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- W2384016946 abstract "N-2-hydroxyethyl-N-methy-laniline(HMA) was compared to N,N-dimethyl aniline(DMA) as cure reaction promoters for an unsaturated polyester resin.It was found that for benzoyl peroxide(BPO) initiation at room temperature,HMA is efficient than the more commonly used DMA,as indicated by decreased cure times or increased peak exotherm and barcol hardness.HMA was used with good results instead of toxic DMA in peroxide crosslinking of unsaturated polyester resin,improving the work environment and the colour of castings.Examination of cured sample using differential scanning calorimetry showed that resins cured with HMA displayed higher glass transtion temperatures and greater degrees of cure than samples cured using DMA.HMA is more active promoter than DMA owing to the formation of intramolecular hydrogen bond between hydroxide radical and nitrogen atom lead to the poor conjugated of the lone electron pair of nitrogen and π orbit of benzene.Therefore,the electron density of nitrogen is bigger than DMA,the nucleophilicity of promoter HMA is enhanced." @default.
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- W2384016946 date "2007-01-01" @default.
- W2384016946 modified "2023-09-26" @default.
- W2384016946 title "Hardening of N-2-hydroxyethyl-N-methy-laniline for Unsaturated Polyester Resin" @default.
- W2384016946 hasPublicationYear "2007" @default.
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