Tacticity Effects on the Phase Diagram for Poly(<i>N</i>-isopropylacrylamide) in Water

Katsumoto, Yukiteru; Kubosaki, Noriyuki

doi:10.1021/ma800881r

Cited by 76 publications

(100 citation statements)

References 18 publications

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“…The T c of the aqueous solution of PNdEAm increases with increasing m content as reported previously [10]. The tacticity dependence of T c for PNEAm, on the other hand, is similar to that observed for PNiPAm [12], which is opposite to that for PNdEAm. These results indicate that an isotactic-rich PNdEAm is hydrophilic, whereas an isotactic-rich PNEAm is hydrophobic.…”

Section: Introductionsupporting

confidence: 86%

“…The co-solvent effect on the phase behaviour of PNiPAm is different from that of PNdEAm; the addition of methanol to the aqueous solutions causes the rise of the cloud point (T c ) for PNdEAm [7], but the decrease of T c for PNiPAm [8]. The tacticity dependence of T c is also opposite for these two polymers: The increase of the meso diad (m) fraction in the polymer chain causes the rise of T c for PNdEAm [9,10], but the decrease of T c for PNiPAm [11,12]. These phenomena cannot be explained only by taking account of the interaction between the side chain and water, and thus we have to also consider the contribution of the intramolecular interaction among the side chains [13].…”

Section: Introductionmentioning

confidence: 99%

“…N,N-dietylacrylamide was kindly provided by Kojin and purified by distillation under reduced pressure. The polymerizations were carried out in the absence or presence of Yttrium(III) trifluoromethanesulfonate (Y(OTf) 3 Lewis acid) [12,16]. Chemical structures of PNEAm and PNdEAm were shown in figure 1.…”

Section: Introductionmentioning

confidence: 99%

“…The weight-average molecular weight (M w ) and polydispersity (M w /M n ) were determined by a size exclusion chromatography. The m content was determined by 1 H NMR [12,16,17]. The cloud point (T c ) of a 1 wt % aqueous solution was estimated by the transmittance curve [12].…”

Section: Introductionmentioning

confidence: 99%

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Water sorption on a thin film of stereocontrolled poly(N-ethylacrylamide) and poly(N,N-diethylacrylamide)

Tsuchiizu

Hasegawa

Katsumoto

2013

MATEC Web of Conferences

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Abstract. The tacticity effects on the water-vapor sorption of the thin films of poly(N-ethylacrylamide) (PNEAm) and poly(N,N-diethylacrylamide) (PNdEAm) are investigated by the quartz crystal microbalance method and infrared spectroscopy. The quantity of sorbed water on the spin-coated films of isotactic-rich PNEAm is larger than that of atactic one. For PNdEAm, the syndiotactic-rich polymer film absorbs more water. The amide I or C=O stretching band of the polymers are monitored during water sorption on the spin-coated films. The result indicates that the water-sorption site is also influenced by the tacticity of the polymers. The annealing of these films wipes out the tacticity dependence of water sorption, indicating that the water-sorption sites in the spin-coated films are voids around C=O groups that are made by evaporation of solvent during spin-coating (so-called, the "solvent-imprint" effect). The isotactic-rich PNEAm is more influenced by the solvent-imprint effect than the syndiotactic-rich one, while an opposite tendency is found for PNdEAm.

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Section: Introductionsupporting

confidence: 86%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Water sorption on a thin film of stereocontrolled poly(N-ethylacrylamide) and poly(N,N-diethylacrylamide)

Tsuchiizu

Hasegawa

Katsumoto

2013

MATEC Web of Conferences

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“…r was in the range 53 % (no Y(OTf) 3 ) to 12 % (0.266 M Y(OTf) 3 ). Katsumoto et al [284] prepared poly(DEAm)s with differing tacticity by RAFT polymerization in the presence of Y(OTf) 3 or Sc(OTf) 3 .…”

Section: Control Of Stereochemistry In Raft Polymerizationmentioning

confidence: 99%

Living Radical Polymerization by the RAFT Process – A Third Update

2012

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This paper provides a third update to the review of reversible deactivation radical polymerization (RDRP) achieved with thiocarbonylthio compounds (ZC(¼S)SR) by a mechanism of reversible addition-fragmentation chain transfer ( Chem. 2009Chem. , 62, 1402. This review cites over 700 publications that appeared during the period mid 2009 to early 2012 covering various aspects of RAFT polymerization which include reagent synthesis and properties, kinetics and mechanism of polymerization, novel polymer syntheses, and a diverse range of applications. This period has witnessed further significant developments, particularly in the areas of novel RAFT agents, techniques for end-group transformation, the production of micro/nanoparticles and modified surfaces, and biopolymer conjugates both for therapeutic and diagnostic applications.

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