Theoretical study and enhancement of the birefringence of fluorinated poly(methacrylate)

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• 作者：Jin Wang ; Biao Xu ; Tao Lu ; Xu Fu ; Ji Xu ; Yunqing Lu
• 关键词：PMATRIFE ; PMAPF ; Orientation ; Birefringence ; Shear stress
• 刊名：Colloid and Polymer Science
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：295
• 期：1
• 页码：237-246
• 全文大小：
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Polymer Sciences; Soft and Granular Matter, Complex Fluids and Microfluidics; Characterization and Evaluation of Materials; Physical Chemistry; Food Science; Nanotechnology and Microengineering;
• 出版者：Springer Berlin Heidelberg
• ISSN：1435-1536
• 卷排序：295

文摘

In this paper, the birefringences of two fluorinated polymers, namely, poly(trifluoroethyl methacrylate) (PMATRIFE) and poly(methacrylate of pentafluorophenyl) (PMAPF), are studied. It is found that the molecular structure and molecular orientation of these polymers are the two main factors influencing the birefringence. The calculations show that the material birefringence (Δn) of PMAPF is greater than that of PMATRIFE by 0.00009, while the intrinsic birefringence (Δn₀) of PMATRIFE is greater than that of PMAPF by 0.0378. The lower Δn₀ of PMAPF is caused by the benzene ring in the repeat unit. On the other hand, the planarity of the benzene ring can enhance the degree of orientation of the PMAPF molecular chains, which is three times larger than that of PMATRIFE, and consequently a larger Δn of PMAPF. Furthermore, the effect of different shear rates on the birefringences of PMATRIFE and PMAPF is examined. The calculations reveal that their Δns are enhanced.