Using hyperbranched macromers as crosslinkers of methacrylic networks prepared by photopolymerization

Sara Pedrón; Paula Bosch; Carmen Peinado

doi:10.1016/j.jphotochem.2008.07.002

Using hyperbranched macromers as crosslinkers of methacrylic networks prepared by photopolymerization

Sara Pedrón, Paula Bosch, Carmen Peinado

Research output: Contribution to journal › Article › peer-review

Abstract

Hyperbranched polymers were modified with terminal methacryloyl groups to be used as crosslinkers. The photoinitiated polymerization of several methacrylic monomers was examined in the presence of the hyperbranched macromers and bis-(2,4,6-trimethylbenzoyl)-phenylphosphine oxide (Irgacure 819^®) as a photoinitiator, upon UV irradiation. The photopolymerization kinetics was systematically studied by fluorescence and photoDSC in real time and in situ. Six types of monofunctional methacrylic monomers, two types of difunctional methacrylic monomers and four types of (meth)acrylate-modified hyperbranched macromers with different structures were employed for series of photopolymerization reactions. The incorporation of the hyperbranched macromers allows to increase the conversion at gelation and thus, final conversion. This behaviour is dependent on monomer and macromer nature and has been explained as due to an increase of the free volume fraction and confirmed by fluorescence. The results indicate that H-bonding and π-stacking induce self-assembly of hyperbranched macromers leading to reaction induced phase separation at the highest concentration of hyperbranched macromer used.

Original language	English (US)
Pages (from-to)	126-140
Number of pages	15
Journal	Journal of Photochemistry and Photobiology A: Chemistry
Volume	200
Issue number	2-3
DOIs	https://doi.org/10.1016/j.jphotochem.2008.07.002
State	Published - Dec 15 2008
Externally published	Yes

Keywords

Fluorescence
Hyperbranched macromers
Networks
Photopolymerization
Self-assembly

ASJC Scopus subject areas

General Chemistry
General Chemical Engineering
General Physics and Astronomy

Online availability

10.1016/j.jphotochem.2008.07.002

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title = "Using hyperbranched macromers as crosslinkers of methacrylic networks prepared by photopolymerization",

abstract = "Hyperbranched polymers were modified with terminal methacryloyl groups to be used as crosslinkers. The photoinitiated polymerization of several methacrylic monomers was examined in the presence of the hyperbranched macromers and bis-(2,4,6-trimethylbenzoyl)-phenylphosphine oxide (Irgacure 819{\textregistered}) as a photoinitiator, upon UV irradiation. The photopolymerization kinetics was systematically studied by fluorescence and photoDSC in real time and in situ. Six types of monofunctional methacrylic monomers, two types of difunctional methacrylic monomers and four types of (meth)acrylate-modified hyperbranched macromers with different structures were employed for series of photopolymerization reactions. The incorporation of the hyperbranched macromers allows to increase the conversion at gelation and thus, final conversion. This behaviour is dependent on monomer and macromer nature and has been explained as due to an increase of the free volume fraction and confirmed by fluorescence. The results indicate that H-bonding and π-stacking induce self-assembly of hyperbranched macromers leading to reaction induced phase separation at the highest concentration of hyperbranched macromer used.",

keywords = "Fluorescence, Hyperbranched macromers, Networks, Photopolymerization, Self-assembly",

author = "Sara Pedr{\'o}n and Paula Bosch and Carmen Peinado",

note = "Funding Information: The authors would like to thank the Plan Nacional I + D + I (Ministerio de Ciencia e Innovaci{\'o}n) for financial support (MAT2006-05979) as well as the Comunidad Aut{\'o}noma de Madrid for the funding through I + D Program (S0505/MAT-0227).",

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AU - Pedrón, Sara

AU - Bosch, Paula

AU - Peinado, Carmen

N1 - Funding Information: The authors would like to thank the Plan Nacional I + D + I (Ministerio de Ciencia e Innovación) for financial support (MAT2006-05979) as well as the Comunidad Autónoma de Madrid for the funding through I + D Program (S0505/MAT-0227).

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N2 - Hyperbranched polymers were modified with terminal methacryloyl groups to be used as crosslinkers. The photoinitiated polymerization of several methacrylic monomers was examined in the presence of the hyperbranched macromers and bis-(2,4,6-trimethylbenzoyl)-phenylphosphine oxide (Irgacure 819®) as a photoinitiator, upon UV irradiation. The photopolymerization kinetics was systematically studied by fluorescence and photoDSC in real time and in situ. Six types of monofunctional methacrylic monomers, two types of difunctional methacrylic monomers and four types of (meth)acrylate-modified hyperbranched macromers with different structures were employed for series of photopolymerization reactions. The incorporation of the hyperbranched macromers allows to increase the conversion at gelation and thus, final conversion. This behaviour is dependent on monomer and macromer nature and has been explained as due to an increase of the free volume fraction and confirmed by fluorescence. The results indicate that H-bonding and π-stacking induce self-assembly of hyperbranched macromers leading to reaction induced phase separation at the highest concentration of hyperbranched macromer used.

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Using hyperbranched macromers as crosslinkers of methacrylic networks prepared by photopolymerization

Abstract

Keywords

ASJC Scopus subject areas

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