A sample of polyN ethylmethacrylamide (PNEMAM) has a LCST of 58C. A mixture of linear PNEMAM with water when implanted inside the body will be a: a. clollapsed gel
b. solution
c. fully expanded gel
d. inverse micelle
e. semi-IPN

The correct answer is - c. fully expanded gel

Explanation:

PolyN ethylmethacrylamide (PNEMAM) is a negative temperature based hydrogel, these type of gels have LCST or lower critical solution temperature. Under the LCST this polymer get swollen and above the LCST it contracts.

In the question, it is mentioned that this hydrogel has a LCST of 58-degree celsius which is implanted in the human body that normally has a temperature of 37-degree celsius which is below the LCST so the polymer would expand or swell.

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