NDLI: Charges of soluble amphiphiles and particles: random and diblock copolymerizations of MAA/AAm, MAA/St, and MAA/4VP in ethanol

Content Provider	Springer Nature Link
Author	Zhan, Kan Zhang, Hui Li, Min Chen, Yulu Chen, Guoxia Liu, Junxiu Wu, Min Ni, Henmei
Copyright Year	2014
Abstract	Random and reversible addition-fragmentation chain transfer (RAFT) copolymerizations of methacrylic acid (MAA)/acrylamide (AAm), MAA/styrene (St), and MAA/4-vinyl pyridine (4VP) were carried out in ethanol. (CPDB)-terminated PMAA (PMAA-CPDB) and 2,2′-azobis(2,4-diemthylvaleronitrile) (V-65) was used as the macromolecular chain transfer agent (CTA) and initiator, respectively. Electric conductivity of copolymerization systems was traced throughout the polymerizations, and charges of soluble copolymer and particles were detected. As a result, a considerable increase of conductivity was observed in all of the RAFT polymerization systems, whereas the variation of conductivity in the random copolymerization systems was insignificant. The high conductivity of RAFT polymerization was dominantly contributed by the soluble diblock copolymers in the serum, rather than their particles, except for P(MAA-b-4VP) where only the particles was obtained due to the zwitterionic interactions of PMAA segments and 4VP. In the direct current (DC) field, the behavior of these soluble diblock copolymers, P(MAA-b-AAM) and P(MAA-b-St), indicated that they were positively charged, whereas the particles of (PMAA-b-AAm) and P(MAA-b-4VP) were surprisingly negatively charged, though the composition of MAA was dominant. Soluble random copolymers of P(MAA-co-St) and P(MAA-co-4VP) represented the charge neutrality. These results indicated that the positive charges were contributed by the solvophobic block in the soluble diblock copolymers. Therefore, the diblock copolymers were the macrodipoles boosting the conductivity of solution. Meanwhile, it indicated that the electrostatic interactions of dipoles were possibly the main driving force of their self-assembly. Generally, compared with RAFT polymerization, the particles were hard to be prepared in the random copolymerization. It implies that the electrostatic interactions of diblock copolymers also played an important role in the particle formation. Figure In ethanol, the soluble diblock copolymers of P(MAA-co-X) (X = AAm, St) and particles of P(MAA-co-4VP) were positively charged, though the component of MAA was dominant. The particles of P(MAA/AAm) were negatively charged and particles of P(MAA-co-St) were charge neutrality. The soluble random copolymers generally were charge neutrality. It was relatively difficult to prepare particles by random copolymerization. These results indicated that the electrostatic interactions played an important role on the self-assembly and particle formation
Starting Page	1553
Ending Page	1565
Page Count	13
File Format	PDF
ISSN	0303402X
Journal	Colloid and Polymer Science
Volume Number	292
Issue Number	7
e-ISSN	14351536
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2014-04-11
Publisher Place	Berlin/Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Electric conductivity Amphiphilic diblock copolymer Self-assembly Poly(methacrylic acid) Polymer Sciences Soft and Granular Matter, Complex Fluids and Microfluidics Characterization and Evaluation of Materials Physical Chemistry Food Science Nanotechnology and Microengineering
Content Type	Text
Resource Type	Article
Subject	Colloid and Surface Chemistry Materials Chemistry Physical and Theoretical Chemistry Polymers and Plastics

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