Transparent and flexible films of new segmented polyurethane nanocomposites incorporated by NH2-functionalized TiO2 nanoparticles |
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| Affiliation: | 1. Institute of Materials Science, Vietnam Academy of Science and Technology, 18-Hoang Quoc Viet, Hanoi, Viet Nam;2. Department of Natural Science, Nha Trang Pedagogic College, Khanh Hoa, Viet Nam;3. Department of Physics and Oxide Research Center, Hankuk University of Foreign Studies, Yongin 449-791, South Korea;4. Department of Physics, Chungbuk National University, Cheongju 361-763, South Korea;1. Research and Development Centre, Bharathiar University, Coimbatore 641 046, Tamil Nadu, India;2. Centre for Scientific and Applied Research, School of Basic Engineering and Sciences, PSN College of Engineering and Technology, Tirunelveli 627 152, Tamil Nadu, India;3. Post Graduate and Research Department of Zoology, Raja Dorai Singam Government Arts College, Sivagangai 630 561, Tamil Nadu, India;1. Research Centre, Bharathiar University, Coimbatore 641046, India;2. Department of Chemistry, Arignar Anna Govt. Arts College, Namakkal 637002, India;1. School of Materials Science and Engineering, Hefei University of Technology, Hefei 230009, China;2. Research Centre for Powder Metallurgy Engineering and Technology of Anhui Province, Hefei 230009, China;3. School of materials Science and engineering, Xiangtan University, Xiangtan 411105, China |
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| Abstract: | In this work, TiO2 nanoparticles are surface modified by NH2-terminated organic moieties arised from 4,4′-methylene diphenyl diisocyanate (MDI). These nanoparticles are incorporated into ether-based segmented polyurethane (SPU) matrix. MDI is utilized as monomer together with poly(tetramethylene oxide) (PTMO) comonomer for preparing the final polymer as well. The NH2-functionalized TiO2 nanoparticles are covalently linked to the NCO terminals of the resulting SPU macromolecules during film preparation stage. Therefore, in addition to butylene glycol, these surface modified nanoparticles with enhanced organophilicity could play the role of the second chain extender of NCO-capped SPU macromolecules through formation of urea linkages. Optical and thermal behaviors of the transparent and flexible film (SPU/TiO2–MDI) is compared with those of unmodified TiO2 (SPU/TiO2) and TiO2-unloaded SPU films. Though the particle loading is only 5 wt.%, incorporation of TiO2 and TiO2–MDI nanoparticles into the SPU polymer enhances significantly the light absorption in UV region at 300–400 nm. SEM images of the prepared films clearly show a considerable decrease in particle aggregation for TiO2–MDI into SPU matrix compared to that of unmodified TiO2. TG analyses indicate a one-step decomposition pattern with onset temperatures of about 360 and 380 °C for neat SPU and SPU/TiO2–MDI, respectively. Moreover, DTA thermograms of both nanocomposites show obviously two exothermic phase transitions in the thermal range of 330–440 °C. |
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| Keywords: | Segmented polyurethane Polymer-based nanocomposite UV/vis DRS Thermal behavior |
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