MCPA6/埃洛石纳米管复合材料性能研究

以氢氧化钠为催化剂,N–乙酰己内酰胺为活化剂,原位聚合制备MCPA6/埃洛石纳米管(MCPA6/HNT)复合材料,并利用凝胶渗透色谱、场发射扫描电子显微镜、差示扫描量热、热重分析和力学性能测试等方法研究HNT用量对复合材料结构和性能的影响。结果表明,HNT的引入使得PA6的分子量下降,分子量分布变宽;经硅烷偶联剂(KH–550)处理后的HNT能均匀分布在MCPA6中,且与基体具有较好的界面性能;HNT可以明显提高复合材料的结晶速率、结晶度以及分解温度;随着HNT含量增加,体系的拉伸强度和缺口冲击强度呈先增大后减小的趋势,而断裂伸长率逐渐下降,当HNT含量为1.5%时,MCPA6/HNT的综合力学性能最佳,拉伸强度和缺口冲击强度分别较MCPA6提高21.3%和14.9%。

Study on Properties of Monomer Casting Polyamide 6/Halloysite Nanotube Composites

Monomer casting polyamide 6 (MCPA6)/halloysite nanotube (HNT) composites were prepared via in situ polymerization with sodium hydroxide as catalyst and N-acetylcaprolactam as activator. The effects of HNT content on structure and properties of composites were studied by means of gel permeation chromatography,field emission scanning electron microscopy, differential scanning calorimetry,thermogravimetic analysis and mechanical properties test. The results indicate that the decreased relative molecular weight and broaden molecular weight distribution are caused by incorporation of HNT. HNT treated by silane coupling agent (KH550) is homogeneously dispersed in MCPA6 matrix and exhibite good interface performance with MCPA6. The crystallization rate,degree of crystallinity and decomposition temperature are improved due to the addition of HNT. With the increase of HNT content,the tensile strength and notched impact strength increase firstly and then decrease,whereas the elongation at break decrease gradually. When the the content of HNT come up to 1.5%,MCPA6/HNT composites achieve the best comprehensive properties,the tensile strength and notched impact strength are increased by 21.3%and 14.9%separately compared with MCPA6.