Solid state polymerization of pet/pc extruded blend: effect of reaction temperature on thermal, morphological and viscosity properties

Polímeros

Patricia Soares da Costa Pereira¹  Sibele Piedade Cestari²  Isaac Albert Mallet²  Luis Claudio Mendes²  Frederico Gonçalves de Albuquerque Dias² 

[1] Universidade Estadual da Zona Oeste;Universidade Federal do Rio de Janeiro;

关键词: SSP;    blend;    optical microscopy;    thermal properties;    viscosity;   

DOI  :  10.1590/0104-1428.1518

来源: DOAJ

【 摘 要 】

A systematic study of solid state polymerization (SSP), concerning the melt extruded blend of poly(ethylene terephthalate)/polycarbonate (catalyzed PET/PC, 80/20 wt %), as a function of temperature range (180-190°C) for a fixed time (6 h) is presented. The materials obtained were evaluated by differential scanning calorimetry (DSC), thermogravimetry/derivative thermogravimetry (TG/DTG), optical microscopy (OM) and intrinsic viscosity (IV) analysis. After SSP, at all reaction temperatures, PET glass transition and heating crystallization temperatures slightly decreased, melting temperature slightly increased, while degree of crystallinity was practically invariable. The DTG curves indicated that, at least, three phases remained. The OM images revealed that the morphology is constituted of a PET matrix and a PC dispersed phase. In the interfacial region we noticed the appearance of structures like bridges linking the matrix and the dispersed domains. These bridges were correlated to the PET/PC block copolymer obtained during blending in the molten state. IV increased for all polymerization temperatures, due to the occurrence of PET chain extension reactions - esterification and transesterification. The IV range for bottle grade PET was achieved.

【 授权许可】

Unknown