摘要
以氢氧化钠为催化剂,N-乙酰己内酰胺为活化剂,通过阴离子原位聚合法制备浇铸尼龙6(MCPA6)/气相Si O2复合材料,并利用扫描电子显微镜、差示扫描量热、热重分析、力学性能测试等方法研究了气相Si O2用量对复合材料的微观形态、结晶性能、吸水率、热稳定性能及拉伸和冲击性能的影响。结果表明,经硅烷偶联剂(KH550)处理的气相Si O2能均匀分布在MCPA6中;气相Si O2可促进MCPA6的结晶,降低吸水率,当气相Si O2用量为己内酰胺质量的0.5%时,复合材料的吸水率最低,比MCPA6降低16%;复合材料的热稳定性提高,当气相Si O2用量为己内酰胺质量的2.5%时,复合材料起始分解温度和失重速率最大时分解温度分别比MCPA6提高98.8℃和38℃;随着气相Si O2用量增加,复合材料的拉伸和冲击性能均呈先升高后降低的趋势,当气相Si O2用量为己内酰胺质量的0.5%时,拉伸强度、断裂伸长率及缺口冲击强度较MCPA6分别提高10%,6%和81%。
MCPA6 / fumed silica composites were prepared via in situ anionic ring-opening polymerization with sodium hydroxide as catalyst and N-acetylcaprolactam as activator. The microcosmic morphology, crystalline characteristic, water absorption, thermostability, tensile and impact properties of the composites were studied by means of SEM, DSC, TG and mechanical properties. The results indicate that the fumed silica treated by silane coupling agent （KH550） is homogeneously dispersed in MCPA6 matrix. The addition of the finned silica can facilitate crystallization of MCPA6 matrix and decrease the water absorption, when the content of the fumed silica is 0.5% of caprolactam mass, the water absorption of the composite is lowest and decreases by 16%. Thermostability of the composites is also improved, as the initial decomposition temperature and the maximum decomposition temperature of the composites is 98.8 ℃ and 38 ℃ higher than MCPA6 respectively when the content of the fumed silica is 2.5% of caprolactam mass. Tensile and impact properties of the composites increase firstly and then decrease with the increase of the fumed silica content, when the content of the fumed silica is 0.5% of caprolactam mass, the tensile strength, elongation at break and notched impact strength increases by 10%, 6%oand 81% separately compared with MCPA6.
出处
《工程塑料应用》
CAS
CSCD
北大核心
2015年第5期34-37,共4页
Engineering Plastics Application
