Photoinitiated modifications of polymers: photocrosslinking, surface photografting and photolamination |
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Authors: | Bengt Rånby |
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Affiliation: | (1) Department of Polymer Technology, Royal Institute of Technology, SE-10044 Stockholm, Sweden Fax: 0046-8-10-0775 e-mail: magruder@polymer.kth.se, SE |
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Abstract: | Based on extensive studies of photoinitiated reactions of synthetic polymers, processes for modification of sheets, films,
filaments and yarn have been invented and developed. Using ultra violet irradiation, photocrosslinking of polyethylene melts as a continuous process on line with an extruder has been invented. Effective photocrosslinking has
also been obtained for ethylene-propylene-diene (EPDM) elastomers and ultra high strength fibers of high density polyethylene
(HDPE). A continuous process for surface modification of polymers by surface photografting has been invented and applied to strips of film, filaments and yarns. The inert surface of polyolefins, polyesters and polyamids,
grafted with functional vinyl monomers, show decreased contact angle with water, increased adsorption of dyes and increased
adhesion to other polymers. Photoinitiated lamination of polymer films and sheets has been invented and developed as a ”bulk surface photografting process”. Two or more films
and sheets are interdispersed with reactive layers of monomer and initiator and then bonded together by photoinitiated grafting
with ultraviolet irradiation. The crosslinked network formed is grafted to two adjacent polymer surfaces. This gives laminates
of high lamination strength, high barrier properties, and promising commercial applications.
Received: 8 April 1998 / Accepted: 22 May 1998 |
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Keywords: | Photocrosslinking Surface photografting Photoinitated lamination Polymer sheets films filament and yarns Polyolefins polyesters and polyamides Functional vinyl monomers |
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