Theses and Dissertations - UTB/UTPA

Date of Award


Document Type


Degree Name

Master of Science (MS)



First Advisor

Dr. Javier Macossay-Torres

Second Advisor

Dr. Bimal K. Banik

Third Advisor

Dr. Elamin E. Ibrahim


Two types of polyesters [(Poly(ε-caprolactone) and Poly(δ-valerolactone)] were synthesized by ring-opening polymerization with diethylene glycol as a initiator and stannous octate as a catalyst. The corresponding polyurethanes were synthesized by two-step polymerization with 1,4-diisocyanate butane (BDI) and reacted with 1,4-diamino butane (Putrescine) chain extender. The polymers were characterized by Proton Nuclear Magnetic Resonance (1H NMR), Fourier Transform Infrared Spectroscopy (FT-IR), Raman Spectroscopy, Size-exclusive Chromatography (SEC), Thermogravimetric Analysis (TGA) and Differential Scanning Calorimetry (DSC). The resulting polyurethanes were fabricated into nanofibers using an electrospinning technique. The morphological, structural characterizations and thermal properties of the bulk polyurethanes and electrospun polyurethanes nanofibers were analyzed by Scanning Electron Microscopy (SEM), FT-IR, Raman, TGA and DSC. The degradability of electrospun polyurethane nanofibers were investigated in phosphate buffer solution (pH=7.2) at 37°C at a period of 5 days.


Copyright 2012 Xujun Zhang. All Rights Reserved.

Granting Institution

University of Texas-Pan American

Included in

Chemistry Commons