Thermal properties of poly(urethane-ester-siloxane)s based on hyperbranched polyester |
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| Authors: | M V Pergal J V D?unuzovi? M Ki?anovi? V Vodnik M M Pergal S Jovanovi? |
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| Institution: | 1.ICTM-Center of Chemistry,University of Belgrade,Belgrade,Serbia;2.Holding Institute of General and Physical Chemistry,University of Belgrade,Belgrade,Serbia;3.Institute of Nuclear Science “Vin?a”,University of Belgrade,Belgrade,Serbia;4.Faculty of Chemistry,University of Belgrade,Belgrade,Serbia;5.Faculty of Technology and Metallurgy,University of Belgrade,Belgrade,Serbia |
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| Abstract: | Novel polyurethanes (PUs) were synthesized using hydroxy-terminated hyperbranched polyester (BH-20) and 4,4′-methylenediphenyl
diisocyanate (MDI) as hard segments and hydroxy-terminated ethylene oxide-poly(dimethylsiloxane)-ethylene oxide triblock copolymer
(PDMS-EO) as soft segment, with soft segment content ranging from 30 to 60 wt %. The PUs were synthesized by two-step solution
polymerization method. The influence of the soft segment content on the structure, swelling behavior and thermal properties
of PUs was investigated. According to the results obtained by swelling measurements, the increase of the hard segment content
resulted in the increase of the crosslinking density of synthesized samples. DSC results showed that the glass transition
temperatures increase from 36 to 65°C with increasing hard segment content. It was demonstrated using thermogravimetric analysis
(TGA) that thermal stability of investigated PUs increases with increase of the soft PDMS-EO content. This was concluded from
the temperatures corresponding to the 10 wt % loss, which represents the beginning of thermal degradation of samples. |
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