二维红外相关光谱研究缠结对冷冻升华无规聚苯乙烯分子运动的影响.PDF

2006 64 Vol. 64, 2006 13 , ACTA CHIMICA SINICA No. 13, · · a *,a b (a 200433) (b 200433) 1104 2 105 g/mL (a-PS). FTIR , a-PS , , a-PS . , a-PS , , a-PS , , CH2 , a-PS . ; ; ; ; Two-Dimensional (2D) FTIR Spectroscopic Study on Influence of Entanglements on Movements of Freeze-dried Atactic Polystyrene Molecules SUN, Bing-Jiea WU, Pei-Yi*,a FAN, Zhong-Yongb a ( Department of Macromolecular Science and Key Laboratory of Molecular Engineering of Polymers, Ministry of Education, Fudan University, Shanghai 200433) b ( Department of Materials Science, Fudan University, Shanghai 200433) Abstract In order to learn the influence of entanglements and other factors on the structural changes of atactic polystyrene, freeze-dried single-chain samples were prepared from dilute solutions of atactic poly- 4 5 styrene (a-PS) in benzene at different concentrations (1 10 and 2 10 g/mL). In this study, the anneal- ing process of the above-mentioned samples at various temperatures for different periods of time has been investigated using Fourier transform infrared (FTIR). According to the IR spectroscopy, when annealing at the temperature of 210 , the peak area of δ(CH2) bands first decreased gradually and did not ch