New thermal-responsive polymers based on alanine and (meth)acryl amides

doi:10.1039/c4py00480a

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	New thermal-responsive polymers based on alanine and (meth)acryl amides
	Yu, Deyang 1; Luo, Chunhui 2; Fu, Wenxin 1; Li, Zhibo 1
刊名	POLYMER CHEMISTRY
	2014
卷号	5 期号:15 页码:4561-4568
ISSN号	1759-9954
DOI	10.1039/c4py00480a
英文摘要	Five (meth) acrylamide derivatives containing alanine ester/amide residues were synthesized and then polymerized using RAFT polymerization. After polymerization and further treatment of the obtained polymers with excess radical initiators, we obtained a series of homopolymers with well-defined molecular weights and end groups. Depending on the structure of side-chain terminal groups, these alanine-containing homopolymers displayed thermal-responsive behaviors in water. Samples containing a methyl ester group, i.e., poly(MA-L-Ala-OMe) and poly(Ac-L-Ala-OMe), showed low critical solution temperature (LCST) behaviors. Replacing methyl ester with ethyl or isopropyl ester groups caused loss of thermal-responsive properties. However, replacing the isopropyl ester with isopropyl amide groups can regain thermal-responsive polymers such as poly(MA-L-Ala-(i)PA). We further studied the LCST behaviors of these three homopolymers with respect to the degree of polymerization (DP), concentration, salt concentration, and chirality of amino acids. It was found that the cloud point (CP) decreased with increasing polymer concentration, DP and salt concentration. The CPs of the polymers prepared from a pair of enantiomers showed no distinct difference, while the random copolymer of the two enantiomers displayed higher CP than optically pure homopolymers.
语种	英语
出版者	ROYAL SOC CHEMISTRY
WOS记录号	WOS:000339044000019
内容类型	期刊论文
源URL	[http://ir.iccas.ac.cn/handle/121111/51365]
专题	中国科学院化学研究所
通讯作者	Li, Zhibo
作者单位	1.Chinese Acad Sci, Inst Chem, Beijing Natl Lab Mol Sci, Beijing 100190, Peoples R China 2.Beifang Univ Nationalities, Coll Chem & Chem Engn, Ningxia 750021, Yinchuan, Peoples R China
推荐引用方式 GB/T 7714	Yu, Deyang,Luo, Chunhui,Fu, Wenxin,et al. New thermal-responsive polymers based on alanine and (meth)acryl amides[J]. POLYMER CHEMISTRY,2014,5(15):4561-4568.
APA	Yu, Deyang,Luo, Chunhui,Fu, Wenxin,&Li, Zhibo.(2014).New thermal-responsive polymers based on alanine and (meth)acryl amides.POLYMER CHEMISTRY,5(15),4561-4568.
MLA	Yu, Deyang,et al."New thermal-responsive polymers based on alanine and (meth)acryl amides".POLYMER CHEMISTRY 5.15(2014):4561-4568.