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

Han-xiong Huang; Ze Wu; Wei-sheng Guan; Bin Wang

doi:10.3724/SP.J.1105.2013.13116

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

Research Article | 更新时间：2021-03-19

- STRUCTURE AND PROPERTIES OF PP/HNT NANOCOMPOSITE PARTS PREPARED BY MICRO-INJECTION MOLDING
- Acta Polymerica Sinica Issue 12, Pages: 1514-1519(2013)
- 作者机构：
  
  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
- 作者简介：
- 基金信息：
- DOI：10.3724/SP.J.1105.2013.13116
  CLC：
- Published：20 December 2013，
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Han-xiong Huang, Ze Wu, Wei-sheng Guan, Bin Wang. STRUCTURE AND PROPERTIES OF PP/HNT NANOCOMPOSITE PARTS PREPARED BY MICRO-INJECTION MOLDING. [J]. Acta Polymerica Sinica (12):1514-1519(2013)
DOI：

Han-xiong Huang, Ze Wu, Wei-sheng Guan, Bin Wang. STRUCTURE AND PROPERTIES OF PP/HNT NANOCOMPOSITE PARTS PREPARED BY MICRO-INJECTION MOLDING. [J]. Acta Polymerica Sinica (12):1514-1519(2013) DOI： 10.3724/SP.J.1105.2013.13116.

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（-PP和-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，-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-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-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-PP和-PP/HNT制品晶含量（20.0%和26.3%）显著高于m-PP制品晶含量（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晶的增韧效应.

Abstract

Polypropylene (PP) and PP/halloysite nanotube nanocomposite parts of 0.7 mm thickness (-PP and -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 -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 -PP parts.This was mainly ascribed to the good dispersion of HNT in PP matrix.Although the contents of crystal in both -PP and -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 crystal for both -PP and -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

Keywords

Micro-injection moldingHalloysite nanotube (HNT)Crystal morphologyMechanical propertyThermal stability

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National Engineering Research Center for Advanced Polymer Processing Technology, Zhengzhou University

State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, Center for Advanced Low-dimension Materials, College of Materials Science and Engineering, Donghua University

Institute for Advanced Study, Chengdu University

Yangtze Delta Region Institute (Huzhou), University of Electronic Science and Technology of China

Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China

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