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Title: Processing and characterization of recycled poly(ethylene terephthalate) blends with chain extenders, thermoplastic elastomer, and/or poly(butylene adipate-co-terephthalate)

Source: Polymer Engineering and Science - 2011 DOI10.1002/pen, pp. 1024-1032; 2011

Author(s)Srithep,Yottha; Javadi, Alireza; Pilla, Srikanth; Turng, Lih-Sheng; Gong, Shaoqin; Clemons, Craig; Peng, Jun

Publication Year: 2011  View PDF »

Category: Journal Articles
Associated Research Project(s):   FPL-4706-2A

Abstract: Poly(ethylene terephthalate) (PET) resin is one of the most widely used thermoplastics, especially in packaging. Because thermal and hydrolytic degradations, recycled PET (RPET) exhibits poor mechanical properties and lacks moldability. The effects of adding elastomeric modifiers, chain extenders (CE), and poly(butylene adipate-co-terephthalate), PBAT, as a toughener to RPET on its moldability and mechanical property were investigated. Melt blending of RPET with CE, thermoplastic elastomer (TPE), and/or PBAT was performed in a thermokinetic mixer (K-mixer). The blended materials were then injection molded to produce tensile specimens. Various techniques were used to study the mechanical properties, rheological properties, compatibility, and crystallization behavior of the RPET blends. By melt blending with proper additives, recycled PET regained its moldability, thereby enabling the recycling of RPET. Furthermore, the addition of CE greatly enhanced the mechanical properties of RPET. While the RPET and TPE blends also showed improved mechanical properties, the improvement was less significant and the blends were often immiscible due to the difference in polarities between RPET and TPE. Finally, it was found that the mechanical properties of RPET blends depended on the prior thermal history of the material and could be improved with an extra annealing step that increased the degree of crystallinity. POLYM. ENG. SCI., 51:1023-1032, 2011. © 2011 Society of Plastics Engineers

Keywords: Polyethylene, composite materials, mechanical properties, thermoplastic composites, flexure, elasticity, extrusion process, injection molding of plastics, bending, testing, polyethylene terephthalate, recycled products, recycling, elastomers, beverages, packaging, crystallization, rheology, chemical reactions, bottling, thermal properties, impact testing, scanning electron microscopy, polymers, polymerization, tensile strength, bending strength, strength, ethylenes, chain extenders, poly(butylene adipate-co-terephthalate), PBAT, crystallinity, thermal degradation, differential scanning calorimetry, moldability

Publication Review Process: Formally Refereed

File size: 858 kb(s)

Date posted: 10/17/2011

This publication is also viewable on Treesearch:  view
RITS Product ID: 40133
Current FPL Scientist associated with this product
Clemons, Craig M.
Materials Research Engineer

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