Overview
Hydrolyzable polyurethane is a functional polymer engineered to degrade predictably when exposed to water or moisture. Unlike conventional polyurethanes, it incorporates ester or carbonate linkages in its backbone, which are susceptible to hydrolysis. This property makes it valuable for applications requiring temporary structural support or controlled release. Developed initially for biomedical uses, such as absorbable sutures, its applications now span construction (temporary sealants), agriculture (biodegradable mulch films), and environmental remediation. The degradation rate can be tailored from weeks to years by adjusting the polymer's chemical composition and crosslinking density.
Physical and Chemical Properties
Hydrolyzable polyurethanes exhibit a balance of mechanical strength and degradation kinetics. Typical tensile strength ranges from 5–50 MPa, depending on formulation. The material transitions from rigid to brittle as hydrolysis progresses, losing 50–90% of its strength over the degradation period. Key chemical features include hydrolytically labile bonds (e.g., ester groups) and often hydrophilic segments like polyethylene glycol (PEG). Degradation products are usually small molecules (e.g., diols, diamines) that are non-toxic and metabolizable in biological systems. The rate of hydrolysis accelerates in alkaline or acidic environments, allowing further control in industrial settings.
Main Applications
In the medical field, hydrolyzable polyurethanes are used for absorbable implants, drug-eluting stents, and wound dressings. Their biocompatibility and predictable degradation minimize secondary removal surgeries. Construction industries employ them as temporary waterproofing membranes or sacrificial molds for concrete, where they degrade after curing. Environmental applications include biodegradable fishing nets and agricultural films that reduce microplastic pollution. Recent R&D focuses on 3D-printed scaffolds for tissue engineering, leveraging their tunable porosity and degradation to match tissue growth rates.
Safety and Storage
Pre-polymer forms may contain isocyanates, requiring handling with gloves and ventilation. Fully cured products are generally inert but should be stored in moisture-proof packaging to prevent premature degradation. Dust from machining may irritate lungs—use PPE during processing. Degradation products are typically non-hazardous, but industrial-scale disposal should comply with local regulations. Incineration is avoided due to potential cyanide release; composting or enzymatic digestion is preferred for biodegradable grades.
B2B Procurement Guide
When sourcing hydrolyzable polyurethane, specify the target degradation time (e.g., 3 months for crop films vs. 12 months for medical devices). Request certificates for ISO 10993 (biocompatibility) or ASTM D6400 (compostability) if applicable. Bulk pricing drops significantly at orders >1 ton. Lead times vary (2–8 weeks) due to custom formulations. Preferred suppliers include Lubrizol (medical grades) and BASF (industrial grades). For prototyping, consider pellet or liquid prepolymer forms from smaller manufacturers like AdvanSource Biomaterials.
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