摘要
将聚酰胺6(PA6)、三元乙丙橡胶/三元乙丙橡胶接枝马来酸酐(EPDM/EPDM-g-MAH)弹性体和有机蒙脱土(OMMT)共混,制备了PA6/弹性体/OMMT三元复合材料,并研究了该复合材料的力学性能。结果表明:当OMMT用量为2%时,PA6分子插层进入到OMMT片层中,当OMMT用量增至5%时则得到剥离型复合材料;随着OMMT用量的增加,PA6/弹性体/OMMT复合材料的冲击强度先增大后减小,其中当OMMT用量为2%时,复合材料的冲击强度达到54.29 kJ/m2,是纯PA6冲击强度(4.15 kJ/m2)的13.08倍;随OMMT用量的增加,复合材料的拉伸强度、弯曲强度和弯曲模量均逐渐增大,而断裂伸长率则随着OMMT用量的增加呈先增大后减小的趋势,并且在OMMT用量为2%时出现最大值。另外当OMMT用量较少时(低于5%),其对弹性体粒径的影响不大,此时弹性体粒径较小;而当OMMT用量超过5%时,OMMT进入弹性体中并形成了核壳结构,增加了弹性体的模量和粒径,从而使复合材料的冲击韧性降低。
Using polyamide 6（PA6）,ethylene propylene diene monomer/maleic anhydride grafted ethylene propylene diene monomer（EPDM/EPDM-g-MAH） elastomer and organic montmorillonite（OMMT） as raw materials,the PA6/elastomer/OMMT ternary composites were prepared by melt blending,and mechanical properties of the composites were studied.The results show that when OMMT content is 2%,the PA6 molecules can be intercalated into the OMMT layers,while the exfoliated composites can be obtained when OMMT content is 5%.With the increase of OMMT content,the impact strength of PA6/elastomer/OMMT composites increases first and then decreases,and the impact strength of the composites can reach 54.29 kJ/m2 when OMMT content is 2%,which is 13.08 times than that of pure PA6（4.15 kJ/m2）.The tensile and flexural strength,flexural modulus of the composites increase with the increasing of OMMT content,while the elongation at break increases first and then decreases with the increasing of OMMT content,and reaching a maximum value when the OMMT content is 2%.Moreover,the addition of OMMT has little effect on diameter of elastomer particles when OMMT content is less than 5%,and the diameter of elastomer particles is small; when the OMMT content exceeds 5%,the OMMT layers can be dispersed into the elastomer,and a core-shell structure is formed,resulting in the increase of modulus and particle diameter of elastomer,and leading to the decrease of impact strength finally.
出处
《塑料科技》
CAS
北大核心
2014年第10期30-34,共5页
Plastics Science and Technology
基金
山西省科技攻关项目(20110321052)
关键词
聚酰胺6
弹性体
蒙脱土
力学性能
微观结构
PA6
Elastomer
Montmorillonite
Mechanical properties
Microstructure
