Overview
Isopropylacrylamide (NIPAM) is a versatile monomer primarily known for its thermosensitive properties. It polymerizes to form poly(N-isopropylacrylamide) (PNIPAM), a widely studied smart material with a lower critical solution temperature (LCST) near 32°C in water. This unique behavior makes it invaluable in biomedical and materials science applications. First synthesized in the mid-20th century, NIPAM has become a cornerstone in responsive polymer research. Its ability to undergo reversible phase transitions with temperature changes enables precise control in drug delivery systems, tissue engineering scaffolds, and sensor technologies.
Physical and Chemical Properties
NIPAM appears as a white crystalline solid with moderate solubility in polar solvents. Its molecular structure contains both hydrophilic (amide group) and hydrophobic (isopropyl group) components, contributing to its LCST behavior. Below 32°C, PNIPAM is water-soluble; above this temperature, it becomes hydrophobic and precipitates. The compound's melting point ranges between 60-65°C, and it should be protected from light and moisture to prevent degradation. NIPAM's reactivity stems from its vinyl group, allowing free radical polymerization with initiators like APS or AIBN. These properties make it particularly useful for creating crosslinked hydrogels with tunable swelling characteristics.
Main Applications
NIPAM's primary application lies in temperature-responsive polymers for biomedical uses. PNIPAM-based hydrogels serve as smart drug carriers that release payloads at specific body temperatures. They're also employed in tissue engineering scaffolds that change stiffness in response to physiological conditions. In industrial settings, NIPAM derivatives create switchable surfaces for filtration membranes and sensors. The material's rapid phase transition enables applications in microfluidics and lab-on-a-chip devices. Recent research explores its potential in agricultural delivery systems and responsive coatings for textiles.
Safety and Storage
As a reactive monomer, NIPAM requires careful handling. It may cause skin and eye irritation, necessitating gloves, goggles, and proper ventilation. The powder should be stored in airtight containers at room temperature, protected from moisture and direct sunlight to prevent polymerization or degradation. In case of exposure, immediately flush affected areas with water. For laboratory use, incorporate inhibitors like MEHQ (typically 100-200 ppm) to prevent unwanted polymerization during storage. Large-scale industrial users should maintain temperature-controlled storage facilities and conduct regular stability testing.
B2B Procurement Guide
When sourcing NIPAM, prioritize suppliers with certified purity analysis (typically 98-99.5%). Pharmaceutical-grade material requires additional documentation like residual solvent profiles and heavy metal content certificates. Consider packaging options - small quantities often come in glass bottles, while bulk orders use polyethylene-lined drums. Lead times vary by quantity; specialty grades may require 4-8 weeks for synthesis and testing. For research institutions, 100g to 1kg quantities are commonly stocked. Industrial buyers should negotiate long-term supply agreements due to potential raw material fluctuations. Always verify the inhibitor type and concentration matches your polymerization requirements.
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