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Effects of Phase Morphology on Mechanical Properties: Oriented/Unoriented PP Crystal Combination with
Dashan Mi1,2, Yingxiong Wang3, Maja Kuzmanovic4
1College of Polymer Science and Engineering, State Key Laboratory of Polymer Materials Engineering, Sichuan University, Chengdu 610065, China. midashan@126.com.
Polymers
|April 10, 2019
Summary
Controlling polypropylene (PP) and poly(ethylene terephthalate) (PET) blend structures via in situ microfibrillation and multiflow vibrate injection molding enhances mechanical properties. Tailoring phase morphology and using compatibilizers are key for optimizing performance.
Area of Science:
- Polymer Science
- Materials Engineering
- Mechanical Engineering
Background:
- Polypropylene (PP) and poly(ethylene terephthalate) (PET) are immiscible polymers.
- Controlling the morphology of polymer blends is crucial for optimizing mechanical properties.
- Developing effective strategies for the mechanical recycling of polymer blends is essential.
Purpose of the Study:
- To investigate the influence of processing methods on the phase morphology of PP/PET blends.
- To understand how different phase structures and compatibilizers affect the mechanical properties of PP/PET blends.
- To provide a theoretical basis for the mechanical recycling of immiscible polymer blends.
Main Methods:
- In situ microfibrillation combined with multiflow vibrate injection molding (MFVIM).
- Fabrication of four distinct phase structures by varying processing conditions.
- Analysis of the effects of PET content, PP matrix morphology, and compatibilizer (polyolefin grafted maleic anhydride - POE-g-MA) on blend properties.
Main Results:
- Different phase structures were successfully formed, with optimal structures varying based on PET content.
- Oriented microfibrillar PET enhanced properties in an unoriented PP matrix, while unoriented spherical PET improved impact strength in an oriented PP matrix.
- The compatibilizer POE-g-MA formed core-shell structures, improving both yield and impact strength.
Conclusions:
- The mechanical properties of PP/PET blends are significantly influenced by PET fibrillation, PP matrix morphology, and interfacial compatibilization.
- Synergistic effects between these components can further enhance blend performance.
- This study offers a theoretical foundation for the effective mechanical recycling of immiscible PP/PET blends.
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