Abstract
Effect of a chemical structure of poly(ether-urethane-urea) (PUU) elastomers on a miscibility of their blends with chlorinated poly(vinyl chloride) (cPVC) has been studied by FTIR and DSC. The segmented PUU were synthesized by prepolymer approach in N,N-dimethylformamide (DMF) solution. PUU-1 was synthesized using poly(propylene glycol) (PPG) of Mn = 1000, mixture of 2,4- and 2,6-isomers of tolylenediisocyanate (TDI) in a ratio of 65:35 (by weight) and 4,4´-methylenedianiline as a chain extender at a molar ratio of 1:2:1. PUU-2 was prepared based on poly(tetramethylene glycol) (PTMG) of Mn = 1000, TDI and cyanoethylated ethylene diamine at a molar ratio of 2:3:1. The polymer-polymer blends were obtained via solution casting technique using DMF as a solvent. It was found a miscibility of the polymers enhances due to a formation of hydrogen or donor-acceptor bonding between polar NH urethane-urea or nitrile groups of hard PUU segments and chlorine of cPVC. According to DSC results the polymer-polymer systems stabilized by stronger donor-acceptor bonding are characterized by single glass transition temperature, Tg, a position of which is higher than that of the theoretical one, TFg, calculated in full composition range via Fox’s equation. When stabilization of polymer-polymer blend with 30 % (by weight) of cPVC performs by weaker hydrogen bonding we observed a formation of mixed phase and the composite is characterized by appearance of three relaxation transitions. Increasing cPVC content reduces a miscibility of the components and biphasic structure of the composites forms. Comparative analysis of experimental and theoretical (additive) tensile strength vs composition dependencies demonstrates an impact of donor-acceptor interface interactions on strength of the polymer composites obtained.
Publisher
National Academy of Sciences of Ukraine (Co. LTD Ukrinformnauka)
Reference16 articles.
1. 1. Omelchenko S.I., Kadurina T.I. Modifitsirovannyie poliuretanyi. K.: Nauk. dumka, 1983: 225. (In Ukrainian).
2. 2. Bélorgey G., Aubin M., Prud'homme R.E. Stadies of polyester/chlorinated poly(vinyl chloride) blends. Polymer, 1982, 23:1051-1056. https://doi.org/10.1016/0032-3861(82)90407-4.
3. 3. Malysheva T.L., Matyushov V.F., Titov G.V., Dyakova A.N. Termoplastichnyie kompozityi na osnove hlorirovannogo polivinilhlorida i poliuretana. PolImerniy zhurnal,. 2005, 27 : 35-39. (In Ukrainian).
4. 4. Malysheva T.L. Kogezionno-adgezionnyie svoystva kompozitsiy na osnove poliure-tanovogo elastomera i hlorvinilovogo polimera. Pitannya hImIYi ta hImIchnoYi tehnologIYi, 2014, 4: 68-73. (In Ukrainian).
5. 5. Wei Wu, Xiao-lie Luo, De-zhu Ma. Miscibility of the segmented polyurethane blends with chlorinated poly(vinyl chloride). Eur. Polym. J., 1999, 35: 985-990. https://doi.org/10.1016/S0014-3057(98)00195-5.