Effect Of Talc On The Static And Dynamic Mechanical Properties And Microstructure Of Cis-1,4-polyisoprene

Cis-1,4-polyisoprene(CPI)is widely used in mechanical seals,medical and health care,and structural vibration damping because of its good acid resistance and high flexibility.In practical applications,CPI needs to be filled and reinforced to improve its mechanical properties.Talc,as a common filler material,has excellent properties such as low price,easy processing and chemical stability.It is important to study its influence on the mechanical properties and microstructure of CPI for the design and development of CPI products.In this paper,cis-1,4-polyisoprene blends with three talc mass fractions(27%,45%,and 58%)were investigated,and static tensile/compression and dynamic tensile/compression experiments were carried out on the blends using an electronic universal material testing machine,a high-speed tensile tester,and a detached Hopkinson compression bar experimental device.The effects of talc content on the static and dynamic mechanical properties of cis-1,4-polyisoprene were analyzed.The results showed that under static tensile/compression and dynamic tensile/compression loading,the three blends with different mass fractions of talc exhibited strain-rate strengthening effects,and the stress values increased with increasing talc content when the strain rates and strain values were the same.Under static compression,dynamic compression and dynamic tensile loading,the peak stresses all increased with the increase of talc mass fraction.The higher the content of talc,the lower the peak stress and elongation at break of the blended material under static tensile loading.The effects of talc content on the microstructure of cis-1,4-polyisoprene were analyzed by microscopic characterization using Fourier infrared spectroscopy,X-ray diffractometer and scanning electron microscopy,and the relationship between mechanical properties and microstructure was investigated.The results showed that the higher the mass fraction of talc powder,the higher the crystallinity of the blended material and the higher the stress value of the material.The content of magnesium,silicon and oxygen elements inside the blended material increases with the increase of talc mass fraction,and the higher the talc content,the poorer the dispersion of talc particles and the more dense the distribution of the three elements will be.As the mass fraction of talc powder increases,the content of carbon elements in the co-mingled material decreases,while the distribution of carbon elements does not change significantly.The higher the mass fraction of talc,the more pores inside the blended material,the rougher the liquid nitrogen brittle section and tensile section,the more serious the talc agglomeration and precipitation phenomenon,which will easily lead to the fracture of the blended material.The research results can provide data support and methodological support for the design and optimization of mechanical properties of CPI blended material.Figure [28] table [9] reference [90]...