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PLA- PMMA- PEG Blends, Shape Memory Investigation

Khodabakhshi Sadeghabadi, Hossein | 2020

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 54078 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Forounchi, Masoud
  7. Abstract:
  8. Semi-crystalline polylactic acid (PLA) and amorphous polymethyl methacrylate can form a soluble and miscible alloy in which the crystalline regions in the polylactic acid act as the fixed and immutable region and amorphous regions of the two polymers act as the changeable region. The two polymers can form a lattice structure with physical connections having shape-memory. So that the deformed polymer returns to its original shape above a certain temperature. These materials are used in sensors, smart materials, and medicine. On the other hand, Polyethylene glycol (PEG) is compatible with polylactic acid (PLA) and it seems that adding it will increase the ductility of polylactic acid (PLA). In this project, the polylactic polymer acid (PLA) system, polymethyl methacrylate (PMMA), and polyethylene glycol (PEG) (PLA/PMMA/PEG) are evaluated in different compositions in terms of structure and properties of the shape-memory polymer (SMP).Shape-memory polymers (SMPs) are intelligent materials that, when exposed to an external stimulus, can recover their permanent form from a temporary form. SMPs are prepared in dual (double mixture) or complex (triple or multiple mixtures) by melting or solvent methods.Polylactic acid/polymethyl methacrylate (PLA/PMMA) alloy was prepared by solution method with Dimethylformamide (DMF) solvent at 50° C and also with chloroform solvent at room temperature. By tensile test, differential scanning calorimetry (DSC) test, and rheology test (Rheometer), the thermal and mechanical properties of the alloy films were determined. The Fourier transform infrared (FTIR) spectroscopy was used to analyze the chemical structure of the alloy. The results of scanning electron microscopy (SEM) electron microscopy showed the non-porous structure of the alloy.In this study, it was found that PMMA should form the polymer matrix and the amount of PLA should be low. As PLA increases, the uniformity vanishes and the two materials become incompatible. The PEG content should also be in a maximum of 20% PLA in solution
  9. Keywords:
  10. Polylactic Acid ; Shape Memory Polymers ; Poly Methylmethacrylate ; Polyethylen Glycol (PEG) ; Differential Scanning Calorimetry

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