TY - JOUR
T1 - Fabrication of high glass transition temperature graded-index plastic optical fiber
T2 - Part 1- Material preparation and characterizations
AU - Nakao, Ryosuke
AU - Kondo, Atsushi
AU - Koike, Yasuhiro
N1 - Funding Information:
Manuscript received October 21, 2011; accepted December 09, 2011. Date of publication January 06, 2012; date of current version January 25, 2012. This work was supported by the Japan Society for the Promotion of Science (JSPS) through the Funding Program for World-Leading Innovative R&D on Science and Technology (FIRST Program).
Copyright:
Copyright 2012 Elsevier B.V., All rights reserved.
PY - 2012
Y1 - 2012
N2 - With a view to fabricating high glass transition temperature (T g) graded-index plastic optical fiber (GI POF) by the coextrusion process, core material consisting of copolymer of 2,2,2-trichloroethyl methacrylate (TCEMA) and N-cyclohexyl maleimide (cHMI) (P(TCEMA-co-cHMI)), and diphenyl sulfide (DPS) as dopant was newly developed. Although homo polymer of TCEMA (PTCEMA) possesses high T g and high transparency, it was found that PTCEMA began depolymerization at ca. 200 \circ C, which means that PTCEMA-based GI POF fabricated by the coextrusion process has low T g due to depolymerized monomer. By copolymerizing TCEMA with cHMI (5 mol%), the rate of weight loss at constant temperature T = 230°C was drastically decreased (15 wt%/hr). Moreover, the T g linearly increased from 130°C to 197 \circ C with increasing cHMI composition ratio from 0 to 62 wt%, respectively. Scattering loss of the copolymer was increased with the increase of cHMI composition ratio due to the refractive index difference between PTCEMA and PcHMI. It was found that the increment of the scattering loss was suppressed significantly when the copolymer includes DPS (120 dB/km decrease by adding 4 wt% DPS for the copolymer including 5 mol% cHMI). From these results, P(TCEMA-co-cHMI)-based core material was thought to be a promising candidate for high T g GI POF.
AB - With a view to fabricating high glass transition temperature (T g) graded-index plastic optical fiber (GI POF) by the coextrusion process, core material consisting of copolymer of 2,2,2-trichloroethyl methacrylate (TCEMA) and N-cyclohexyl maleimide (cHMI) (P(TCEMA-co-cHMI)), and diphenyl sulfide (DPS) as dopant was newly developed. Although homo polymer of TCEMA (PTCEMA) possesses high T g and high transparency, it was found that PTCEMA began depolymerization at ca. 200 \circ C, which means that PTCEMA-based GI POF fabricated by the coextrusion process has low T g due to depolymerized monomer. By copolymerizing TCEMA with cHMI (5 mol%), the rate of weight loss at constant temperature T = 230°C was drastically decreased (15 wt%/hr). Moreover, the T g linearly increased from 130°C to 197 \circ C with increasing cHMI composition ratio from 0 to 62 wt%, respectively. Scattering loss of the copolymer was increased with the increase of cHMI composition ratio due to the refractive index difference between PTCEMA and PcHMI. It was found that the increment of the scattering loss was suppressed significantly when the copolymer includes DPS (120 dB/km decrease by adding 4 wt% DPS for the copolymer including 5 mol% cHMI). From these results, P(TCEMA-co-cHMI)-based core material was thought to be a promising candidate for high T g GI POF.
KW - Graded index plastic optical fiber
KW - high glass transition temperature
KW - poly(2,2,2-trichloroethyl methacrylate-co-N- cyclohexyl maleimide)
KW - thermal degradation
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U2 - 10.1109/JLT.2011.2180700
DO - 10.1109/JLT.2011.2180700
M3 - Article
AN - SCOPUS:84856302542
SN - 0733-8724
VL - 30
SP - 247
EP - 251
JO - Journal of Lightwave Technology
JF - Journal of Lightwave Technology
IS - 2
M1 - 6125204
ER -