Commercial scale fabrication method for fabricating a gradient refractive-index rod: Overcoming volume shrinkage and chemical restrictions.
We report a fabrication method for a gradient refractive-index polymeric object from a binary comonomer system, regardless of the monomers' reactivity ratio and the molar volume criteria of gradient refractive-index development. To fabricate a large gradient refractive-index rod consisting of a methyl methacrylate and 2,2,3,3-tetrafluoropropyl methacrylate comonomer pair that has not been used for fabrication of a copolymer gradient refractive-index rod by previous conventional methods because of chemical restrictions in molar volume and reactivity ratio difference, we use the so-called successive UV polymerization in a controlled radial volume in conjunction with an automatic refill reactor. Simultaneously and automatically, the volume shrinkage problem, an inevitable shortcoming for the fabrication of a large polymeric object in a commercial production scale, is overcome and exploited. The theoretical features of the refractive-index profile generation of this method are also compared with those of conventional methods for which the chemical restrictions of monomers are crucial for the shape of a refractive-index profile.
Cho
Hansol
H
Materials and devices Research Center, Samsung Advanced Institute of Technology, Gyeonggi-do 449-712, South Korea.
Son
Young Mok
YM
Kim
Mu Gyeom
MG
Ra
Byoung Joo
BJ
Park
Joon-Yong
JY
Lee
Seung Hui
SH
Choi
Jin Sung
JS
Song
Min Young
MY
Park
O Ok
OO
Kim
Youn Cheol
YC
Hwang
Jin Taek
JT