The manufacturing of technology and materials based on benzoxazine resin are limited by melt or solvent-based processing. Solvent based processing depends on the use of organic solvents with impart costs and risks. Non-flammable liquid benzoxazine resin with low curing temperatures are attractive because they exclude organic solvents for processing. In this study three series of blends containing bisphenol A benzoxazine (BA) monomer were prepared with poly(ethylene glycol) methyl ether (mPEGOH) or poly(ethylene glycol) methyl ether tosylate (mPEGOTs). The cure and crystallinity of the blends were studied with differential scanning calorimetry (DSC). From the cure studies a suppression of the max and onset cure temperatures were observed in both of the blends with the tosylated PEG species. The crystallinity study revealed the miscibility of the PEG in BA up to 40 % weight loading in the case of the mPEGOH. In the case of the mPEGOTs blends a larger miscibility range was found. Images generated with scanning electron microscopy (SEM) of cured samples from the mPEGOH series revealed void content after extraction of free PEG. When mPEGOTs blends were studied the PEG was not easily extracted which suggests a melcuolar composite formed. The structural property relationships for molecular weights 2000, 900, and 500 Da PEG components will be discussed.

Performance of liquid benzoxazine-PEG blend resin systems for potential industrial composites processing

253rd National Meeting (2017)

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