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Bicyclo‐orthoester as a low‐shrinkage additive in cationic UV curing
Author(s) -
Sangermano Marco,
Malucelli Giulio,
Delleani Gabriele,
Priola Aldo
Publication year - 2007
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/pi.2263
Subject(s) - cationic polymerization , tmpta , shrinkage , photopolymer , curing (chemistry) , orthoester , materials science , polymer chemistry , polymerization , monomer , epoxy , photoinitiator , ether , elastomer , composite material , chemical engineering , chemistry , organic chemistry , polymer , engineering
A commercially available bicyclo‐orthoester (BOE) was used as low‐shrinkage additive for cationic UV curing of epoxy resins. A high reactivity of BOE by ring‐opening homopolymerization has been observed under cationic UV curing conditions. The BOE and trimethylolpropane triglycidyl ether monomers are compatible and give rise to a cured copolymeric network, under UV irradiation, with a flexibilization increase by increasing the BOE content in the photocurable formulation. Shrinkage after photopolymerization shows a linear reduction by increasing the BOE content in the photocurable formulation; a volume expansion upon polymerization is reached in the presence of 50 wt% of the additive. Copyright © 2007 Society of Chemical Industry