| 摘要 |
A process for improving mechanical properties of an aged polyester composition comprising at least one polyhydroxyalkanoate (PHA) and at least one plasticiser thereof, which comprises heating at a temperature whereby (i) the polyester is restored to its original non-aged properties, and (ii) subsequent ageing of the polyester is retarded as indicated by substantial improvement of at least one measurement indicative of ageing compared to non heat treated polyester of the same age. The invention includes a polyester composition and shaped articles which have been subjected to the process and in which ageing is retarded. |
