PNIPAAm (poly(N-isopropylacrylamide)) is a synthetic polymer known for its sharp, reversible lower critical solution temperature (LCST) phase transition around 32°C, meaning it switches between hydrophilic and hydrophobic states in response to temperature changes. This thermoresponsive behavior makes it valuable in biomedical and pharmaceutical applications where controlled release, cell culture, or targeted delivery is needed; it is also investigated for smart coatings, separation systems, and biosensors. Unlike conventional polymers with fixed properties, PNIPAAm's stimuli-responsive nature allows engineers to design systems that actively respond to environmental conditions, though it remains primarily used in research and specialized biotech applications rather than high-volume industrial manufacturing.
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| Property | Value | Unit | Conditions | Source | |
|---|---|---|---|---|---|
Compressive Strength(σc) | 0.06659 | ksi | — | ||
Elongation at Break(εf) | 364.7 | - | — | ||
Ultimate Tensile Strength(σUTS) | 1.278 | ksi | — | ||
Young's Modulus(E) | 0.5729 | ksi | — |
| Property | Value | Unit | Conditions | Source | |
|---|---|---|---|---|---|
Glass Transition Temperature(Tg) | 272.7 | °F | — | ||
Melting Point / Solidus(Tm) | 230.8 | °F | — | ||
Maximum Service Temperature(Tmax) | 726.1 | °F | — |
| Property | Value | Unit | Conditions | Source | |
|---|---|---|---|---|---|
Refractive Index(n) | 1.439 | - | — |