Dominant influence of the terminal molecule of PNIPA chain on wettability

Nurul Huda, and Mohd Rashid, and Sultana, Nahida (2017) Dominant influence of the terminal molecule of PNIPA chain on wettability. Sains Malaysiana, 46 (2). pp. 309-315. ISSN 0126-6039


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Poly(N-isopropylacrylamide) (PNIPA) brushes on silicon substrate was constructed and molecular weight and polydispersity index was controlled precisely. Molecular behavior of the PNIPA grafted surface was observed by using captive bubble contact angle method. A very interesting phenomenon of high density PNIPA grafted membrane with a chloride terminal molecule was observed. The contact angle of high density PNIPA-Cl increased sharply while the temperature rises above 32oC. But in the case of PNIPA gel surface the contact angle result decreases sharply while the temperature reaches above lower critical solution temperature (LCST). In order to identify the reason behind this abnormal behavior of PNIPA-Cl grafted membrane, the terminal chloride molecule of PNIPA chain was modified to less electronegative azide (-N3) as well as carboxylic acid (-COOH). Finally it was found that terminal molecule of high density PNIPA grafted membrane has a great influences on the wettability change of PNIPA membrane in water by changing the temperature.

Item Type:Article
Keywords:ATRP; Grafted membrane; Monomer; PNIPA
Journal:Sains Malaysiana
ID Code:10684
Deposited By: ms aida -
Deposited On:18 Sep 2017 06:42
Last Modified:20 Sep 2017 09:14

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