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Preparation of graded index plastic rods doped with Sm 3+ by interfacial‐gel polymerization
Author(s) -
Zhang Qijin,
Sun Xuefei,
Wang Pin
Publication year - 1998
Publication title -
polymer international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.592
H-Index - 105
eISSN - 1097-0126
pISSN - 0959-8103
DOI - 10.1002/(sici)1097-0126(199802)45:2<185::aid-pi886>3.0.co;2-8
Subject(s) - methyl methacrylate , polymerization , materials science , monomer , polymer chemistry , refractive index , samarium , molar mass distribution , chemistry , composite material , polymer , organic chemistry , optoelectronics
A novel graded index (GI) poly(methyl methacrylate) (PMMA) rod was prepared by interfacial‐gel polymerization carried out in a PMMA tube with one closed end. Bromobenzene (BB), a higher refractive index molecule, was used to obtain a graded index distribution and samarium octanoate (SOA) was used as a dye with Sm 3+ concentrations from 60ppm to 700ppm. For a poly‐merization system containing methyl methacrylate (MMA) as monomer, azobis‐isobutyronitrile (AIBN) as initiator and dodecyl mercaptan as chain transfer agent, the difference of the refractive index from the centre to the periphery of the rod (Δ n ) with various BB and Sm 3+ contents was determined. Experimental results showed that a parabolic profile of refractive index formed on the cross‐section of the rod and Δ n increased with increase of BB content. SOA has little effect on the profile within the given concentrations. The GI distribution may be calculated by free volume theory. The result is identical with the experimental distribution. © 1998 SCI.