Synthesis and thermal properties of polyurethane-polysiloxane crosslinked polymer networks

Abstract

Polysiloxane-polyurethane crosslinked polymer networks (PSI-PU) were synthesized in solution by polymerization of oligosiloxanes containing ␥-hydroxy propyl groups with polymethane polyphenyl polyisocyanate. Polyether-based polyurethane and polyester-based polyurethane were also prepared by a "one-shot" method. Their thermal properties were studied by thermogravimetric analysis. It was observed that the thermal stability of PSI-PU was better than that of polyether-based polyurethane and polyester-based polyurethane, and an inert atmosphere had no effect on decomposition of polyurethanes below 350°C. It was found that polyurethane-polysiloxane crosslinked polymer networks decomposed slower in oxygen than in nitrogen in the temperature range of 350 -550°C.

Synthesis and surface properties of polyurethane modified by polysiloxane

“…The polysiloxane modified polyurethane (Si-PU) obtained by incorporating siloxane units into the main chain of polyurethane possesses both the properties of polysiloxane and polyurethane. These properties do not only include good thermal stability, freeze resistance, hydrophobicity and insulativity, but also adequate flexibility, cohesiveness, wear resistance and surface property [4][5][6][7][8][9][10][11][12][13]. However, more siloxane components are needed to improve the surface property for this main chain type of Si-PU.…”

Broader Spectrum: Examples

“…Polyurethane -polysiloxane thermal stability is better than that of polyether -based polyurethane and polyester -based polyurethane. The inert atmosphere does not infl uence the decomposition of polyurethanes below 350 ° C. However, the decomposition nature of the polyurethane -polysiloxane crosslinked polymer network is low in oxygen compared to a nitrogen medium between 350 ° C and 550 ° C [37] .…”

Friction and Wear Behaviors of Two Kinds of Hydroxyl-Terminated Polydimethylsiloxane-Modified PU/EP IPN Composites Under Dry Sliding Conditions

“…Polydimethylsiloxane (PDMS) has many desirable features, such as high thermal and oxidative stabilities, and excellent moisture resistance [19]. In our pervious study [18], hydroxyl-terminated polydimethylsiloxane (HTPDMS)-modified PU/EP IPNs showed good damping, thermal, and mechanical properties, which could be used as structural damping materials.…”