Surface Characterization of 2-Hydroxyethyl Methacrylate/Styrene Block Copolymers by Transmission Electron Microscopy Observation and Contact Angle Measurement

Senshu, Kazuhisa; Yamashita, Shuzo; Ito, Masumi; Hirao, Akira; Nakahama, Seiichi

doi:10.1021/la00006a070

Cited by 57 publications

(61 citation statements)

References 3 publications

(4 reference statements)

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“…35 In contrast, a number of studies have demonstrated that both low molecular weight PDMS and PEG can degrade and mineralize in soil via a combination of hydrolytic, oxidative, and microbial processes. [36][37][38][39][40][41] Therefore, to construct our amphiphilic polymers, we opted to link low molecular weight linear PDMS and PEG polyols (928.3 and 1020 g mol 21 , respectively) via hydrolytically sensitive urethane bonds. Thus, it was expected that our amphiphilic materials would ultimately undergo hydrolytic degradation to generate low molecular weight PDMS and PEG derivatives that could be subsequently mineralized in the soil environment.…”

Section: Resultsmentioning

confidence: 99%

“…17 Of particular interest are a group of environmentally responsive materials whose surfaces can switch between hydrophobic and hydrophilic character in response to the polarity of the medium in contact with the polymer surface. [18][19][20][21][22][23][24][25][26][27] Environmentally responsive polymer systems undergo surface rearrangements in response to the polarity of their surrounding environments to affect changes in their surface properties. 28 These responsive materials are amphiphilic in nature, comprising both hydrophobic and hydrophilic components that migrate Additional Supporting Information may be found in the online version of this article.…”

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confidence: 99%

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Hydrophobic‐hydrophilic surface switching properties of nonchain extended poly(urethane)s for use in agriculture to minimize soil water evaporation and permit water infiltration

Johnston

Freischmidt

Easton

et al. 2016

J of Applied Polymer Sci

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Preformed plastic films produced from nondegradable materials such as poly(ethylene) are widely used in agriculture to enhance crop production by modifying soil temperature, conserving soil water, and supressing weeds, but are generally removed and disposed of after each growing season. We aim to circumvent the need to retrieve and dispose of plastic films by using water‐borne, degradable polymers that can be sprayed directly onto the soil surface to form a barrier to reduce soil water evaporation. We report the synthesis and characterization of a series of nonchain extended poly(urethane)s (PUs) for this purpose, that were prepared from poly(dimethylsiloxane) (928.3 g mol−1) and poly(ethylene glycol) (1020 g mol−1). These new materials undergo hydrophobic‐hydrophilic switching of their surface properties when in contact with water, which we exploit as a means of minimizing water evaporation from soil when the polymer layer is dry (e.g., in sunny conditions), but permitting the infiltration of liquid water through the treatment into soil during rainfall or sprinkler irrigation. The surface wettability and restructuring phenomena leading to these fascinating properties are intensively investigated using water contact angle measurements, surface‐free energy estimates and depth profiling X‐ray photoelectron spectroscopy (XPS). Laboratory pot trials demonstrate that soil water evaporation reduced by more than 70% when soil was treated with a low loading of the polymer. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 134, 44756.

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Section: Resultsmentioning

confidence: 99%

mentioning

confidence: 99%

Hydrophobic‐hydrophilic surface switching properties of nonchain extended poly(urethane)s for use in agriculture to minimize soil water evaporation and permit water infiltration

Johnston

Freischmidt

Easton

et al. 2016

J of Applied Polymer Sci

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“…PMPCb-PDMS-V (see Table I) was then morphologically analyzed with a TEM in order to confirm such a structure after staining the sliced surface of the sample with Ru0 4 vapor. PMPC-b-PDMS-V was found to have a microphase separated structure 15 with the domain size ranging from several ten to several hundred nanometers, as shown in Figure 2.…”

Section: Synthesis and Characterization Of Pmpc-b-pdmsmentioning

confidence: 99%

“…It is noteworthy that PMPC-b-PDMS effectively suppresses the adsorption of Fib, which is recognized as an important blood coagulation factor. 15 Blood compatibility was also evaluated by the adhesion of human platelets. Figure 4 exhibits the SEM micrograph of PMPC-b-PDMS-V after contact with PRP for 180min, together with the case of silicone rubber as a control.…”

Section: Pdms-b-pmpc-vmentioning

confidence: 99%

Biocompatible Block Copolymers Composed of Polydimethylsiloxane and Poly[(2-methacryloyloxy)ethyl phosphorylcholine] Segments

Sugiyama

Shiraishi

Okada

et al. 1999

Polym J

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“…16,17 Senshu et al 16 successfully prepared nanostructured thin films of PHEMA-b-PS-b-PHEMA triblock copolymers, which upon casting from tetrahydrofuran (THF) and N,N-dimethylformamide (DMF) assembled to produce lamellae and hexagonal morphologies of PS cylinders dispersed in a PHEMA matrix, in spite of the fact that only the former phase is anticipated on the basis of the volume fraction of PS and theoretical phase diagrams. These authors also showed that the surface of as-cast films can be reversibly reconstructed by exposing samples to dry/wet conditions using water as solvent and thermal annealing.…”

Section: Introductionmentioning

confidence: 99%

Nanostructure of polystyrene-b-poly(2-hydroxyethyl methacrylate) and derivatives with phosphonic diacid groups

Schmidt

Giacomelli

2012

J. Braz. Chem. Soc.

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A engenharia de superfícies para o posicionamento de biomoléculas é uma etapa fundamental para a produção de biochips. Neste estudo, descreve-se uma nova estratégia para a preparação de nanodomínios contendo grupos ácido fosfônicos, os quais se ligam a uma família de proteínas (anexinas), de forma reversível em função da presença de íons cálcio. A abordagem desenvolvida consistiu no uso de precursores de poliestireno-b-poli(metacrilato de 2-hidroxietila) (PS-b-PHEMA) sintetizados por polimerização radicalar por transferência de átomos (ATRP) para a obtenção de cilindros de PS (f PS = 0.25-0.27) dispostos em morfologia hexagonal numa matriz de PHEMA. Os grupos hidroxila pendentes do PHEMA foram, em seguida, parcialmente (20%) convertidos em grupos ácido fosfônicos por reações sequenciais de fosforilação, sililação e metanólise. Este processo produziu derivados PS-b-P(HEMA-co-PEMA) que retêm a morfologia hexagonal, embora o grau de organização estrutural seja menor em relação aos precursores.Surface engineering for precise positioning of biomolecules is of particular interest for controlled fabrication of biochips. In this study, a novel approach for the preparation of nanodomains with phosphonic diacid groups that were previously shown to reversibly bind to a family of proteins (annexins) in a calcium-dependent manner is described. The strategy makes use of polystyreneb-poly(2-hydroxyethyl methacrylate) (PS-b-PHEMA) precursors prepared by atom transfer radical polymerization (ATRP) to obtain hexagonally packed PS cylinders (f PS = 0.25-0.27) in a PHEMA matrix. The pendant hydroxyl groups of PHEMA are then partially (ca. 20%) converted into phosphonic diacid groups via sequential reactions involving phosphorylation, silylation and methanolysis. This process produces PS-b-P(HEMA-co-PEMA) derivatives that still retain the hexagonal morphology, but their degree of structural organization is reduced comparatively to the precursors.

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Surface Characterization of 2-Hydroxyethyl Methacrylate/Styrene Block Copolymers by Transmission Electron Microscopy Observation and Contact Angle Measurement

Cited by 57 publications

References 3 publications

Hydrophobic‐hydrophilic surface switching properties of nonchain extended poly(urethane)s for use in agriculture to minimize soil water evaporation and permit water infiltration

Hydrophobic‐hydrophilic surface switching properties of nonchain extended poly(urethane)s for use in agriculture to minimize soil water evaporation and permit water infiltration

Biocompatible Block Copolymers Composed of Polydimethylsiloxane and Poly[(2-methacryloyloxy)ethyl phosphorylcholine] Segments

Nanostructure of polystyrene-b-poly(2-hydroxyethyl methacrylate) and derivatives with phosphonic diacid groups

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