Characterization of precursors of crosslinked polymers in the free-radical crosslinking copolymerization of benzyl methacrylate with polyethylene glycol dimethacrylate

Matsumoto, Akira; Ohashi, Tomonori; Aota, Hiroyuki

doi:10.1016/s0014-3057(00)00087-2

Cited by 5 publications

(1 citation statement)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In our previous research,12, 13 the preparation of novel amphiphilic polymers as crosslinked polymer precursors, different from the preceding types of amphiphilic polymers, was reported as an extension of our work on the elucidation of the mechanism and control of three‐dimensional network formation in the free‐radical crosslinking polymerization and copolymerization of multi‐vinyl compounds with the aim to molecularly design vinyl‐type network polymers;14 that is, the free‐radical crosslinking copolymerization of benzyl methacrylate (BzMA) with tricosaethylene glycol dimethacrylate [CH 2 C(CH 3 )CO(OCH 2 CH 2 ) 23 OCOC(CH 3 )CH 2 , PEGDMA‐23] in the presence of lauryl mercaptan (LM) as a chain‐transfer agent was investigated. Because BzMA forms rather rigid, nonpolar primary polymer chains and PEGDMA‐23 as a crosslinker contains a flexible, polar poly(oxyethylene) unit, the resulting prepolymers as vinyl‐type network‐polymer precursors would provide novel amphiphilic polymers.…”

Section: Introductionmentioning

confidence: 87%

Novel amphiphilic network polymers consisting of nonpolar, short primary polymer chains and polar, long crosslink units: Influence of characteristic dangling chains on swelling behavior of resulting amphiphilic gels

Doura

Aota

Matsumoto

2004

J. Polym. Sci. A Polym. Chem.

Self Cite

View full text Add to dashboard Cite

Novel amphiphilic network polymers consisting of nonpolar, short primary polymer chains and polar, long crosslink units were prepared, and the swelling behavior of resulting amphiphilic gels is discussed by focusing on the influence of characteristic dangling chains; that is, benzyl methacrylate (BzMA) was copolymerized with tricosaethylene glycol dimethacrylate [CH2C(CH3)CO(OCH2CH2)23OCOC(CH3)CH2, PEGDMA‐23] in the presence of lauryl mercaptan as a chain‐transfer agent because BzMA forms nonpolar, short primary polymer chains and PEGDMA‐23 as a crosslinker contains a polar, long poly(oxyethylene) unit. The enhanced incorporation of dangling chains into the network polymer was brought by shortening the primary polymer chain length, and copolymerization with methoxytricosaethylene glycol methacrylate, a mono‐ene counterpart of PEGDMA‐23, enforced the incorporation of flexible dangling poly(oxyethylene) chains into the network polymer, although the former dangling chains as terminal parts of primary poly(BzMA) chains were rather rigid. Then, the influence of characteristic dangling chains on the swelling behavior of amphiphilic gels was examined in mixed solvents consisting of nonpolar t‐butylbenzene and polar methanol. The profiles of the solvent‐component dependencies of the swelling ratios were characteristic of amphiphilic gels. The introduction of dangling poly(oxyethylene) chains led not only to an increased swelling ratio but also to sharpened swelling behavior of amphiphilic gels. The swelling response of amphiphilic gels was checked by changing the external solvent polarity. The dangling chains with freely mobile end segments influenced the swelling response of gels. The amphiphilic gels with less entangled, collapsed crosslink units exhibited faster swelling response than the ones with more entangled, collapsed primary polymer chains. © 2004 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 42: 2192–2201, 2004

show abstract

Section: Introductionmentioning

confidence: 87%