Non-isothermal crystallization kinetics and nucleation activity of hyperbranched polyester (HBPET) in recycled PET

作者：Saeed, Haroon A. M.; Eltahir, Yassir A.; Xia, Yumin; Wang Yimin^*

来源：Polymer Bulletin, 2014, 71(3): 595-612.

DOI：10.1007/s00289-013-1080-3

• Recycled PET
• Non-isothermal crystallization
• Crystallization half-time (t(1/2))
• Hyperbranched polyester
• Nucleating activity

The non-isothermal crystallization of pure recycled polyethylene terephthalate (RPET) and its blends with 3 and 5 wt% hyperbranched polyester (HBPET) were investigated by differential scanning calorimetry (DSC). The DSC curves demonstrate that the melt-crystallization temperatures of the blends are always higher than that of pure RPET regardless of the cooling rate. Their non-isothermal crystallization kinetics was further analyzed with modified Avrami equation, Ozawa equation and Mo method. The analysis reveals that the crystallization half-time (t (1/2)) of the blends is shorter than pure RPET. The activation energy of crystallization of RPET was also determined according to Kissinger method and it is found to decrease remarkably in RPET-3 and RPET-5 blends. All the results indicate that HBPET serves as an effective nucleating agent for RPET.

• 出版日期2014-3
• 单位东华大学