Observation of phase transition of thermo-responsive poly(NIPA)-PEI block copolymers by STM

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dc.contributor.author Zareie, HM
dc.contributor.author Dincer, S
dc.contributor.author Piskin, E
dc.date.accessioned 2009-06-26T04:10:54Z
dc.date.issued 2002-01
dc.identifier.citation Journal of Colloid and Interface Science, 2002, 251 (2), pp. 424 - 428
dc.identifier.issn 0021-9797
dc.identifier.other C1UNSUBMIT en_US
dc.identifier.uri http://hdl.handle.net/10453/616
dc.description.abstract N-isopropylacrylamide (NIPA) homopolymers having carboxylic acid-end groups were synthesized by using mercaptoacetic acid (MAA) as the chain transfer agent. Polymerization was achieved in ethanol using azobisisobutyronitrile (AIBN) as the initiator. Average molecular weight of the homopolymer estimated by titration was 1958. This carboxylic acid-ended poly(NIPA) was then copolymerized with polyethylenimine (PEI, MW-2000) using a water soluble carbodiimide (EDAC). With respect to carboxyl-ended poly(NIPA), the block copolymers exhibited a pH dependent-temperature sensitivity and higher LCST values in acidic pH. Scanning tunneling microscopy (STM) images of both the homopolymer and the copolymer were obtained at 25 and 45°C with tip-sample bias voltages of up to 800 mV and tunneling currents not, vert, similar1 nA. These images showed that STM can be used to visualize both the formation of copolymer chains and their structure, and also their stimuli-responsive behavior.
dc.publisher Academic Press Inc Elsevier Science
dc.relation.isbasedon 10.1006/jcis.2002.8439
dc.title Observation of phase transition of thermo-responsive poly(NIPA)-PEI block copolymers by STM
dc.type Journal Article
dc.parent Journal of Colloid and Interface Science
dc.journal.volume 2
dc.journal.volume 251
dc.journal.number 2 en_US
dc.publocation USA en_US
dc.publocation Aldershot, UK
dc.identifier.startpage 424 en_US
dc.identifier.endpage 428 en_US
dc.cauo.name SCI.Physics and Advanced Materials en_US
dc.conference Verified OK en_US
dc.for 0303 Macromolecular and Materials Chemistry
dc.for 0306 Physical Chemistry (Incl. Structural)
dc.for 1007 Nanotechnology
dc.personcode 030414
dc.percentage 70 en_US
dc.classification.name Nanotechnology en_US
dc.classification.type FOR-08 en_US
dc.edition 1
dc.description.keywords carboxyl-ended N-isopropylacrylamide, polyethyl-enimine, cationic temperature sensitive copolymer, lower critical solution temperature, STM images
dc.description.keywords carboxyl-ended N-isopropylacrylamide, polyethyl-enimine, cationic temperature sensitive copolymer, lower critical solution temperature, STM images
pubs.embargo.period Not known
pubs.organisational-group /University of Technology Sydney
pubs.organisational-group /University of Technology Sydney/Faculty of Science
utslib.copyright.status Closed Access
utslib.copyright.date 2015-04-15 12:17:09.805752+10
utslib.copyright.date 2015-04-15 12:17:09.805752+10
pubs.consider-herdc false
pubs.consider-herdc false
utslib.collection.history General Collection (ID: 346) [2015-05-15T14:11:14+10:00]
utslib.collection.history School of Physics and Advanced Materials (ID: 343)
utslib.collection.history Closed (ID: 3)


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