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Citation: LI Gu, MAI Kan-Cheng, FENG Kai-Cai, LIU Zhen-Xing. Dilute Solution Properties of Sulfonated Styrene-Isoprene-Styrene Triblock Copolymer and Its Ionomers[J]. Chinese Journal of Applied Chemistry, ;2004, 21(5): 518-520. shu

Dilute Solution Properties of Sulfonated Styrene-Isoprene-Styrene Triblock Copolymer and Its Ionomers

1.
Key Laboratory for Polymeric Composites and Functional Materials of the Ministry of Education, School of Chemistry and Chemical Engineering, Zhongshan University, Guangzhou 510275

Corresponding author: LI Gu,
Received Date: 29 July 2003
Available Online: 20 November 2003
Fund Project: 广东省自然科学基金(021731)重点项目 (021731)

The relationship between the reduced viscosity and concentation of sulfonated styrene-isoprene-styrene triblock copolymer(SSIS) and its ionomers in toluene and toluene/methanol solutions were studied. The intrinsic viscosity [η\] was calculated. The results show that SSIS tends to form an intra-molecular chain interaction and form more enclosed molecular chain with a lower reduced viscosity and intrinsic viscosity when the sulfonation degree x(SO₃H) decreased. A change of interaction from intra-to inter-molecular chain was observed, and the intrinsic viscosity improved from 0.641 dL/g to 0.656 dL/g by increasing the sulfonation degree from 3.95% to 7.36% due to the chain combination. This also make the size of molecular chain of SSIS larger than SIS. Although be a precipitant for SIS, a few amounts of methanol can change the solubility of SSIS in toluene by destroying the combination of molecular chain. Lanthanum ionomers showed a lower reduced viscosity as compared with sodium and zinc ionomers.
- sulfonated styrene-isoprene-styrene triblock copolymer,
- reduced viscosity,
- intrinsic viscosity,
- solution property
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