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Exposure Reciprocity Law in Photopolymerization of Multi‐Functional Acrylates and Methacrylates
Author(s) -
Feng Li,
Suh Byoung I.
Publication year - 2007
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.200600480
Subject(s) - photopolymer , monomer , methacrylate , reciprocity (cultural anthropology) , polymer chemistry , oligomer , viscosity , chemistry , double bond , materials science , polymer , composite material , organic chemistry , psychology , social psychology
The applicability of the exposure reciprocity law (ERL) to the photopolymerization of acrylates and methacrylates was investigated. It was found that when the oligomer/monomer mass ratio in the systems studied was equal to or greater than 6:4, the ERL applied quite well. The applicability of the ERL to individual (meth)acrylates was judged by comparing the ratio of the lowest DC under one of the three I ‐ t combinations to the highest DC under another I ‐ t combination. The ERL is deemed to apply better to a monomer whose ratio is close to unity. It was found that the viscosity and the number of double bonds are two primary attributes. Photopolymerization of those with more than one double bond and with viscosity higher than 100‐200 mPa · s closely obeys the ERL. This is because the two factors promote the realization of the reaction‐diffusion‐controlled process, which facilitates monomolecular termination of free radicals.