A new, highly stable cationic-thermosensitive microgel: Uniform isopropylacrylamide-dimethylaminopropylmethacrylamide copolymer particles

Eke, Irem; Elmas, Begum; Tuncel, KADRİYE; Tuncel, SÜLEYMAN

doi:10.1016/j.colsurfa.2006.01.011

A new, highly stable cationic-thermosensitive microgel: Uniform isopropylacrylamide-dimethylaminopropylmethacrylamide copolymer particles

Atıf İçin Kopyala

Eke I., Elmas B., Tuncel M., Tuncel A.

COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS, cilt.279, ss.247-253, 2006 (SCI-Expanded)

Yayın Türü: Makale / Tam Makale
Cilt numarası: 279
Basım Tarihi: 2006
Doi Numarası: 10.1016/j.colsurfa.2006.01.011
Dergi Adı: COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
Sayfa Sayıları: ss.247-253
Hacettepe Üniversitesi Adresli: Evet

Özet

New monodisperse, thermosensitive, cationic microgel particles up to 1930 +/- 56 nm in size were obtained by the dispersion copolymerization of N-isopropylacrylamide (NIPA) and N-3-dimethyl-aminopropylmethacrylamide (DMAPM). In the developed protocol, an amide based comonomer. DMAPM was tried as a new alternative material for introducing positive charge to the thermosensitive microgel. Poly(NIPA-co-DMAPM) microgel exhibited pH-sensitivity and the particle size linearly decreased with increasing pH. Poly(NIPA-co-DMAPM) microgel synthesized without making any pH adjustment in the aqueous medium exhibited colloidal stability between pHs 3 and 10 while similar cationic microgels were reported to be unstable at pHs higher than 6. The stronger cationic character of selected comonomer originated from its amide based structure (i.e. higher pK(a) of DMAPM) provided higher colloidal stability to the poly(NIPA-co-DMAPM) microgel.