Characterization of brominated poly(4-hydroxystyrene) derivatives containing unsaturated groups

Nagai, Atsushi; Katagiri, Junichi; Takahashi, Akio; Wajima, M.; Mukoh, Akio

doi:10.1016/0032-3861(90)90333-t

Cited by 4 publications

(2 citation statements)

References 7 publications

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“…All polymers were synthesized by reactions of brominated poly(4-hydroxystyrene) (HS) (Maruzen Petrochemical Co., Ltd.) with the corresponding acyl chlorides in dichloromethane and water mixture solvents as reported in our earlier paper. 7 To synthesize brominated poly(methacryloyloxystyrene) with different molecular weights (M-series), we used HS with different molecular \\'eights. Representative examples of synthetic procedure for R-series polymers is as follows.…”

Section: Mate Rials and Sample Preparationmentioning

confidence: 99%

“…7 Brominated poly( 4-methacryloyloxystyrene) were used as a flame retarder for multi layered circuit boards. 6 In this paper, we use brominated poly( 4-methacryloyloxystyrene) derivatives with different concentration of reactive side groups and molecular weights, and study the relationship of the network microstructures and mechanical properties of the cured products.…”

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Dependence of Molecular Weight and Concentration of Reactive Side Chains on the Mechanical Properties of Cured Brominated Poly(4-methacryloyloxystyrene) Derivatives

Suzuki

Nagai

Katagiri

et al. 1995

Polym J

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ABSTRACT:Brominated poly(4-methacryloyloxystyrene) derivatives with different molecular weights and different concentrations of reactive side chains were synthesized. They were heated with radical initiator to be highly crosslinked products. Free volume of cured products increased with molecular weight of the starting materials. The thermal expansion coefficient and peak temperature of {]-dispersion became lower with increasing free volume of the cured products. These results may be attributed to the dependence of molecular weight on the balance between intermolecular and intramolecular reactions. Many intramolecular reactions may lead to loop formation, when the molecular weight of the starting polymer is high.KEY WORDS Brominated Poly(4-methacryloyloxystyrene) / Free Volume/ Mechanical Property / Viscoelastic Property /

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Section: Mate Rials and Sample Preparationmentioning

confidence: 99%

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confidence: 99%

Dependence of Molecular Weight and Concentration of Reactive Side Chains on the Mechanical Properties of Cured Brominated Poly(4-methacryloyloxystyrene) Derivatives

Suzuki

Nagai

Katagiri

et al. 1995

Polym J

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Thermal behavior and cured products of fluorine‐containing bismaleimides

Nagai

Takahashi

Suzuki

et al. 1992

J of Applied Polymer Sci

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Thermal behavior of fluorine-containing bismaleimides was investigated by differential scanning calorimetry and the effects of introducing fluorine groups on thermal behavior and properties of cured products were discussed. The melting point was lower and the polymerization temperature was higher with increasing fluorine content. This decrease in polymerization reactivity of fluorine-containing bismaleimide was explained by the stabilization energy of the double bond or the bismaleimide molecule itself as calculated by the MNDO or MM method. Thermal polymerization of the double bond was interpreted by an autocatalytic reaction mechanism in which the activated biradical product accelerated the radical propagation. It was found that the fluorine-containing cured product had good thermal stability and a low dielectric constant.

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