Study on the Properties of Siloxane‐Block Modified Polyester‐Based Polyurethane Elastomers

ABSTRACT A kind of polyurethane elastomer containing organosiloxane chain segments was obtained by in situ polymerization modification with hydroxy‐terminated organic siloxanes and polyurethane (OSPU) prepolymers. The results of infrared spectroscopy (IR) show that urethane‐based soft segment molecular chain segments were achieved from hydroxy‐terminated organic siloxanes (OHOS) by a feasible reaction, and scanning electron microscopy (SEM) results showed that significant microphase separation was observed in OSPU with increasing content of OHOS. When the OHOS content reached 30%, the comprehensive performance of OSPU was optimal. Among them, the hydrolytic resistance of OSPU improved up to 31.74%; and the water contact angle reached 103.9°, demonstrating excellent hydrolytic resistance and abrasion performance. On the other hand, the glass transition temperature of OSPU decreased to −35.8°C, which displayed excellent low‐temperature resistance. It provides a convenient synthetic strategy to meet the demand for industrialization of low‐temperature and hydrolytic resistance polyurethane materials.