摘要
采用乙酸乙酯为环型和线型聚苯乙烯的非良溶剂,确定了Mark-Houwink方程分别为[η]r=1.91×10^(-2)·M^(0.607)和[η]l=4.06×10^(-2)·M^(0.572)。研究了环型和线型聚苯乙烯的激基缔合物的荧光效应。通过稀溶液中环型和线型高分子线团在柔顺性上存在着差异,解释了二者之间在荧光效应方面的差异,并根据实验结果,确定了(I_E/I_M)c→0～M关系式分别为(I_E/I_M)r,c→0=1.91+3.40×10^(-6)M和(I_E/I_M)l.c→0=2.15+3.05×10^(-6)M。
Mark-Houwink equations of ring-shaped and linear polystyrene in ethyl acetatewere obtained as: [η]_r=1.91×10^(-2)·M^(0.607) and [η]_1=4.06×10^(-2)·M^(0.572). The excimer fluorescent effect of the ring-shaped and linear polystyrene wasstudied. According to the difference of flexibility between ring-shaped and linearpolymer coils in their dilute solution formed by not good solvent the difference ofthe excimer effect between them may be interpreted. Two correlation linear equationsconcerning to the (I_E/I_M)_(c→0) versus molecular weight of the samples were obtained.(I_E/I_M)_(r, c→0)=1. 91+3. 40×10^(-6)·Mand (I_E/I_M)_(1, c→0)=2. 15+3. 05×10^(-6)·M
出处
《物理化学学报》
SCIE
CAS
CSCD
北大核心
1992年第2期186-190,共5页
Acta Physico-Chimica Sinica
基金
国家自然科学基金
关键词
聚苯乙烯
激基缔合物
荧光
环形
Ring-shaped polystyrene
Linear polystyrene
Mark-Houwink equation
Excimer
Fluorescent effect
