The pH-responsive behaviour of poly(acrylic acid) in aqueous solution is dependent on molar mass

被引：331
|
作者：
Swift, Thomas [1 ,2 ]
Swanson, Linda [1 ]
Geoghegan, Mark [3 ]
Rimmer, Stephen [1 ,2 ]
机构：
[1] Univ Sheffield, Dept Chem, Brook Hill, Sheffield S3 7HF, S Yorkshire, England
[2] Univ Bradford, Sch Chem & Forens Sci, Richmond Bldg, Bradford BD7 1DP, W Yorkshire, England
[3] Univ Sheffield, Dept Phys & Astron, Hounsfield Rd, Sheffield S3 7RH, S Yorkshire, England
来源：
SOFT MATTER | 2016年 / 12卷 / 09期
基金：
英国工程与自然科学研究理事会;
关键词：
COIL-GLOBULE TRANSITION; RESOLVED FLUORESCENCE ANISOTROPY; POLY-N-ISOPROPYLACRYLAMIDE; WATER-SOLUBLE POLYMERS; CONFORMATIONAL BEHAVIOR; POLY(METHACRYLIC ACID); RADICAL POLYMERIZATION; MOLECULAR-WEIGHT; ACRYLIC-ACID; LUMINESCENCE;
D O I：
10.1039/c5sm02693h
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Fluorescence spectroscopy on a series of aqueous solutions of poly(acrylic acid) containing a luminescent label showed that polymers with molar mass, M-n < 16.5 kDa did not exhibit a pH responsive conformational change, which is typical of higher molar mass poly(acrylic acid). Below this molar mass, polymers remained in an extended conformation, regardless of pH. Above this molar mass, a pH-dependent conformational change was observed. Diffusion-ordered nuclear magnetic resonance spectroscopy confirmed that low molar mass polymers did not undergo a conformational transition, although large molar mass polymers did exhibit pH-dependent diffusion.
引用
收藏
页码：2542 / 2549
页数：8
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