Abstract
As a part of basic studies concerned with the modification of diallyl phthalate (DAP) resin, the curing reaction of DAP was investigated in detail in the presence of methacrylate-network. That is, the curing processes in various monomethacrylate-dimethacrylate-DAP systems were examined, in which monomethacrylate-dimethacrylate copolymer network is formed as a first network at an early stage of polymerization, reflecting of high polymerizability and low copolymerizability of methacrylate monomer toward DAP. Thereafter, the polymerization of DAP proceeds in the presence of the first network.
The tensile strength of the cured resin was first measured under various conditions ; the enhancement of strength was induced by the first network of moderate crosslinking density and of good compatibility with DAP polymer chain. This result was then discussed from the following standpoints, i. e. 1) the formation of first network in DAP and 2) the polymerization of DAP in the presence of the first network. Thus, the enhanced strength of cured resin can be attributed to a reduction of the size of the microgel produced in the curing process of DAP, as a consequence of restricted space of polymerization by first network.
