Influence of the mixing time on the phase structure and glass-transition behavior of poly(ethylene terephthalate)/poly(ethylene-2,6-naphthalate) blends

• Published in: Journal of applied polymer science Vol. 130; no. 1; pp. 673 - 679
• Main Authors: Tao, Wang, Wei, Wu, Yu, Chen, Ren, Wu, Qiaoling, Luo
• Format: Journal Article
• Language: English
• Published: Hoboken Wiley Subscription Services, Inc., A Wiley Company 05.10.2013; Wiley; Wiley Subscription Services, Inc
• Subjects: Applied sciences; Blends; Differential scanning calorimetry; Dynamic tests; Exact sciences and technology; Glass transition; Machinery and processing; Materials science; Moulding compound preparation. Mixing; Plastics; polyesters; Polymer blends; Polymer industry, paints, wood; Polymers; Solid phases; Technology of polymers; Tensile strength; Terephthalate; Ethylene terephthalate polymer; Mixing; Polymer blends; Mechanical model; Mixing time; Ester polymer; Mechanical properties; Tensile property; Transesterification; Experimental study; Modeling; Heterogeneous mixture; polyesters; Glass transition; Dynamic mechanical properties; Naphthalate polymer; Morphology; Mechanical loss; blends
• ISSN: 0021-8995; 1097-4628
• DOI: 10.1002/app.39196

Blends of poly(ethylene terephthalate) and poly(ethylene‐2,6‐naphthalate) (70 : 30 w/w) were prepared via a melt‐mixing process at 280°C with various mixing times. The melt‐mixed blends were analyzed by magnetic resonance spectroscopy, differential scanning calorimetry, dynamic mechanical measurements, transmission electron microscopy, and tensile tests. The results indicate that the blends mixed for short times had lower extents of transesterification and were miscible to a limited extent. The blends initially show two glass transitions, which approached more closely and merged gradually with increasing mixing time. A mechanical model was used to help understand the glass‐transition behavior. With increasing mixing time, the phase structure of the blends improved, and this led to an increase in the tensile strength. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013