Journal
MACROMOLECULES
Volume 42, Issue 17, Pages 6549-6557Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ma9001403
Keywords
-
Categories
Ask authors/readers for more resources
The highly uniform and dense network structure of photopolymerized thiol-enes was chemically modified. and the enthalpy relaxation of the networks was measured. n-Alkyl acrylate and hydroxyl acrylate groups were incorporated into thiol-ene networks using a phosphine-catalyzed Michael addition reaction. The effect of flexible alkyl side chains and hydrogen bonding on sub-T-g relaxation was evaluated without sacrificing network uniformity. Overall both the rate and extent of enthalpy relaxation decreased as a function of the flexible n-alkyl chain length, while hydrogen bonding resulted in enhanced enthalpy relaxation. A trithiol-triene-triacrylate tertiary system was investigated by correlating enthalpy relaxation and network uniformity. A multifunctional acrylate (TMPTA), being capable of homopolymerization as well as thiol-acrylate copolymerization, was incorporated into a thiol-ene network structure, thereby decreasing the network uniformity and significantly affecting the enthalpy relaxation behavior. In all cases, the extent and rate of enthalpy relaxation were directly related to the heat capacity change at the glass transition which defines the enthalpic departure from equilibrium at it given temperature below T-g.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available