Švab Iztok, Pustak Anđela, Denac Matjaž, Sever Škapin Andrijana, Leskovac Mirela, Musil Vojko, Šmit Ivan
Acta Chim Slov. 2018 Jun;65(2):344-353. doi: 10.17344/acsi.2017.4026.
The effects of two metallocene ethylene-propylene-based elastomers (m-EPR1 and m-EPR2) differing in molecular mass and viscosity on mechanical, rheological and interfacial properties were compared. The m-EPR elastomers were added to iPP in 2.5, 5, 10, 15, and 20 vol.%. Torque values, elongation at break and impact strength measured of the iPP/m-EPR1 blends were higher than the iPP/m-EPR2 blends due to higher molten viscosity of m-EPR1 than m-EPR2 copolymer. Slight differences in Young moduli as well as in tensile strength at yield and at break might indicate that tensile properties of iPP/m-EPR blends were not significantly affected by difference in viscosity or molecular mass, miscibility and spherulite size. Optimization diagrams indicated the metallocene m-EPR copolymers are efficient impact modifiers for polypropylene and showed good balancing of mechanical properties in iPP/m-EPR blends.
比较了两种分子量和粘度不同的茂金属乙烯-丙烯基弹性体（m-EPR1和m-EPR2）对机械、流变和界面性能的影响。将m-EPR弹性体以2.5、5、10、15和20体积%的比例添加到等规聚丙烯（iPP）中。由于m-EPR1的熔融粘度高于m-EPR2共聚物，iPP/m-EPR1共混物的扭矩值、断裂伸长率和冲击强度高于iPP/m-EPR2共混物。杨氏模量以及屈服和断裂拉伸强度的细微差异可能表明，iPP/m-EPR共混物的拉伸性能不受粘度或分子量、混溶性和球晶尺寸差异的显著影响。优化图表明，茂金属m-EPR共聚物是聚丙烯的有效抗冲改性剂，并且在iPP/m-EPR共混物中显示出良好的机械性能平衡。
