new approach for controlling birefringent property of cyclic olefin copolymers

This article reports an original method to control the birefringent property of the cyclic olefin copolymer, which has been recently commercialized as a new type of optical resins, via introduction of a third monomer that possesses a negative birefringence into the cyclic olefin copolymer that exhib...

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Bibliographic Details
Published in:Journal of polymer science. Part A, Polymer chemistry Polymer chemistry, 2008-11, Vol.46 (22), p.7395-7400
Main Authors: Ban, Hoang The, Hagihara, Hideaki, Nishii, Kei, Tsunogae, Yasuo, Nojima, Shuichi, Shiono, Takeshi
Format: Article
Language:English
Subjects:
Applied sciences
birefringent control
catalysts
copolymerization
cyclic olefin copolymer
Electrical, magnetic and optical properties
ethylene
Exact sciences and technology
norbornene
Organic polymers
Physicochemistry of polymers
Properties and characterization
styrene
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Summary:This article reports an original method to control the birefringent property of the cyclic olefin copolymer, which has been recently commercialized as a new type of optical resins, via introduction of a third monomer that possesses a negative birefringence into the cyclic olefin copolymer that exhibits an inherently positive birefringence. The mutual compensation between these opposite-sign birefringences effectively reduced the birefringent magnitude of the corresponding terpolymer. In fact, terpolymerization of norbornene (N), ethylene (E), and styrene (S), in which S exhibits a negative birefringence regarding to the positive birefringence of the NE copolymer was successfully prepared using fluorenylamidodimethyltitanium-based catalyst, yielding NES terpolymers with controllable birefringent property. Especially, when the S content in the NES terpolymer was controlled at optimum values, it is possible to synthesize a new type of the cyclic olefin copolymer that exhibits an extremely low birefringent magnitude close to zero regardless of high degrees of chain orientation.
ISSN:0887-624X
1099-0518
DOI:10.1002/pola.23044