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A new method of toughening polymerized cyclic butylene terephthalate (pCBT) with tetrahydrofuran (THF) is proposed. The
pCBT was prepared by in situ ring-opening polymerization of a commercial cyclic butylene terephthalate, a cyclic form of
poly(butylene terephthalate), in the presence of THF. In comparison to conventionally polymerized pCBT, the resultant material
was found to be ductile, showing a strain at break of well above 100% in tensile tests. Other matrix properties, such as tensile
modulus, tensile strength and glass transition temperature, were not significantly altered by the addition of THF. It was found
that the presence of THF enhanced the polymerization reaction, resulting in an increased molecular weight and a narrowed
molecularweightdistribution. Moreover, remaining oligomers after polymerization were extractedby the THF anda toughened
oligomer-free pCBT was obtained. The influence of time and temperature on the long-time toughening action of THF was
studied. The results showed that samples became brittle after 3months when subjected to a temperature of 80 ◦C, resulting in
a reduction of the toughening action.
c 2010 Society of Chemical Industry
CitationAbt, T. [et al.]. Toughening of in situ polymerized cyclic butylene terephthalate by addition of tetrahydrofuran. "Polymer international", Abril 2011, vol. 60, núm. 4, p. 549-556.
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