Surface free energies of styrene-acrylic acid copolymer plates prepared in various frames

Tsuchida, Masaki; Osawa, Zenjiro

doi:10.1007/bf00658846

Cited by 4 publications

(3 citation statements)

References 18 publications

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“…After deprotection, the system exhibited a surface perpendicular orientation as evidenced by the cylindrical morphology found using AFM. A transition in surface energetics contributed to this morphological shift as the surface energy of the deprotected PAH block (the hydrated analogue of PAH is PAA and has a surface energy in the range of 50 mJ/m 2 to 68 mJ/m 2 ) , exceeds that of the PS block. The lower surface energy of PS thus favors expression of the PS block at the air interface.…”

Section: Resultsmentioning

confidence: 99%

Investigation of Thermally Responsive Block Copolymer Thin Film Morphologies Using Gradients

Kelly

Albert

Howarter

et al. 2010

ACS Appl. Mater. Interfaces

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We report the use of a gradient library approach to characterize the structure and behavior of thin films of a thermally responsive block copolymer (BCP), poly(styrene-b-tert-butyl acrylate) (PS-b-PtBA), which exhibits chemical deprotection and morphological changes above a thermal threshold. Continuous gradients in temperature and film thickness, as well as discrete substrate chemistry conditions, were used to examine trends in deprotection, nanoscale morphology, and chemical structure. Thermal gradient annealing permitted the extraction of transformation rate constants (k(t)) for the completion of thermal deprotection and rearrangement of the film morphology from a single BCP library on hydroxyl and alkyl surfaces, respectively. The transformation rate constants ranged from 1.45 × 10(-4) s(-1) to 5.02 × 10(-5) s(-1) for temperatures between 185 and 140 °C for hydroxyl surfaces. For the same temperature range, the alkyl surfaces yielded k(t) values ranging from 4.76 × 10(-5) s(-1) to 5.73 × 10(-6) s(-1), an order of magnitude slower compared to hydroxyl surfaces. Activation energies of the thermal deprotection and film transformation on these surfaces were also extrapolated from linear fits to Arrhenius behavior. Moreover, we noted a morphology shift and orientation transformation from parallel lamellae to perpendicular cylinders at the free surface because of changes in volume fraction and surface energetics of the initially symmetric BCP. Using gradient techniques, we are able to correlate morphological and chemical structure changes in a rapid fashion, determine kinetics of transitions, and demonstrate the effect of surface chemistry on the deprotection reaction in thermally responsive BCP thin films.

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Section: Resultsmentioning

confidence: 99%

Investigation of Thermally Responsive Block Copolymer Thin Film Morphologies Using Gradients

Kelly

Albert

Howarter

et al. 2010

ACS Appl. Mater. Interfaces

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“…Following the same reasoning but replacing the titanium dioxide interface by the protective copolymer layer we get to the same conclusion (S > 0). Given that the surface energy of the copolymer protective layer is larger than that of the siloxane residue γ PAA/air ~ 50–68 mN/m [30,31]; and the interfacial energy between the siloxane residues and the polyacrylic acid is below γ PAA/Siloxane ~0.1 mN/m [32]. Thus spreading of the hydrophobic residues is expected to occur on the protective coating.…”

Section: Resultsmentioning

confidence: 99%

Thin film of Poly(acrylic acid-co-allyl acrylate) as a Sacrificial Protective Layer for Hydrophilic Self Cleaning Glass

et al. 2010

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Poly(acrylic acid-co-allyl acrylate) statistical copolymers were synthesized in a controlled manner in two steps: first tert.butyl acrylate and allyl acrylate were polymerized via atom transfer radical polymerization (ATRP) and afterwords the tert.butyl protective groups were removed via hydrolysis. Samples of self cleaning glass (SCG) were coated with thin films of poly(acrylic acid-co-allyl acrylate) and cross-linked afterwards by UV irradiation (in the presence of a photoinitiator and an accelerator). Solution cast thin films were transparent and homogeneous before and after UV cross-linking. The irradiated samples were found to be hydrophilic (Θ < 20°) and water insoluble. The coating prevented the spontaneous hydrophobization of the SCG by residual silicon exhaled from the sealing material. The TiO2 photocatalyst that covers the glass surface was found to strip the protective coating. The rate of the photooxidation process was measured by IR spectroscopy. The real field performance of the protective coating was also tested.

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“…We have already reported the changes in surface characteristics of several O 2 -plasma-treated polymers during aging (14,15). However, the dynamic behavior of the oxygencontaining functional groups introduced into the polymer main chain has not been clearly distinguished from the diffusion of the low-molecular-weight compounds formed by the plasma treatment.…”

Section: X-ray Photoelectron Spectroscopy Analysis Oxygen Plasma Treamentioning

confidence: 95%

Dynamics of Polymeric Solid Surfaces Treated with Oxygen Plasma: Effect of Aging Media after Plasma Treatment

Murakami

Kuroda

Osawa

1998

Journal of Colloid and Interface Science

162

136

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Surface free energies of styrene-acrylic acid copolymer plates prepared in various frames

Cited by 4 publications

References 18 publications

Investigation of Thermally Responsive Block Copolymer Thin Film Morphologies Using Gradients

Investigation of Thermally Responsive Block Copolymer Thin Film Morphologies Using Gradients

Thin film of Poly(acrylic acid-co-allyl acrylate) as a Sacrificial Protective Layer for Hydrophilic Self Cleaning Glass

Dynamics of Polymeric Solid Surfaces Treated with Oxygen Plasma: Effect of Aging Media after Plasma Treatment

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