Mechanical Behavior of Recycled Polyethylene Terephthalate/Polycarbonate/Glass Fiber Composites

Haji Rezaei, Mohammad Javad | 2022

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 55157 (07)
  4. University: Sharif University of Technolog
  5. Department: Materials Science and Engineering
  6. Advisor(s): Bagheri, Reza
  7. Abstract:
  8. Nowadays, with the increasing number of polyethylene terephthalate wastes, the issue of its recycling has become very important. Among the problems of polyethylene terephthalate recycling are its loss of crystallinity and mechanical properties. Recycled polyethylene terephthalate does not have the properties of new polyethylene terephthalate and using its mixture with other materials is an effective way to remove its waste from nature and return it to the production cycle. The aim of this study is to produce a mixture of recycled polyethylene terephthalate with polycarbonate and glass fibers with mechanical properties such as good impact strength, which ultimately leads to the production of products that can be used in industry. The fabrication of polyethylene terephthalate / polycarbonate alloys faces two challenges. One is the incompatibility of the two polymers and the other is their tendency to exchange esters during blending, which can have uncontrolled consequences on the structure and properties of the blend. To address the concerns of these two challenges, the project sought to use an adapter and an ester exchange inhibitor.As an adapter, a polyethylene terephthalate / polycarbonate copolymer was fabricated in this project, using two types of catalysts: disodium, pyrophosphate,and zinc acetate dihydrate. Triphenylphosphate was also used as an inhibitor of ester exchange. Fourier transform infrared spectroscopy, differential scanning calorimetry and solubility tests were used to evaluate the ester exchange reaction in the fabricator and the final mixture. Also, tensile, impact and transmission light and field scanning electron microscopy tests were used to evaluate the structure and mechanical properties of the project products. Based on the obtained results, a combination of 50-50% of two polymers and 1% wt zinc catalyst of acetate, dihydrate and a compatible hydrate were identified to make the mixture. The addition of wt% 3 of this compatible with wt% 1 inhibitor to r-PET / PC blend provided acceptable engineering properties for this blend. Also, the simultaneous addition of adapters and inhibitors to the r-PET / PC / GF (30) composite increased its impact strength by more than 35%.Microscopic tests confirmed the positive effect of adding adapters and inhibitors on the adhesion of fibers to the substrate as well as the plastic deformation capability of the substrate
  9. Keywords:
  10. Recycled Polyethylene Terephthalate (PET) ; Polycarbonate ; Glass Fibers ; Ester Exchange Reaction ; Impact Strength ; Polybutylene Terephthalate/Polycarbonate (PBT/PC)Blends

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