Effects of chain-extension condition on properties of poly(butylene succinate-co-terephthalate)/talc blends
A multifunctional epoxy polymer was used as a chain extender for poly(butylene succinate-co-terephthalate)(PBST),and the effects of chain extension condition on the properties of PBST/Talc(talcum powder)blends were in-vestigated during the melt-phase reactive extrusion process.The chain extender dosage,reaction temperature,and screw rotational speed were studied as main factors.The primary influence factors and their interactions were identified through an analysis of variance.The results indicated that the influence of chain extender dosage is most significant,followed with a reaction temperature,whereas the influence of screw speed is less.The melting and crystallization temperatures of PBST decreased with an increase in the chain extender dosage,and meanwhile its molecular weight,melt viscosity,and thermal stability increased.The modified PBST compounds presented an increase in the breaking stress but a decrease in the breaking strain with an increase in the chain extender dosage.Response surface analysis indicated that the optimal chain extension condition was a chain extender dosage of 0.66%,a reaction temperature of 200℃,and a screw speed of 300 r/min.
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