Stimuli-Sensitive Behaviour of Binary Graft Co-polymers (PP-g-DMAEMA)-g-NIPAAm and (PP-g-4VP)-g-NIPAAm in Acidic and Basic Medium

Authors: Meléndez-Ortiz, Ivan H.¹; Bucio, Emilio²

Source: Designed Monomers & Polymers, Volume 12, Number 1, 2009 , pp. 99-108(10)

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Abstract:

The thermo-sensitive behaviour of the graft co-polymers (PP-g-DMAEMA)-g-NIPAAm and (PP-g-4VP)-g-NIPAAm, synthesized using gamma rays, was studied under basic and acidic conditions. Dependence of pH on the LCST value was also studied by measuring the swelling percentage at different temperatures. Both graft co-polymers were shown to have LCST and UCST behaviours. UCST behaviour was found at acidic pH for both co-polymers. Behaviour towards UCST or LCST transition of graft co-polymers was dependent of NIPAAm content in acidic medium below their pK_a. Response to pH was also studied at temperature above LCST.

Keywords: LCST; UCST; GRAFT CO-POLYMER

Document Type: Regular paper

DOI: http://dx.doi.org/10.1163/156855508X391167

Affiliations: 1: Departamento de Química de Radiaciones y Radioquímica, Instituto de Ciencias Nucleares, Universidad Nacional Autónoma de México, Circuito Exterior, Ciudad Universitaria, 04510 México D.F., México 2: Departamento de Química de Radiaciones y Radioquímica, Instituto de Ciencias Nucleares, Universidad Nacional Autónoma de México, Circuito Exterior, Ciudad Universitaria, 04510 México D.F., México;, Email: ebucio@nucleares.unam.mx

Publication date: 2009-01-01