Phase Behaviours of Polybutadiene–Polyacrylic Acid Brushes in Compressed Carbon Dioxide
Rui Zhang A D , Lixiao Liu A , Yicun Wen A , Yu Cang A , Guixin Shi A , Yingyi Zhao B , Xiaoling Liu B , Ying Lin B , Jun Xu A , Zhiming Zhou A and Xuhong Guo A C D
+ Author Affiliations
- Author Affiliations
A State Key Laboratory of Chemical Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, China.
B Department of Food Science and Engineering, Guangxi University, Nanning 530004, China.
C Key Laboratory of Materials-Oriented Chemical Engineering of Xinjiang Uygur Autonomous Region, Shihezi University, Xinjiang 832003, China.
D Corresponding authors. Email: r.zhang@ecust.edu.cn; guoxuhong@ecust.edu.cn
Australian Journal of Chemistry 68(8) 1255-1260 https://doi.org/10.1071/CH14579
Submitted: 19 September 2014 Accepted: 22 December 2014 Published: 20 March 2015
Abstract
Our present work investigated the phase behaviour of polybutadiene–poly acrylic acid (PB–PAA) brushes–solvent–CO2 ternary system in detail. The phase separation pressures increased with increasing temperatures and solid contents of PB–PAA solution, and decreased with increasing sizes of the brushes. Considering that the expansion of water was much smaller than that of ethanol by compressed CO2, a higher cloud point pressure of CO2 could be employed to reach the phase separation when water was added as the co-solvent. Owing to the penetration of CO2 into the periphery of the shell, the chains of the polymer brushes initially shrank and then turned to aggregations before finally precipitating upon CO2 addition. Our results provide a simple and effective way for separation and recovery of polymer brushes that could promote a wider range of their applications.
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