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THERMAL CHARACTERISATION OF XB 2-CA 4 : CYCLIC POLY ( BUTYLENE TEREPHTHALATE ) WITH STANNOXANE CATALYST by ALICE

Thermal Characterisation of XB2-CA4: Cyclic Poly(Butylene Terephthalate) with Stannoxane Catalyst The following investigation presents the melting, polymerisation and crystallisation kinetics of XB2-CA4, an oligomer powder of cyclic butylene terephthalate with a stannoxane catalyst, which polymerises into cyclic poly(butylene terephthalate) (cPBT). When heated this material undergoes very rapid concurrent polymerisation and crystallisation. These processes were separated using a combination of two different techniques in the DSC, and Avrami analyses on the data produced. As reported in previous literature it was thought that Stannoxane catalyst degradation above 220 o C caused production of linear polymer[1]. However, FTIR and GPC experiments on samples heated to 230 o C and 250 o C, do not show production of linear polymer, but rather an increased production of cylcic polymer, but of a slightly lower molecular weight than that produced at 170 o C and 190 o C. It was initially thought that XB2-CA4 did not melt below 170 o C, however, GPC experiments showed that some heavier molecules were produced in samples that were held at 150 o C for more than 5 minutes. The molecular weight distributions from the GPC showed some significant findings with regard to the potential degradation of the samples above 220 o C.