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- 저자 : Zahida Tariq Cheema (검색결과 1 건)
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Mohammad Zuber,Khalid Mahmood Zia,Muhammad Ashair Iqbal,Zahida Tariq Cheema,Muhammad Ishaq,Tahir Jamil 한국화학공학회 2015 Korean Journal of Chemical Engineering Vol.32 No.1
The present research work was performed to study the properties of polyurethanes (PU) based on ali-phatic diisocayanate and the effect of chemical structure of chain extenders. Two series of PUs were synthesized via twosteps polymerization technique. The PU samples constituted on hexamethylene diisocayanate (HDI), hydroxy-termi-nated polybutadiene (HTPB) and blends 1, 4 butanediol (BDO)/bisphenol A (BPA) and or 1, 4 butanediol (BDO)/bisphenol S (BPS) were prepared. Structural characterization was done using Fourier transform infrared spectroscopyduring and after the synthesis. The FTIR analysis confirmed the existence of proposed bisphenol A (BPA) and bisphe-nol S (BPS) based PU structures. Differential scanning calorimeter (DSC) analysis gives information about the thermaltransition of all the polymer samples. Because of the difference of polarity between hard and soft segments of PU,microphase separation can occur. The degree of phase separation in the prepared PU was confirmed using scanningelectron microscope (SEM) technique. The SEM techniques present a distinctive chance to directly visualize the mor-phology of the polyurethanes.
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