Mussel inspired locomotive: the moisture induced actuation in a poly(vinyl alcohol) film containing melanin-like dopamine nano spheres

Poly(vinyl alcohol) (PVA) supramolecular networks cross-linked by ureido-pyrimidinone (UPy) dimers via strong quadruple hydrogen bonding in donor–donor–acceptor–acceptor (DDAA) arrays have been synthesized for the first time.

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Evaluation of Thermally Crosslinked Poly(Acrylic Acid-Co-Maleic Acid) (PAMA)/Poly(Vinyl Alcohol) (PVA) Microneedle Arrays

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.819.45 ◽

2019 ◽

Vol 819 ◽

pp. 45-50 ◽

Cited By ~ 2

Author(s):

Nway Nway Aung ◽

Yin Yin Myat ◽

Tanasait Ngawhirunpat ◽

Theerasak Rojanarata ◽

Prasopchai Patrojanasophon ◽

...

Keyword(s):

Acrylic Acid ◽

Maleic Acid ◽

Vinyl Alcohol ◽

Transdermal Drug Delivery ◽

Poly Vinyl Alcohol ◽

Optimal Conditions ◽

Microneedle Arrays ◽

First Time ◽

Polymer Ratio ◽

Poly Acrylic Acid

This study aimed to evaluate the optimal conditions for crosslinked of PAMA/PVA microneedle (MN) arrays. Poly (acrylic acid-co-maleic acid) (PAMA)/poly (vinyl alcohol) (PVA) MN arrays were fabricated for the first time using the micromolding technique. The PAMA/PVA MN arrays at the polymer ratio of 1:4 were sharp, homogenous and perfectly formed with an elegant appearance. The successfully crosslinking MN arrays were determined using FTIR and water insolubilization. The results showed that increasing the crosslinking temperature and time, the degree of crosslinking also improved, which results in a decline in water uptake. The optimal crosslinking condition for PAMA/PVA MN arrays was 130°C for 1 h. Moreover, the highest swelling was observed from crosslinked PAMA/PVA MN arrays at 90°C for 0.5 h. These studies suggest that the combination of PAMA and PVA for fabrication of MN arrays could have a great potential to develop both hydrogel and dissolving MN devices for transdermal drug delivery.

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Modifications in the correlation function in poly(vinyl alcohol)/silica hybrid wet gels

Journal of Applied Crystallography ◽

10.1107/s0021889808034900 ◽

2008 ◽

Vol 42 (1) ◽

pp. 10-14 ◽

Cited By ~ 3

Author(s):

Dimas R. Vollet ◽

Dario A. Donatti ◽

Alberto Ibañez Ruiz

Keyword(s):

Correlation Function ◽

Vinyl Alcohol ◽

Basic Structure ◽

Poly Vinyl Alcohol ◽

Fractal Structures ◽

Structural Modifications ◽

X Ray Scattering ◽

Mass Fractal ◽

Large Correlation ◽

First Time

Small-angle X-ray scattering was used to study structural modifications in tetraethoxysilane-derived poly(vinyl alcohol) (PVA)/silica hybrids. The basic structure of the wet gels can be described as a mass-fractal structure with fractal dimensionDequal to 2 and characteristic length ξ, which increases with addition of PVA. Wet gels with high PVA content exhibit a positive deviation from the mass-fractal power-law scattering at lowq; this deviation is associated with additional scattering due to a second large correlation distance ζ, reinforced by the addition of PVA. The fraction of both contributions to the total correlation function was estimated; this is the first time that such a study has been carried out for mass-fractal structures.

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Rheological Property of the Regenerable Polyhydroxy Alcohol Fracturing Fluid System

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.875-877.1462 ◽

2014 ◽

Vol 875-877 ◽

pp. 1462-1466

Author(s):

Xiao Rui Li ◽

Xiao Jia Xue ◽

Hua Bo Fan ◽

Xiao Juan Lai ◽

Lei Wang

Keyword(s):

Rheological Property ◽

Vinyl Alcohol ◽

Ph Value ◽

Poly Vinyl Alcohol ◽

Fracturing Fluid ◽

Fluid System ◽

Crosslinking Degree ◽

Temperature Resistance ◽

Shearing Resistance ◽

First Time

According to the characteristic of polyhydroxy alcohol fracturing fluid system, the regeneration of the system was investigated for the first time. A stable organic boron crosslinking poly (vinyl alcohol) regenerable polyhydroxy alcohol fracturing fluid system was prepared, and the rheological property of the polyhydroxy alcohol fracturing fluid system with different regenerable times was also researched. The effect of regenerable times on the rheological property of the system was studied. The results indicated that the aims of gel breaking and regeneration can be achieved by regulating its pH value and controlling its crosslinking degree. With the increment of the regenerable time, both the temperature resistance and shearing resistance performances were decreased, and the viscoelasticity of the gel was also reduced.

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Dip- and spin-assisted stereocomplexation-driven LbL self-assembly involving homochiral PVA-g-OLLA and PVA-g-ODLA copolymers

RSC Advances ◽

10.1039/c5ra22635j ◽

2015 ◽

Vol 5 (130) ◽

pp. 107370-107377 ◽

Cited By ~ 3

Author(s):

Mohamed Bahloul ◽

Sébastien Pruvost ◽

Etienne Fleury ◽

Daniel Portinha ◽

Aurélia Charlot

Keyword(s):

Thin Films ◽

Self Assembly ◽

Vinyl Alcohol ◽

Poly Vinyl Alcohol ◽

Layer By Layer ◽

First Time ◽

Opposite Chirality

Layer by Layer (LbL) thin films stemming from the formation of stereocomplex between oligolactate with opposite chirality (OLLA and ODLA) covalently anchored onto poly(vinyl alcohol) (PVA) chains is described herein for the first time.

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Deodorant activity of phthalocyanine complex nanofiber

Textile Research Journal ◽

10.1177/0040517516685280 ◽

2016 ◽

Vol 88 (6) ◽

pp. 630-635 ◽

Cited By ~ 7

Author(s):

Hoik Lee ◽

Abdul Wahab Jatoi ◽

Yamaguchi Kyohei ◽

Kyu-Oh Kim ◽

Kyung Hun Song ◽

...

Keyword(s):

Vinyl Alcohol ◽

Poly Vinyl Alcohol ◽

Methyl Mercaptan ◽

Phthalocyanine Complex ◽

Activity Test ◽

Unpleasant Odor ◽

First Time

Unpleasant odor is a problem in the modern lifestyle. In order to prevent malodor, we fabricated phthalocyanine combined with nanofibers to prevent unpleasant odor for the first time. Cu-coordinated phthalocyanine was used as an odor preventing agent and methyl mercaptan gas was selected as a model malodorant. This study was conducted with two different polymers, poly(vinyl alcohol) (PVA) and silk. A total of 4 wt% of phthalocyanine was incorporated in the solutions of both polymers, resulting in the successful fabrication of nanofibers. It is notable that the deodorant activity test clearly showed a reduction of methyl mercaptan gas in both phthalocyanine incorporated PVA and silk nanofibers. In addition, the phthalocyanine/silk nanofibers exhibited better deodorant performance in comparison to the phthalocyanine/PVA nanofiber.

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Covalently functionalized graphene with d-glucose and its reinforcement to poly(vinyl alcohol) and poly(methyl methacrylate)

RSC Advances ◽

10.1039/c5ra00038f ◽

2015 ◽

Vol 5 (21) ◽

pp. 15954-15961 ◽

Cited By ~ 24

Author(s):

Lu Gan ◽

Songmin Shang ◽

Chun Wah Marcus Yuen ◽

Shou-xiang Jiang

Keyword(s):

Methyl Methacrylate ◽

Vinyl Alcohol ◽

Poly Vinyl Alcohol ◽

Esterification Reaction ◽

Functionalized Graphene ◽

Poly Methyl Methacrylate ◽

First Time

Chemically functionalized graphene has been synthesized by covalently grafting d-glucose on graphene for the first time through an esterification reaction.

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