摘要
针对等规聚丙烯(iPP)韧性差,弹性体改性后降低了其结晶温度与结晶能力的问题,采用弹性体三元乙丙橡胶(EPDM)和成核剂山梨醇二缩芳香醛(NX8000K)联合改性iPP;并使用差示扫描量热仪(DSC)、X射线衍射仪(XRD)、偏光显微镜(POM)、扫描电子显微镜(SEM)和万能试验机等手段对iPP/EPDM/NX8000K三元材料的形貌结构及力学性能进行表征。结果表明:NX8000K的引入可以解决EPDM增韧iPP过程中降低其结晶能力的问题;当NX8000K质量分数为0.6%,EPDM质量分数较高(40%)时,结晶温度仍可达132.0℃,结晶度为53.5%。另外,NX8000K的引入可以高温诱导成核,促使iPP胶凝结晶,使iPP/EPDM/NX8000K三元材料的冲击强度在EPDM质量分数为30%时达到了52.4 kJ/m 2,分别是纯iPP的11.4倍和相应iPP/EPDM二元材料的2.6倍。
Isotactic polypropylene(iPP)has low toughness,and its crystallization temperature and crystallization ability often decrease after adding elastomer.Based on these,the elastomer EPDM and the nucleating agent NX8000K were used to modify iPP.Differential scanning calorimeter(DSC),X-ray diffractometer(XRD),polarizing optical microscope(POM),scanning electron microscope and universal testing machine were used to characterize the morphological structure and mechanical properties of iPP/NX8000K/EPDM ternary materials.The results show that the addition of NX8000K overcomes the problems of using EPDM to toughen iPP to reduce its crystallization ability.When the mass fractions of NX8000K and EPDM are 0.6%and 40%,respectively,the crystallization temperature still reaches 132.0℃,and the relative crystallinity is 53.5%.Moreover,the results show that due to the introduction of NX8000K,it can induce nucleation at high temperature and cause iPP to gel and crystallize.When the EPDM mass fraction is 30%,the iPP/EPDM/NX8000K impact strength reaches 52.4 kJ/m 2,which is 11.4 times of the pure iPP and 2.6 times of the corresponding iPP/EPDM binary blend.
作者
王孟轲
罗发亮
尹佳杰
李磊
金政伟
WANG Mengke;LUO Faliang;YIN Jiajie;LI Lei;JIN Zhengwei(State Key Laboratory of High-Efficiency Utilization of Coal and Green Chemical Engineering,Ningxia University,Yinchuan 750021,China;Energy Ningxia Coal Group,Yinchuan 750011,China)
出处
《石油学报（石油加工）》
EI
CAS
CSCD
北大核心
2021年第3期669-676,共8页
Acta Petrolei Sinica(Petroleum Processing Section)
基金
宁夏回族自治区重点研发项目(2019BDE03004)
宁夏高等学校一流学科建设项目及国家双一流学科建设项目(NXYLXK2017A04)
省部共建煤炭高效利用与绿色化工国家重点实验室开放课题(2019-KF-07)基金资助。
关键词
等规聚丙烯
NX8000K
EPDM
iPP结构
iPP性能
isotactic polypropylene
sorbitol aromatic aldehyde nucleating agents(NX8000K)
ethylene propylene diene monomer(EPDM)
iPP structure
iPP properties
