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Systematic examination of thermal, mechanical and dielectrical properties of aromatic polybenzoxazines

Hamerton, I, Howlin, BJ, Mitchell, AL, McNamara, LT and Takeda, S (2012) Systematic examination of thermal, mechanical and dielectrical properties of aromatic polybenzoxazines Reactive and Functional Polymers, 72 (10). pp. 736-744.

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Abstract

A series of bis-benzoxazines, prepared in high yield and purity using two synthetic procedures, is reported. Differential scanning calorimetry reveals similar temperatures for the onset of polymerisation (162-180 °C); the higher values representing monomers containing polar bridges or rigid backbones. Dynamic viscoelasticity data reveal glass transition temperatures for the polybenzoxazines ranging from 187 °C to 235 °C; a fluorinated polybenzoxazine consistently yields the highest T of the polymers studied. The latter is interesting since it is superior to many commercial benzoxazines with a relatively high T (235 °C), flexural modulus (5.0 GPa) and flexural strength (146.7 MPa), but coupled with a breaking strain (3.06%) that is uncharacteristically high for polybenzoxazines. The incorporation of fluorine results in a low dielectric loss properties (D = 3.71-4.12 at 10 MHz, D = 0.0109 - 0.0980 at 10 MHz), which are comparable with commercial polybenzoxazines, FR4 and aerospace epoxy resins and superior to commercial bismaleimides.

Item Type: Article
Authors :
AuthorsEmailORCID
Hamerton, IUNSPECIFIEDUNSPECIFIED
Howlin, BJUNSPECIFIEDUNSPECIFIED
Mitchell, ALUNSPECIFIEDUNSPECIFIED
McNamara, LTUNSPECIFIEDUNSPECIFIED
Takeda, SUNSPECIFIEDUNSPECIFIED
Date : October 2012
Identification Number : https://doi.org/10.1016/j.reactfunctpolym.2012.07.001
Depositing User : Symplectic Elements
Date Deposited : 28 Mar 2017 13:47
Last Modified : 28 Mar 2017 13:47
URI: http://epubs.surrey.ac.uk/id/eprint/769622

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