Allyl Resins. III. Polymerization of Monomers

Abstract

AbstractThe refractive indices and Viscosities of six allyl resins, Polymerized at 70°C, with 1% catalyst, have been found to increase with the increase of, time of polymerization, especially those containing polyfunctional groups. The specific gravities of those resins containing bifunctional groups, such as allyl stearate, have been found to increase with the increase of time up to a certain point, and then to remain constant.The conversions of monomers containing more than two functional groups, such as tri‐allyl citrate (T.A.C.), di‐allyl phthalate (D.A.P.) and di‐allyl adipate (D.A.A.) were different. T.A.C. attained highest percentage of conversion, while. D.A.A., the lowest.When D.A.P. was copolymerized with T.A.C., only a slight increase of percentage conversion was observed, but with D.A.A., instead of T.A.C., the percentage conversion decreased. When T.A.C., D.A.A., or allyl stearate was used as modifier in the polymerization of D.A.P., the volume contraction of the latter decreased considerably with the increase of the modifier and reached a minimum if the content of modifier was 9% by volume. The contraction increased greatly when 10% of the modifier had been added.