0 + 0 = 2: Changeover of Stability and Photopolymerization
Kinetics for the Rotator Phase of Long-Chain Acrylate through the
Ultra-Addition Effect in Binary Systems
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Abstract
The
stability and lowest existing temperature for the rotator phase
of long-chain acrylate were improved remarkably simply through the
ultra-addition effect of physical blending of two long-chain acrylates,
which leads to a wider operation window and better rotator-state photopolymerization.
Hexadecyl acrylate (HDA) and tetradecyl acrylate (TDA) were proved
existing rotator phase like previously reported octadecyl acrylate
(ODA). The binary rotator phase systems were constructed by mixing
HDA or TDA with ODA and investigated in detail through thermal analysis,
X-ray diffraction, and photopolymerization kinetics. The chain-reaction
photopolymerization conversion of the binary system significantly
increased to 60% from near 0 for pure acrylate, which realized β0
+ 0 = 2β. The mechanism of such an ultra-addition effect was
explained on the basis of X-ray diffraction data and calculation of
the geometric model. The effect of difference in chain length between
two components on this enhancement was studied, and a threshold value
was found