摘要
利用正庚酸、硬脂酸、环己基甲酸和苯甲酸对氧化铝纳米粒子表面进行化学改性,研究了改性粒子表面的基团结构以及接枝量对其在聚丙烯(iPP)基体中成核效果的影响。结果表明:与直链烷基和环烷基羧酸相比,苯甲酸改性颗粒(BA-Al2O3)具有优异的成核效果,当BA-Al2O3的添加量为0.1%(质量)时,成核聚丙烯的结晶温度和弯曲模量相对于纯iPP分别提高了9.4℃和21.9%。改性纳米颗粒BA-Al2O3的苯甲酸接枝量对复合材料的结晶温度和力学性能也有重要影响,接枝量小于1.3mmol/(gAl2O3)时,BA-Al2O3的成核效果随接枝量增加而显著增加;接枝量大于1.3mmol/(gAl2O3)时,成核效果略微增加。所以,通过调控改性颗粒的表面结构,可以有效提升iPP复合材料的结晶和力学性能。
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.
作者
蒋晓峰
赵世成
辛忠
JIANG Xiaofeng;ZHAO Shicheng;XIN Zhong(State Key Laboratory of Chemical Engineering,School of Chemical Engineering,East China University of Science and Technology,Shanghai 200237,China)
出处
《化工学报》
EI
CAS
CSCD
北大核心
2019年第10期4052-4061,共10页
CIESC Journal
基金
国家自然科学基金项目(21878089)
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
nanoparticles
synthesis
organic structures
grafting yield
polypropylene
composites
nucleation
