Observation of Phase Transition of Thermo-Responsive Poly(NIPA)–PEI Block Copolymers by STM
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 estima...
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| Veröffentlicht in: | Journal of colloid and interface science 2002-07, Vol.251 (2), p.424-428 |
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| container_end_page | 428 |
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| container_issue | 2 |
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| container_title | Journal of colloid and interface science |
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| creator | Zareie, M.Hadi Dinçer, Sevil Pişkin, Erhan |
| description | 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 ∼1 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. |
| doi_str_mv | 10.1006/jcis.2002.8439 |
| format | Article |
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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 ∼1 nA. 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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 ∼1 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.</description><subject>Acrylamides - chemistry</subject><subject>Applied sciences</subject><subject>carboxyl-ended N-isopropylacrylamide</subject><subject>cationic temperature sensitive copolymer</subject><subject>Exact sciences and technology</subject><subject>Hot Temperature</subject><subject>Hydrogen-Ion Concentration</subject><subject>lower critical solution temperature</subject><subject>Organic polymers</subject><subject>Phase Transition</subject><subject>Physicochemistry of polymers</subject><subject>polyethyl-enimine</subject><subject>Polymers - chemical synthesis</subject><subject>Polymers - chemistry</subject><subject>Polymers with particular properties</subject><subject>Preparation, kinetics, thermodynamics, mechanism and catalysts</subject><subject>STM images</subject><subject>Thioglycolates - chemistry</subject><issn>0021-9797</issn><issn>1095-7103</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2002</creationdate><recordtype>article</recordtype><sourceid>EIF</sourceid><recordid>eNp1kLtOwzAUhi0EouWyMqIsIBhSbKeO7REqLpUKVFBGZLnOiTAkdbHbSt14B96QJ8FRC0xMlv7z-dc5H0IHBHcIxvnZq7GhQzGmHdHN5AZqEyxZygnONlE7xiSVXPIW2gnhFWNCGJPbqEVyKjHvyjZ6vh8H8As9s26SuDIZvugAycjrSbA_2egFfO3SBwhTF-MFJENXLU_u-sPz06-Pz-FlP7monHlLem4aBzX4kIyXyePodg9tlboKsL9-d9HT1eWod5MO7q_7vfNBaqhgs5QB5IxzUghKaAZUamiuEdpgllOgpNA8z5gERnIpCi5kF5csjoqSC85MtouOV71T797nEGaqtsFAVekJuHlQnEoqCJMR7KxA410IHko19bbWfqkIVo1Q1QhVjVDVrBA_HK6b5-Maij98bTACR2tAB6OrMpprGn65TNCM0TxyYsVB9LCw4FUwFiYGCuvBzFTh7H87fAOV0pCP</recordid><startdate>20020715</startdate><enddate>20020715</enddate><creator>Zareie, M.Hadi</creator><creator>Dinçer, Sevil</creator><creator>Pişkin, Erhan</creator><general>Elsevier Inc</general><general>Elsevier</general><scope>IQODW</scope><scope>CGR</scope><scope>CUY</scope><scope>CVF</scope><scope>ECM</scope><scope>EIF</scope><scope>NPM</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7X8</scope></search><sort><creationdate>20020715</creationdate><title>Observation of Phase Transition of Thermo-Responsive Poly(NIPA)–PEI Block Copolymers by STM</title><author>Zareie, M.Hadi ; Dinçer, Sevil ; Pişkin, Erhan</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c285t-5ee65771d82123e29ae84398ac0562e21da76359e51698d78940f5562df7875c3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2002</creationdate><topic>Acrylamides - chemistry</topic><topic>Applied sciences</topic><topic>carboxyl-ended N-isopropylacrylamide</topic><topic>cationic temperature sensitive copolymer</topic><topic>Exact sciences and technology</topic><topic>Hot Temperature</topic><topic>Hydrogen-Ion Concentration</topic><topic>lower critical solution temperature</topic><topic>Organic polymers</topic><topic>Phase Transition</topic><topic>Physicochemistry of polymers</topic><topic>polyethyl-enimine</topic><topic>Polymers - chemical synthesis</topic><topic>Polymers - chemistry</topic><topic>Polymers with particular properties</topic><topic>Preparation, kinetics, thermodynamics, mechanism and catalysts</topic><topic>STM images</topic><topic>Thioglycolates - chemistry</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Zareie, M.Hadi</creatorcontrib><creatorcontrib>Dinçer, Sevil</creatorcontrib><creatorcontrib>Pişkin, Erhan</creatorcontrib><collection>Pascal-Francis</collection><collection>Medline</collection><collection>MEDLINE</collection><collection>MEDLINE (Ovid)</collection><collection>MEDLINE</collection><collection>MEDLINE</collection><collection>PubMed</collection><collection>CrossRef</collection><collection>MEDLINE - Academic</collection><jtitle>Journal of colloid and interface science</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Zareie, M.Hadi</au><au>Dinçer, Sevil</au><au>Pişkin, Erhan</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Observation of Phase Transition of Thermo-Responsive Poly(NIPA)–PEI Block Copolymers by STM</atitle><jtitle>Journal of colloid and interface science</jtitle><addtitle>J Colloid Interface Sci</addtitle><date>2002-07-15</date><risdate>2002</risdate><volume>251</volume><issue>2</issue><spage>424</spage><epage>428</epage><pages>424-428</pages><issn>0021-9797</issn><eissn>1095-7103</eissn><coden>JCISA5</coden><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 ∼1 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.</abstract><cop>San Diego, CA</cop><pub>Elsevier Inc</pub><pmid>16290749</pmid><doi>10.1006/jcis.2002.8439</doi><tpages>5</tpages></addata></record> |
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| subjects | Acrylamides - chemistry Applied sciences carboxyl-ended N-isopropylacrylamide cationic temperature sensitive copolymer Exact sciences and technology Hot Temperature Hydrogen-Ion Concentration lower critical solution temperature Organic polymers Phase Transition Physicochemistry of polymers polyethyl-enimine Polymers - chemical synthesis Polymers - chemistry Polymers with particular properties Preparation, kinetics, thermodynamics, mechanism and catalysts STM images Thioglycolates - chemistry |
| title | Observation of Phase Transition of Thermo-Responsive Poly(NIPA)–PEI Block Copolymers by STM |
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