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Transitional Process of Ploy(N-isopropylacrylamide) in Deuterated Solution
Shao-hua Zhang1, Yang Chen*1, Heng Li2,3, Yu-xiang Weng2,3
1.Hefei National Laboratory for Physical Sciences at the Microscale, Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China;2.Laboratory of Soft Matter Physics, Institute of Physics, Chinese Academy of Sciences;3.Beijing National Laboratory of Condensed Matter Physics, Beijing 100080, China
Abstract:
The fast phase-transitional process of ploy(N-isopropylacrylamide) (PNIPAM) in deuterated solution was studied by laser induced temperature jump technique combined with time-resolved mid-infrared absorbance difference spectroscopy on nanosecond level. The multi-peaks of amide I0 band of PNIPAM among the energy range of 1565-1700 cm-1 was experimentally resolved to three groups (i, ii, iii) for the first time, while the distinct three-stage procedure in the phase transitional process of long-chain PNIPAM was observed firstly too. Furthermore, proper assignments were also made for the three group peaks in amide I′band and the three steps in the kinetics process of long-chain PNIPAM.
Key words:  Poly(N-isopropylacrylamide), Laser induced temperature jump, Kinetic, Tran-sient mid-infrared absorbance difference spectroscopy, Multistage, Transitional process
FundProject:
Transitional Process of Ploy(N-isopropylacrylamide) in Deuterated Solution
张少华,陈旸*,李恒,翁羽翔
1.中国科学技术大学合肥微尺度物质科学国家实验室,化学物理系,合肥230026;2.中国科学院物理研究所软物质物理实验室,北京凝聚态物理国家实验室,北京100080
摘要:
采用激光诱导温度跃变技术结合纳秒量级时间分辨的中红外吸收差谱的实验方法对聚异丙基丙烯酰胺在重水溶液中的相变过程进行了研究. 首次在实验上观测到位于1570~1700 cm-1 能量范围内酰胺峰I′的瞬态红外差谱的多峰结构和长链聚异丙基丙烯酰胺分子在相变过程中的多步骤动力学过程.
关键词:  聚异丙基丙烯酰胺,激光诱导温度跃变,动力学,瞬态中红外吸收差谱,多阶段,相变过程
DOI:10.1088/1674-0068/22/05/447-452
分类号: