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An inherently flame-retardant poly(lactic acid) (PLA) was synthesized via the chain-extending reactions of dihydroxyl terminated pre-poly(lactic acid) (pre-PLA), which was synthesized by direct polycondensation of l-lactic acid using 1,4-butanediol as initiator and stannous chloride (SnCl 2 ) as catalyst, using ethyl phosphorodichloridate as chain extender. The resulting phosphorus-containing...
The chromatographic and spectroscopic variations of polycarbonate (PC)-epoxy blends during the hot-melt process of dissolving PC in epoxy were observed. The characteristics of PC-epoxy blend are influenced by the following factors: (1) the minor components in the epoxy monomer, (2) the ratio of PC to epoxy in the PC-epoxy blend, and (3) the environment in which the blends are prepared. The water...
Three model reactions are designed to investigate the transesterification between carbonate of PC and hydroxyl group formed from the ring opening reactions of oxirane with amine. Results show that the observed PC-epoxy blend cured by aromatic diamine-metaphenylene diamine (MPDA) and the i.r. absorption band of carbonate group shifts to low frequency during the curing procedure. The product of transesterification...
The reaction mechanism of a polycarbonate (PC) and epoxy blend cured with aliphatic amine was investigated. The spectroscopic variations of the PC-epoxy blend cured by aliphatic amines indicate that the carbamates and ureas appeared in the system. Various methods to prepare the blends were used: (1) PC dissolved in epoxy by hot melt method to obtain the PC-epoxy blend and the aliphatic amine then...
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