微注塑聚丙烯/埃洛石纳米管复合材料制品的结构和性能  

STRUCTURE AND PROPERTIES OF PP /HNT NANOCOMPOSITE PARTS PREPARED BY MICRO-INJECTION MOLDING

作　　者：黄汉雄[1] 吴泽[1] 关伟盛[1] 汪斌[1] 

机构地区：[1]华南理工大学塑料橡胶装备及智能化研究中心聚合物成型加工工程教育部重点实验室,广州510640

出　　处：《高分子学报》2013年第12期1514-1519,共6页Acta Polymerica Sinica

基　　金：高等学校博士学科点专项科研基金(基金号20120172110001)资助

摘　　要：采用微注塑(MIM)分别成型厚度为0.7 mm的聚丙烯(PP)制品及其与埃洛石纳米管(HNT)的复合材料制品(μ-PP和μ-PP/HNT),采用普通注塑(CIM)成型厚度为3.5 mm的PP制品(m-PP),研究了制品力学性能与晶体结构之间的关系以及HNT对制品力学性能和热稳定性的影响.结果表明,与m-PP制品相比,μ-PP制品的拉伸强度和储能模量(40℃)分别提高67%和48%,这是由于μ-PP制品的结晶度(76.7%)和剪切层厚度(占制品半壁厚的57.8%)明显较高所致.少量(2 phr)HNT的加入可进一步提高μ-PP制品的拉伸强度、储能模量和热稳定性,这主要得益于HNT能均匀分散于PP基体中.虽然μ-PP和μ-PP/HNT制品β晶含量(20.0%和26.3%)显著高于m-PP制品β晶含量(8.5%),但前两种制品的断裂伸长率却明显较低,这表明该2种制品中因分子链取向所致的韧性降低效应明显强于β晶的增韧效应.Polypropylene（ PP） and PP /halloysite nanotube nanocomposite parts of 0. 7 mm thickness（ μ-PP and μ-PP / HNT） were molded via micro-injection molding（ MIM）,and PP part of 3. 5 mm thickness（ m-PP）was molded via conventional injection molding（ CIM）. The relationship between mechanical properties and crystal structures and the influence of HNT on mechanical properties and thermal stability of the molded parts were investigated. Compared with the m-PP part,the tensile strength and storage modulus（ 40 ℃） of μ-PP part were increased by 67% and 48%,respectively,due to its significantly higher crystallinity（ 76. 7%） and shear layer thickness percentage（ 57. 8%）. The addition of a low content（ 2 phr） of HNT further increased the tensile strength,storage modulus and thermal stability of μ-PP parts. This was mainly ascribed to the good dispersion of HNT in PP matrix. Although the contents of β crystal in both μ-PP and μ-PP / HNT parts（ 20%and 26. 3%） were significantly higher than those of m-PP part,the elongations at break of the former two parts were obviously lower than those of the latter one. This indicated that the effect of toughness decrease caused by molecular orientation was stronger than the toughening effect of the β crystal for both μ-PP and μ-PP / HNT parts.

关 键 词：微注塑 埃洛石纳米管 结晶形态 力学性能 热稳定性 

分 类 号：TB332[一般工业技术—材料科学与工程]