Preparation of Lactic Acid Based Polyurethanes Modified by Castor Oil

Biao Fu; Lin Xiao; Long Jiang Yu; Guang Yang

doi:10.4028/www.scientific.net/AMR.47-50.1458

Paper Titles

Insertion Behavior of Microneedles for Drug Delivery
p.1442

Microstructure Control and Pseudoelasticity of Ti-Nb-Ge Alloy
p.1446

Effect of Oxygen Content on Microstructure and Mechanical Properties of Ti-Nb-Ge Alloys for Biomedical Application
p.1450

An Investigation into Dual-Source and Dual-Power Electrospinning of Nanofibrous Membranes for Medical Applications
p.1454

Preparation of Lactic Acid Based Polyurethanes Modified by Castor Oil
p.1458

Preparation and Characterization of Golden-Colored Pigments Based on Silver Coated with Metal Oxides
p.1462

Effects of Lead and Boride Inhibitors on the Passivity of Nickel Alloy 600 Surface
p.1466

A Study on the Tribological Behavior of Valve Train System by Low Friction Coating
p.1470

Fabrication of Chemiluminescence Sensor Based on the Funcinalized MWCNT-Nafion Composite Film
p.1474

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Preparation of Lactic Acid Based Polyurethanes Modified by Castor Oil

Abstract:

A series of biodegradable lactic acid based Polyurethanes modified by castor oil (PLBA-PUs) have been successfully prepared by using a two steps method as follow: Firstly prepolymers with hydroxyl terminated are synthesized by copolymerization of L-lactic acid and 1, 4-butandiol (BD), and then react with castor oil (C.O.) and hexamethylene diisocynate (HDI). The effects of BD/LA monomer ration and C.O./prepolymers mole ratio on the molecular weight and mechanical properties of PLBA-PUs are investigated. The polymers obtained are characterized by gel permeation chromatography, fourier transform infrared spectroscopy, 13C NMR, differential scanning calorimeter (DSC) and tensile testing. Their average molecular weight is over 280,000. They display excellent mechanical properties, such as a tensile strength as high as 31MPa, a tensile modulus as low as 20 MPa, and an elongation at break of 176%. Due to the biocompatibility, these PUs could find applications in biomedical fields, such as soft-tissue engineering.