| Study on Microstructure Characterization and Application Properties of Star-branched BIIR |
| Received:December 07, 2020 Revised:December 07, 2020 |
| DOI：10.12136/j.issn.1000-890X.2022.02.0083 |
| Key Words: BIIR；star-branched；microstructure；Mooney viscosity；rheological property；physical property；air tightness |
| Author Name | Affiliation | E-mail | | MU Xiaojuan | 1.Shandong Provincial Key Laboratory of Olefin Catalysis and Polymerization；2.The Yellow River Delta Chambroad Institute Co. Ltd | mxj89@aliyun.com | | WANG Yanjin | Shandong Chambroad Sinopoly New Material Co.,Ltd. | | | GAO Bo | 1.Shandong Provincial Key Laboratory of Olefin Catalysis and Polymerization；2.The Yellow River Delta Chambroad Institute Co. ,Ltd | | | Du Qingzhi | 1.Shandong Provincial Key Laboratory of Olefin Catalysis and Polymerization；2.The Yellow River Delta Chambroad Institute Co. Ltd | | | ZHANG Min | Shandong Chambroad Sinopoly New Material Co.,Ltd. | | | HAO Fulan | 1.Shandong Provincial Key Laboratory of Olefin Catalysis and Polymerization
2.The Yellow River Delta Chambroad Institute Co. Ltd | fulan.hao@chambroad.com | | CAI Yinghui* | 1.Shandong Provincial Key Laboratory of Olefin Catalysis and Polymerization；2.The Yellow River Delta Chambroad Institute Co. Ltd | |
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| Abstract: |
| The microstructure and application properties of star-branched brominated butyl rubber
（BIIR）S-2029 were studied and compared with conventional Mooney viscosity BIIR2828，high Mooney
viscosity BIIR2249 and middle Mooney viscosity BIIR2841. The results showed that，there was no significant
difference in the bromine content among the four brands of BIIRs. The Mooney viscosity and Mooney stress
relaxation area of BIIR2249，BIIR2841，BIIR2828 and BIIR S-2029 compounds decreased in turn. BIIR
S-2029 compound had the smallest Mooney viscosity and Mooney stress relaxation area，so it had the best
processing properties. In the shear rate range of 10～1 000 s-1，BIIR S-2029 compound had the smallest
extrusion swell ratio and shrinkage rate，and its molding process performance was the best. The curing
characteristics of the four brands of BIIR compounds had little difference. Affected by the molecular weight
of raw rubber，the modulus at 300% elongation and tensile strength of BIIR2841 and BIIR2249 vulcanizates
were slightly higher than those of other two brands of BIIR vulcanizates，and there was no significant
difference in elasticity，flexure resistance and air tightness among the four brands of BIIR vulcanizates. |
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