Main-chain type benzoxazine polymers consisting of polypropylene glycol and phenyleneethynylene units: spacer effect on curing behavior and thermomechanical properties

Kobayashi, Takumi; Muraoka, Masanobu; Goto, Masahide; Miyamoto, Masaki; Sogawa, Hiromitsu; Sanda, Fumio

doi:10.1038/s41428-021-00568-x

Cited by 4 publications

(1 citation statement)

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“…However, it is difficult for polycondensation via the Mannich reaction approach to maintain the stoichiometry during the condensation reaction due to many side reactions, resulting in MCBPs with low molecular weight . Although novel Bz monomers with many reactive end groups (e.g., ethynyl, propargyl, allyl, alcohol, and so on) have been designed to overcome these difficulties to some extent, the versatility and molecular flexibility of MCBPs are limited severely by these approaches. − …”

Section: Introductionmentioning

confidence: 99%

Curing Kinetics of Main-Chain Benzoxazine Polymers Synthesized in Continuous Flow

Zhou

Wan

et al. 2022

Ind. Eng. Chem. Res.

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Main-chain benzoxazine polymers MCBP(BPA-ddm)s were synthesized in continuous flow under various residence times of 5, 10, and 15 min. MCBP(BPA-ddm)s with high molecular weight above 5000−10 000 g mol −1 and high purity over 93% oxazine ring-closed ratio were obtained, which were characterized using Fourier transform infrared (FTIR) spectroscopy, nuclear magnetic resonance spectroscopy, and size exclusion chromatography. In situ FTIR spectroscopy and differential scanning calorimetry were performed to understand the curing reaction and kinetics of MCBP(BPA-ddm)s, suggesting a typical thermally driven self-catalyzed ring-opening polymerization profile with an apparent activation energy of 82−118 kJ mol −1 , which follows firstorder curing kinetics regardless of the molecular weight.

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