Dominant influence of the terminal molecule of PNIPA chain on wettability

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 de...

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Main Authors:	Nurul Huda, Mohd Rashid, Sultana, Nahida
Format:	Article
Language:	English
Published:	Penerbit Universiti Kebangsaan Malaysia 2017
Online Access:	http://journalarticle.ukm.my/10684/ http://journalarticle.ukm.my/10684/ http://journalarticle.ukm.my/10684/1/16%20Nurul%20Huda.pdf

id	ukm-10684
recordtype	eprints
spelling	ukm-106842017-09-20T09:14:09Z http://journalarticle.ukm.my/10684/ Dominant influence of the terminal molecule of PNIPA chain on wettability Nurul Huda, Mohd Rashid, Sultana, Nahida 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. Penerbit Universiti Kebangsaan Malaysia 2017-02 Article PeerReviewed application/pdf en http://journalarticle.ukm.my/10684/1/16%20Nurul%20Huda.pdf 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 http://www.ukm.my/jsm/english_journals/vol46num2_2017/contentsVol46num2_2017.html
repository_type	Digital Repository
institution_category	Local University
institution	Universiti Kebangasaan Malaysia
building	UKM Institutional Repository
collection	Online Access
language	English
description	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.
format	Article
author	Nurul Huda, Mohd Rashid, Sultana, Nahida
spellingShingle	Nurul Huda, Mohd Rashid, Sultana, Nahida Dominant influence of the terminal molecule of PNIPA chain on wettability
author_facet	Nurul Huda, Mohd Rashid, Sultana, Nahida
author_sort	Nurul Huda,
title	Dominant influence of the terminal molecule of PNIPA chain on wettability
title_short	Dominant influence of the terminal molecule of PNIPA chain on wettability
title_full	Dominant influence of the terminal molecule of PNIPA chain on wettability
title_fullStr	Dominant influence of the terminal molecule of PNIPA chain on wettability
title_full_unstemmed	Dominant influence of the terminal molecule of PNIPA chain on wettability
title_sort	dominant influence of the terminal molecule of pnipa chain on wettability
publisher	Penerbit Universiti Kebangsaan Malaysia
publishDate	2017
url	http://journalarticle.ukm.my/10684/ http://journalarticle.ukm.my/10684/ http://journalarticle.ukm.my/10684/1/16%20Nurul%20Huda.pdf
first_indexed	2023-09-18T19:58:12Z
last_indexed	2023-09-18T19:58:12Z
_version_	1777406671321038848

Dominant influence of the terminal molecule of PNIPA chain on wettability

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