| Summary: | 碩士 === 東海大學 === 化學工程與材料工程學系 === 98 === The UV-A ultraviolet was applied to cure acrylate resins which are
composed of different components and different compositions,
respectively. The samples were completely cured at a fixed UV-exposure
time of 20 minutes under a circulating nitrogen atmosphere during UV
irradiating.
When the photoinitiator content was fixed at 1 wt. % and the ratio
between oligomers and monomers changed, the temperatures of
maximum rate of degradation of the resins with 80MFA oligomer
decreased with increasing oligomer percentage. No matter which
oligomer is used, the coefficients of thermal expansion of the samples
remain constant while the oligomer percentage increases. The glass
transition temperatures of the samples with 3000A oligomer increase
slightly with increasing oligomer percentage.
When the photoinitiator content increased and the amounts of
oligomers and monomers were fixed, the temperatures of maximum rate
of degradation and the coefficients of thermal expansion of the resins
didn’t change regardless of which oligomer is used. The glass transition
temperatures of the samples with 3000A oligomer decrease slightly with
increasing amount of photoinitiator.
Except for the resins with 3000A oligomer, the average surface roughness
of the other samples are about 0.3 ~ 0.8 nm, which are quite small,
indicating a uniform coating.
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