High performance polyurethanes with extraordinary hydrolytic resistance prepared from bio-renewable alkyl-δ-lactones: Synthesis, properties and chemical recycling
Min Zhang , Qin Yan , Xinxin Yu , Yong Shen , Zhibo Li
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引用次数: 0
Abstract
Despite the great advancements achieved for the chemically recyclable polymers in recent years, it remains as a challenge to develop chemically recyclable polyurethanes from bio-renewable monomers with thermal and mechanical properties that compare with petroleum-based polyurethanes. In this contribution, we present the successful preparation of a series of chemically recyclable polyurethanes from the ring-opening polymerization of bio-renewable alkyl-δ-lactones followed by the tandem polycondensation with diisocyanate and a chain extender. The thermal and mechanical properties of the obtained polyurethanes can be easily tailored by adjusting the molar mass of soft segment, the hard segment content as well as the length of the pendent alkyl group of the poly(alkyl-δ-lactone) polyol precursor. The obtained polyurethanes behave as thermoplastic elastomers with excellent tensile strength and elasticity that compare with commodity petroleum-based polyurethanes. Remarkably, the obtained polyurethanes exhibit extraordinary hydrolytic resistance and remain intact up to 5 months in acidic or basic aqueous solution. The chemical recycling of polyurethanes to recover clean alkyl-δ-lactones with high yield (> 95 %) can be easily achieved by simple heating the materials in bulk under reduced pressure.
期刊介绍：
Polymer Degradation and Stability deals with the degradation reactions and their control which are a major preoccupation of practitioners of the many and diverse aspects of modern polymer technology.
Deteriorative reactions occur during processing, when polymers are subjected to heat, oxygen and mechanical stress, and during the useful life of the materials when oxygen and sunlight are the most important degradative agencies. In more specialised applications, degradation may be induced by high energy radiation, ozone, atmospheric pollutants, mechanical stress, biological action, hydrolysis and many other influences. The mechanisms of these reactions and stabilisation processes must be understood if the technology and application of polymers are to continue to advance. The reporting of investigations of this kind is therefore a major function of this journal.
However there are also new developments in polymer technology in which degradation processes find positive applications. For example, photodegradable plastics are now available, the recycling of polymeric products will become increasingly important, degradation and combustion studies are involved in the definition of the fire hazards which are associated with polymeric materials and the microelectronics industry is vitally dependent upon polymer degradation in the manufacture of its circuitry. Polymer properties may also be improved by processes like curing and grafting, the chemistry of which can be closely related to that which causes physical deterioration in other circumstances.
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