Abstract
Poly(ester-urethane) urea (PEUU) based on ethanolamine as a chain extender contain hydroxyl and amino groups was chemically synthesized using 1,1'-methylenebis(4-isocyanatobenzene) MDI diisocyanates, and castor oil. One step polymerization procedure has been used to complete the PEUU formation and this polymeric target was irradiated with different doses (100, 250, 400, and 600 kGy) of gamma rays. A full physico-electrochemical characterization package was performed on the solid surfaces, radiated vs. non-irradiated, for a better understanding of the structure changes. To that end, Fourier transform infrared spectroscopy (FTIR), and the morphological features were characterized by the scanning electron microscope (SEM). Thermal stability was investigated using differential scanning calorimetry (DSC), while the crystallinity and electrochemical properties were explored by the X-ray diffraction (XRD), and cyclic voltammetry (CV), respectively. Eventually, swelling, crosslinking density, mechanical strength, water absorption, and contact angle measurements were discussed. Ultimately, the crosslinking density was discovered to be irradiated dependent. Worth mentioning here, this kind of study is recommended as a protocol that could be applied on other polymeric targets exposed to electromagnetic radiations.
Highlights
Synthesis of Poly(ester-urethane) urea (PEUU) Co-based polyurethane Urea (PUU) was synthesized according to previous reports [30, 31]
The characteristic absorption at 2267cm-1 (N=C stretching) of the -NCO group is disappeared, indicating that all the isocyanate groups are incorporated into the copolymerization, and complete formation of PEUU [35, 36]
C=O stretch of ordered C=O...H-N in the urethane and urea groups indicated the successful chain extension and displayed effect which increased with increasing the hard segment content by urea groups, this has been identified in all curves (PEUU0 to PEUU600) [37]
Summary
Synthesis of Poly(ester-urethane) urea (PEUU) Co-based polyurethane Urea (PUU) was synthesized according to previous reports [30, 31]. CO - MDI - ETA was synthesized by a typical one step polymerization procedure as is shown in Scheme 1 and their feed ratios were 1:0.6:0.4. The resulting viscous (PEUU) was poured into a silica mold and heated at 50 °C for 100 h in an oven to obtain a complete polymerization. The samples were conveyed to a roll mill mixer for few minutes to remove air bubbles through the casting process. The HS and SS contents are calculated using equation (1) and (2) respectivel
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