| 摘要 |
A method for lessening the shear or heat induced reduction in molecular weight of a thermoplastic polyester, and compositions used in and obtained from such method, comprising: admixing at least 50 parts by weight of a first polymer with less than or equal to 50 parts by weight of a second polymer, the first polymer being a thermoplastic polyester, and the second polymer being a TLCP, to obtain a polyester/TLCP mixture, and subjecting the polyester/TLCP mixture to heat or shear, wherein the second polymer comprises at least one monomeric aromatic hydroxyl residue; the first polymer and the second polymer have an overlapping melt processing temperature range; the first polymer and the second polymer are immiscible or partly immiscible when mixed within the overlapping temperature range; and the first polymer and the second polymer are provided in such quantities that the molecular weight of the first polymer in the composition after shear or heat processing is greater than the molecular weight of the first polymer alone after shear or heat processing.
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