Formation of Network by Carbon Black， Silica and Their Mixing Fillers in Isoprene Rubber

doi:10.19894/j.issn.1000-0518.220095

Chinese Journal of Applied Chemistry ›› 2022, Vol. 39 ›› Issue (12): 1833-1841.DOI: 10.19894/j.issn.1000-0518.220095

Formation of Network by Carbon Black， Silica and Their Mixing Fillers in Isoprene Rubber

Jian-Shu XIAO¹^,², Yu-Ge WANG¹^,², Qian-Qian GU¹^,², Zhi-Cai ZHANG¹^,², Yong-Peng LYU¹^,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 Academic of Sciences，Changchun 130022，China
^2.School of Applied Chemistry and Engineering，University of Science and Technology of China，Hefei 230026，China

Received:2022-03-26 Accepted:2022-08-31 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:

The network formed by fillers has great influence on the mechanical properties of rubber materials. To understand the formation of network by carbon black， silica， and carbon black/silica mixing fillers in rubber and its influence on the properties of rubber， isoprene rubber/filler composites with different filler loadings are prepared and their micromorphology， rheological and tensile properties are investigated. It is found that the dispersion of fillers is better in rubber after cure than that in rubber before cure for all three rubber systems， and the filler size of silica is smaller than that of carbon black， but the aggregation is more severe in silica filled rubber system. In mixed filler system， the two fillers tend to aggregate separately， leading to the low modulus at small strain than that in single filler system. With the increase of the filler loading， the tensile strength increases first and then decreases， the elongation at break decreases， and the temperature rise in compression flexometer tests increases. Moreover， the temperature rise in mixed filler system is higher than that in single filler system at high filler loading.

Key words: Filler network, Rubber network, Isoprene rubber, Carbon black, Silica

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.

Figures/Tables 6

Fig.1 Curing curves of isoprene rubber filled with carbon black （A）， silica（B）， and carbon black and silica mixed fillers （C） at different filler loadingsanddifference between maximum torque and minimum torque （D） and the optimum curing time （E） obtained from the curing curve for different filled systems at different loadings

Fig.2 Storage modulus （G′） of unvulcanizated rubber filled with carbon black （A）， silica （B）， and mixed fillers （C）， and vulcanizated rubber filled with carbon black （D）， silica （E）， and mixing fillers （F）

Fig.3 The difference of storage modulus ΔG′ at small strain and large strain for unvulcanized rubber and vulcanized rubber with different fillers versus the mass fraction （A， B） and volume fraction （C， D）， and the storage modulus difference for vulcanizedrubber GVul' and unvulcanized rubber GVul' filled with carbon black （E）， silica （F） and mixed fillers （G）

Fig.4 TEM images of vulcanized rubber filled with carbon black of different mass fraction

Fig.5 SEM （A， B） and TEM （C， D） photograph of unvulcanized rubber and vulcanized rubber filled with different fillers at 45 phr

Fig.6 Tensile strength （A）， elongation at break （B） and temperature rise in compression flexometer tests （C） of vulcanized rubber filled with different fillers

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Formation of Network by Carbon Black， Silica and Their Mixing Fillers in Isoprene Rubber

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