Journal
INTERNATIONAL JOURNAL OF POLYMERIC MATERIALS AND POLYMERIC BIOMATERIALS
Volume 66, Issue 9, Pages 455-461Publisher
TAYLOR & FRANCIS AS
DOI: 10.1080/00914037.2016.1236340
Keywords
Aqueous ATRP; cloud point; PDMAEMA; stimuli-responsive behavior
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Poly(2-(dimethylamino)ethyl methacrylate) (PDMAEMA) samples were synthesized via aqueous atom transfer radical polymerization with DPn of 35, 151, 390, and 546 and dispersity of 1.13, 1.17, 1.20, and 1.18, respectively. All samples were exposed to temperature and pH variations at different concentration of polymer and salt (NaCl). Results indicated that cloud point (T-cl) can be controlled by changing DPn, polymer concentration, and ionic strength of solution. According to results, T-cl of the PDMAEMA chains shifted to lower temperatures with increasing solution pH at all molecular weight ranges due to deprotonation of tertiary amine groups in polymer structure. However, higher molecular weight polymers were more sensitive to pH variation especially in alkaline media. Also, higher polymer concentration acted as driving force to decrease cloud point of samples and formation of aggregates that was more predominant for higher molecular weights at alkaline media. T-cl of PDMAEMA chains decreased with increasing ionic strength even at low pH values for low molecular weight polymers.
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