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- W32636979 abstract "Abstract : Bis(vinylbenzyl ether) and bis(Vinylbenzyl thioether) have been synthesized from a meta/para mixture of vinylbenzyl chloride. Crude yields of greater than 90% were obtained for both VBE and VBT. The onset and peak temperatures for thermal cure (as observed by DSC) were 80 deg C/110 deg C, and 120 deg C/190 deg C, respectively. Both resins did not exhibit a T, in the second DSC run due to high crosslink density. Crosslinking is assumed to take place through free radical polyaddition with high conversions achieved under thermal cure. Composites formed from these resin had flexural modulus values at room temperature comparable to, or better than, amine-cured epoxies. However, at temperatures above 200 deg C, the VBE and VBT materials had higher moduli than the epoxy samples while the loss in modulus values when heated to 250 deg C was much lower than for epoxy composites. In comparing VBT to VBE, it is clear that VBT composites gave a higher modulus to begin with, and maintained this difference up to 300 deg C. Above 350 deg C, however, the flexural modulus of VBT drops to 22% of its initial value, whereas VBE only dropped to 50%. This is due to faster decomposition of VBT at 350 deg C as confirmed by TGA. Overall, these new resins offer excellent promise for use in high performance composites." @default.
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- W32636979 date "1992-05-29" @default.
- W32636979 modified "2023-09-27" @default.
- W32636979 title "Bis(vinylbenzyl) Ether and Bis(vinylbenzyl) Thioether: Synthesis, Cure Studies and Evaluation for Composites" @default.
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