Thesis
Investigation of effect of plasticizer and compatibilizers on soy protein ternary blends
Washington State University
Master of Science (MS), Washington State University
2012
Handle:
https://hdl.handle.net/2376/102474
Abstract
In this research, plasticization and mixing of soy protein concentrate (SPC) with poly (butylene adipate-co-terephthalate) (PBAT) and poly (lactic acid) (PLA) were carried out simultaneously in a single-step compounding process. The effects of plasticizer were investigated. Compatibilizers were found to be indispensible for creating high performance blends and greatly influenced SPC phase morphology in blends. This study investigated the influence of these factors on the phase structure of PLA/PBAT/SPC blends and on the structure-property relationship. To investigate the plasticization effect on the morphological, tensile and dynamic mechanical properties of PLA/PBAT/SPC composites, acetyl tributyl citrate (ATBC) was added to composites at levels of 0, 3, and 6%. ATBC was found to be effective in creating PLA/PBAT/SPC composites with good toughness. Elongation of plasticized PLA/PBAT/SPC composites was much higher than that of unplasticized composites. This study also explored fracture morphology through scanning electron microscopy (SEM), indicating a good dispersion of fillers in the polymer matrix. This study also investigated structure-property relationships in detail. To investigate the compatibilization effect on the morphological, tensile and dynamic mechanical properties of PLA/PBAT/SPC composites, PEOX, PLA-g-MA and PBAT-g-MA were added to the composites at levels of 0, 3, and 6%. The grafting degrees of PLA-g-MA and PBAT-g-MA were 0.75% to 1.18%, respectively. Compatibilizers were found to be indispensable for developing PLA/PBAT/SPC composites with high mechanical and physical properties. The tensile properties of compatibilized PLA/PBAT/SPC composites were higher than those of uncompatibilized ones. Fracture morphology was investigated through scanning electron microscopy (SEM), and indicates enhanced interfacial adhesion. An investigation of dynamic rheology and dynamic mechanical properties also confirmed a percolated network structure.
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Details
- Title
- Investigation of effect of plasticizer and compatibilizers on soy protein ternary blends
- Creators
- Shan Li
- Contributors
- Jinwen Zhang (Degree Supervisor)
- Awarding Institution
- Washington State University
- Academic Unit
- Materials Science and Engineering Program
- Theses and Dissertations
- Master of Science (MS), Washington State University
- Publisher
- Washington State University; Pullman, Wash. :
- Identifiers
- 99900525037201842
- Language
- English
- Resource Type
- Thesis