virgin iPP, respectively. The crystallization temperature and mechanical properties of composites are heavily affected by the grafting yield of the benzoic acid on the modified NPs BA-Al2O3. When the grafting yield is smaller than 1.3 mmol/(g Al2O3), the nucleation effect of BA-Al2O3 increases significantly with increasing grafting yield; however, when the grafting yield is higher than 1.3 mmol/(g Al2O3), the nucleation effect increases slightly. By regulating the surface structures of modified NPs, it can effectively improve the crystallization behavior and mechanical properties of iPP.关键词
纳米粒子/合成/基团结构/接枝量/聚丙烯/复合材料/成核Key words
nanoparticles/synthesis/organic structures/grafting yield/polypropylene/composites/nucleation分类
化学化工引用本文复制引用
蒋晓峰,赵世成,辛忠..有机羧酸改性氧化铝纳米颗粒在聚丙烯中的成核效果研究[J].化工学报,2019,70(10):4052-4061,10.基金项目
国家自然科学基金项目(21878089) （21878089）
