Water-induced shape memory behavior of poly (vinyl alcohol) and p-coumaric acid-modified water-soluble chitosan blended membrane

2021 ◽  
Vol 257 ◽  
pp. 117633
Author(s):  
Pradeep Kumar Panda ◽  
Jen-Ming Yang ◽  
Yen-Hsiang Chang
Keyword(s):  
Shape Memory ◽  
Vinyl Alcohol ◽  
Water Soluble ◽  
Poly Vinyl Alcohol ◽  
Coumaric Acid ◽  
Shape Memory Behavior ◽  
Blended Membrane

scholarly journals Self-Healing Polymer-Clay Hybrids by Facile Complexation of a Waterborne Polymer with a Clay

2021 ◽  
Author(s):  
Aranee Pleng Teepakakorn ◽  
Makoto Ogawa
Keyword(s):  
Vinyl Alcohol ◽  
Aqueous Media ◽  
Water Soluble ◽  
Poly Vinyl Alcohol ◽  
Self Healing ◽  
Soluble Polymer ◽  
Water Soluble Polymer ◽  
Smectite Clay

Water-induced self-healing materials were prepared by the hybridization of a water-soluble polymer, poly(vinyl alcohol), with a smectite clay by mixing in an aqueous media and subsequent casting. Without using chemical...

Effect of Cobalt Stearate and Vegetable Oil on Uv and Biodegradation of Linear Low-Density Poly(Ethylene)-Poly(Vinyl Alcohol) Blends

2011 ◽  
Vol 2 (4) ◽  
pp. 131-148 ◽  
Author(s):  
Francis Vidya ◽  
Subin S. Raghul ◽  
Sarita G Bhat ◽  
Eby Thomas Thachil
Keyword(s):  
Vegetable Oil ◽  
Vinyl Alcohol ◽  
Water Soluble ◽  
Poly Vinyl Alcohol ◽  
Low Density ◽  
Compression Moulding ◽  
Melt Mixing ◽  
Degradation Behaviour ◽  
Moulding Process ◽  
Poly Ethylene

The main objective of this study was to enhance the rate of UV and biodegradation of polyethylene by incorporating biodegradable materials and prooxidants. Prooxidants such as transition metal complexes are capable of initiating photooxidation and polymer chain cleavage, rendering the product more susceptible to biodegradation. In this work, the effect of (1) a metallic photoinitiator, cobalt stearate, and (2) different combinations of cobalt stearate and vegetable oil on the photooxidative degradation of linear low-density poly(ethylene)-poly(vinyl alcohol) (LLDPE/PVA) blend films has been investigated. For this, film-grade LLDPE was blended with different proportions of PVA. PVA is widely used in the industrial field, and recently it has attracted increasing attention as a water-soluble biodegradable polymer. Cobalt stearate and vegetable oil were added to the blends as prooxidants. The blends were prepared by melt mixing in a Thermo HAAKE Polylab system. Thin films containing these additives were prepared by a subsequent compression moulding process. The effect of UV exposure on LLDPE/PVA films in the presence as well as absence of these additives was investigated. Tensile properties, FTIR spectra, and scanning electron microscopy (SEM) were employed to investigate the degradation behaviour. It was found

Water Induced Shape Memory and Healing Effects by Introducing Carboxymethyl Cellulose Sodium into Poly(vinyl alcohol)

2018 ◽  
Vol 57 (44) ◽  
pp. 15046-15053 ◽  
Author(s):  
Jiyu Yang ◽  
Yanan Zheng ◽  
Linjuan Sheng ◽  
Hongmei Chen ◽  
Lijuan Zhao ◽  
...  
Keyword(s):  
Shape Memory ◽  
Vinyl Alcohol ◽  
Carboxymethyl Cellulose ◽  
Poly Vinyl Alcohol ◽  
Carboxymethyl Cellulose Sodium

scholarly journals Improving Ethanol Permeation Efficiency Using Modified Poly(Vinyl Alcohol) Membrane

2018 ◽  
Vol 2 (3) ◽  
pp. 133
Author(s):  
Ulfa Andayani ◽  
Jumina Jumina ◽  
Dwi Siswanta ◽  
Diah Mardiana
Keyword(s):  
Vinyl Alcohol ◽  
Permeation Rate ◽  
Membrane Stability ◽  
Optimum Composition ◽  
Poly Vinyl Alcohol ◽  
High Flux ◽  
Membrane Permeation ◽  
Cross Linker ◽  
Blended Membrane

<p>This research is about using blended membrane poly(vinyl alcohol)-pectin that are crosslinked by glutareldehide for ethanol permeation. Poly(vinyl alcohol) or PVA is used as the base membrane, pectin as biopolymers and gluteraldehida (GA) as a crosslinker agent. The objective of this study is improving the efficiency of ethanol permeation using blended PVA membrane with pectin and glutaraldehyde to determine the optimum composition of blended membrane PVA-pectin-GA. Membrane with optimum composition is selected based on the highest flux value. Membrane optimization was obtained by studying the effect of the PVA concentration, the addition of GA and pectin. Moreover, optimization was studied based on membrane permeation rate (flux) of ethanol that passes through the membrane. Membranes with high flux value were selected as the optimum membrane. The results conclude: (1) Addition of gluteraldehide decreased flux values but increased membrane stability. The highest flux value generated from the blended membrane that has cross-linker number (n) 120; (2) Addition of pectin increased flux value but decreased membrane stability. The highest flux value was obtained from blended membrane of PVA-pectin-GA with the optimum composition on mole ratio of PVA: pectin = (1: 2).</p>

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