Dispersion of Carbon Black in Isoprene Rubber and Its Static and Dynamic Properties

doi:10.19894/j.issn.1000-0518.220078

Chinese Journal of Applied Chemistry ›› 2022, Vol. 39 ›› Issue (12): 1842-1853.DOI: 10.19894/j.issn.1000-0518.220078

Dispersion of Carbon Black in Isoprene Rubber and Its Static and Dynamic Properties

Yong-Peng LYU¹^,², Yu-Ge WANG¹^,², Qian-Qian GU¹^,², Zhi-Cai ZHANG¹^,², Jian-Shu XIAO¹^,², Yuan YIN¹, Hong-Guo SUN¹, Ya-Fang ZHENG¹, Zhao-Yan SUN¹^,²()

^1.State Key Laboratory of Polymer Physics and Chemistry，Changchun Institute of Applied Chemistry，Chinese Academy of Sciences，Changchun 130022，China
^2.School of Applied Chemistry and Engineering，University of Science and Technology of China，Hefei 230026，China

Received:2022-03-17 Accepted:2022-08-03 Published:2022-12-01 Online:2022-12-13
Contact: Zhao-Yan SUN
About author:zysun@ciac.ac.cn
Supported by:
the National Natural Science Foundation of China(21790344)

Abstract

Abstract:

It is necessary to add some fillers into raw rubber to enhance the performance of rubber materials. It is well known that the distribution and dispersion of fillers have a great effect on the mechanical properties of rubber. To understand the relationship between dispersion of fillers and the mechanical properties of rubber， different mixing processes are performed， and then the rubber materials with different dispersion states of fillers are obtained. Moreover， the dispersion grade of fillers， the agglomerate size distribution， the vulcanization property， the tension and fatigue properties of different rubbers are investigated. It is seen that the dispersion grade increases and the Mooney viscosity decreases with increasing internal mixing time from 4 to 16 min. When the internal mixing time is 16 min， the dispersion grade reaches 8.1. However， the tension property of different rubbers only shows little difference. Astonishingly， the fatigue life is greatly enhanced with increasing internal mixing time. Similar results are found when changing the roll banding time of rubber. It is seen that， with increasing roll banding time， the dispersion of fillers increases first and then decreases， and then the fatigue life greatly increases first and then falls down although the tension property only shows little difference. When the roll banding time is 20 min， the fatigue life reaches 4×10⁴ times， and the fatigue life decreases to 2.3×10⁴ times when further increasing the roll banding time. This implies that the mixing process can be used to modulate the dispersion state of fillers in rubber， and then changes the fatigue property of rubber.

Key words: Isoprene rubber, Dispersion of carbon black, Fatigue property, Mixing process

CLC Number:

O631

Yong-Peng LYU, Yu-Ge WANG, Qian-Qian GU, Zhi-Cai ZHANG, Jian-Shu XIAO, Yuan YIN, Hong-Guo SUN, Ya-Fang ZHENG, Zhao-Yan SUN. Dispersion of Carbon Black in Isoprene Rubber and Its Static and Dynamic Properties[J]. Chinese Journal of Applied Chemistry, 2022, 39(12): 1842-1853.

Figures/Tables 9

Fig.1 The dispersion grades（A）， dispersion percentage（B）， white area percentage（C） and agglomerations size distribution（D） of mixed rubber and vulcanized rubber obtained by different internal mixing time

Fig.2 The storage modulus of mixed rubber （A） and vulcanized rubber （B） under different strains. The insets show the storage modulus difference between small strain （~0.1%） and large strain （~50%） of mixed rubber and vulcanized rubber with different internal mixing time， respectively

Fig.3 The vulcanization curve （A）， the positive vulcanization time and scorch time （B）， the maximum torque and the difference between maximum and minimum torque （C） and the Mooney viscosity of rubbers （D） obtained with different internal mixing time

Fig.4 The tensile strength and elongation（A）， the fatigue temperature（B）， the tensile fatigue life（C） and the cracking grade during flexural fatigue（D） of vulcanized rubber with different internal mixing time

Fig.5 The dispersion grades （A）， dispersion percentage （B）， white area percentage C） and agglomerations size distribution （D） of mixed rubber and vulcanized rubber obtained by different roll banding time

Fig.6 The storage modulus of （A） mixed rubber and （B） vulcanized rubber under different strains. The insets show the storage modulus difference between small strain （~0.1%） and large strain （~50%） of mixed rubber and vulcanized rubber with different roll banding time， respectively

Fig.7 The vulcanization curve（A）， the positive vulcanization time and scorch time （B）， the maximum torque and the difference between maximum and minimum torque （C） and the Mooney viscosity （D） of rubbers obtained with different roll banding time

Fig.8 The tensile strength and elongation （A）， the fatigue temperature （B）， the tensile fatigue life （C） and the cracking grade during flexural fatigue （D） of vulcanized rubber with different roll banding time

Fig.9 Surface morphology of vulcanized rubber （internal mixing 4 min） before fatigue test with low （A） and high （E） magnification； Surface morphology of vulcanized rubber （internal mixing 16 min） before fatigue test with low （B） and high （F） magnification； Surface morphology of vulcanized rubber （internal mixing 4 min） after fatigue test with low （C） and high （G） magnification； Surface morphology of vulcanized rubber （internal mixing 16 min） after fatigue test with low （D） and high （H） magnification

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[1]	Jian-Shu XIAO, Yu-Ge WANG, Qian-Qian GU, Zhi-Cai ZHANG, Yong-Peng LYU, Yuan YIN, Hong-Guo SUN, Ya-Fang ZHENG, Zhao-Yan SUN. Formation of Network by Carbon Black， Silica and Their Mixing Fillers in Isoprene Rubber [J]. Chinese Journal of Applied Chemistry, 2022, 39(12): 1833-1841.
[2]	Xu Jian, Xu He chang, Wu Guanying. THE COMPATIBILITY OF C1 IIR/PS GRAFTCOPOLYMER [J]. Chinese Journal of Applied Chemistry, 1991, 0(2): 16-19.

Dispersion of Carbon Black in Isoprene Rubber and Its Static and Dynamic Properties

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