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Synthesis and Evaluation of Poly(lactic Acid)/Polyurethane Nano-composites based on Cellulose Nano-particles, with Biomedical Applications

Mohammadian Ahrabi, Taha | 2023

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 55972 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Shojaei, Akbar; Salkhi Khasraghi, Samaneh
  7. Abstract:
  8. Shape memory polymers have the potential to use in the field of biomedical applications. In this research, polyurethane structures have been synthesized based on the Diol mixtures, consisting of polycaprolactane diol (PCL-diol) and poly (lactic acid) diol (PLA-diol). Aim of reasearch is about evaluating poly (lactic acid) effect in structure of the polyurethane. At the same time, cellulose nanocrystals (CNC) have been added to polymer matrix to improve properties. The synthesis of acrylated polyurethane, included the synthesis of polyurethane acrylate prepolymer. Next, this prepolymer has been cured by adding the reactive diluent and some polyol. The cured systems were investigated, finally, the structure which has been synthesised basde on PCL-based prepolymer and neat PLA-diol, was selected due to its suitable properties. Synthesis of nanocomposites was done by “in situ polymerization method”. Different contents of nanoparticles were used. It has been determined that by adding CNC in the amount of 0.25% by weight, tensile strength, elongation at break, and elastic modulus increased by 65%, 57%, and 10%, respectively. Also, the properties of shape memory, degradation rate, and hydrophilicity of the polymer matrix were significantly improved. However, the addition of CNC to the polymer affected the toxicity of the system, slightly
  9. Keywords:
  10. Nanocomposite ; Nanocellulose ; Acrylated Polyurethane ; Polycaprolactone Composite ; Polylactic Acid ; Biocompatibility ; In-situ Polymerization ; Shape Memory Polymers ; Cellulose Nanocrystalls

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