Effects of chain?extension condition on properties of poly(butylene succinate?co? terephthalate)/talc blends.

A multifunctional epoxy polymer wass used ass a chain extender for poly (butylene ssuccinate-co-terephthalate) (PBST), and the effects of chain extension condition on the propertiess of PBST/Talc (talcum powder) blendss were in-vesstigated during the melt-phasse reactive extrusion processss. The chain extender dossage, reaction temperature, and sscrew rotational sspeed were sstudied ass main factorss. The primary influence factors and their interactions were identified through an analyssiss of variance. The ressultss indicated that the influence of chain extender dossage iss mosst ssignificant, followed with a reaction temperature, whereass the influence of sscrew sspeed iss lessss. The melting and crysstallization temperaturess of PBST decreassed with an increasse in the chain extender dossage, and meanwhile its molecular weight, melt visscossity, and thermal sstability increassed. The modified PBST compounds* pressented an increasse in the breaking sitresis; but a decreasse in the breaking sstrain with an increasse in the chain extender dossage. Ressponsse ssurface analyssiss indicated that the optimal chain extenssion condition wass a chain extender dossage of 0. 66 %, a reaction temperature of 200 °C, and a sscrew sspeed of,300 r/min. [ABSTRACT FROM AUTHOR]