Modification of polyurethane by the lateral cross-linking using a modified poly(vinyl alcohol) for the improvement of tensile strength and the control of water vapor permeation

2015 ◽  
Vol 16 (9) ◽  
pp. 1819-1829 ◽  
Author(s):  
Yong-Chan Chung ◽  
Min Ju Song ◽  
Hyun-A Kwon ◽  
Byoung Chul Chun
Keyword(s):  
Tensile Strength ◽  
Water Vapor ◽  
Vinyl Alcohol ◽  
Poly Vinyl Alcohol ◽  
Cross Linking ◽  
Vapor Permeation ◽  
Water Vapor Permeation

Carvacrol as an Antimicrobial Agent for Poly(butylene succinate): Tensile Properties and Antimicrobial Activity Observations

2014 ◽  
Vol 931-932 ◽  
pp. 111-115 ◽  
Author(s):  
Sasinee Wiburanawong ◽  
Nawadon Petchwattana ◽  
Sirijutaratana Covavisaruch
Keyword(s):  
Antimicrobial Activity ◽  
Tensile Strength ◽  
Water Vapor ◽  
Tensile Properties ◽  
Tensile Modulus ◽  
Maximum Level ◽  
Butylene Succinate ◽  
Vapor Permeation ◽  
Food Packages ◽  
Water Vapor Permeation

This research aims to study the influences of carvacrol essential oil on the tensile properties and antimicrobial activity of food packages prepared from poly (butylene succinate) (PBS). Overall, the tensile strength and tensile modulus of the PBS film decreased with the addition of carvacrol beyond 4wt%. PBS elongated to a greater extent when carvacrol was employed; the elongation reached its maximum level at 19% when carvacrol was added at 10wt%. The water vapor permeation (WVP) and oxygen permeation (OP) of PBS/carvacrol films tended to increase with increasing carvacrol content due to the vaporization of some carvacrol. Carvacrol was found to effectively inhibit microorganism growth; its antimicrobial activity against S.arious growth was evident when 4wt% of carvacrol was compounded with PBS while that against E.coli growth was found only when 10wt% of carvacrol was employed.

Preparation and Characterization of Chitosan/poly( Vinyl Alcohol) Composite Packaging Films

2011 ◽  
Vol 332-334 ◽  
pp. 1739-1742 ◽  
Author(s):  
Ling Li ◽  
Zheng Wei Jin ◽  
Jian Qing Wang
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Water Vapor ◽  
Vinyl Alcohol ◽  
Permeability Coefficient ◽  
Composite Films ◽  
Weight Ratio ◽  
Poly Vinyl Alcohol ◽  
Elongation At Break ◽  
Packaging Films

A novel chitosan/poly(vinyl alcohol) composite packaging films were prepared by the casting method, and the effects of chitosan concentration on the structures, mechanical properties, permeability for oxygen and water vapor were discussed in this study. Mechanical properties of these films, which were evaluated by the tensile test and the barrier properties showed that the elongation at break (E) of the composite films decreased rapidly with the addition of chitosan, whereas, the tensile strength (TS) presented an almost opposite trend. Both the water vapour and oxygen transmission rate values were increased with the increasing amount of the chitosan in the composite films. Based on the obtained results, the better property of the composites films would be prepared chitosan/poly(vinyl alcohol) blends at a weight ratio of 3/5, and the tensile strength and elongation at break of the packaging films were 34.12 MPa, 40.24 % respectively. It was also observed that the water vapor permeability coefficient (Pv) and the oxygen permeability coefficient (P) of chitosan/poly(vinyl alcohol) composite packaging films prepared with weight ratio of 3/5 were 1.99×10-15 g•cm/cm2•s•Pa and 7.98×10-16 cm3•cm/cm2•s•Pa respectively. The composite films in this paper can be used in fresh-keeping or other fields as a kind of green packaging material.

scholarly journals Tensile Strength and Solubility Studies of Edible Biodegradable Films Developed from Pseudo-cereal Starches: An Inclusive Comparison with Commercial Corn Starch

2020 ◽  
Author(s):  
Narender Kumar Chandla ◽  
Sunil Kumar Khatkar ◽  
Sukhcharn Singh ◽  
D. C. Saxena ◽  
Navdeep Jindal ◽  
...  
Keyword(s):  
Tensile Strength ◽  
Water Vapor ◽  
Surface Crack ◽  
Carboxymethyl Cellulose ◽  
Corn Starch ◽  
Biodegradable Films ◽  
Casting Method ◽  
Vapor Permeation ◽  
Solubility Studies ◽  
Water Vapor Permeation

Edible biodegradable films were prepared from amaranth, buckwheat and commercial important corn starches by casting method. Starch, glycerol and carboxymethyl cellulose (CMC) were used to prepare filmogenic starch solutions in potable luke warm water, followed by ultra-sonication for homogenous mixing of the mixed ingredients. After this, heating was applied to starch based slurried solutions until it turned into gel solutions. These filmogenic gel solutions were then dried and films were peeled off and stored in desiccator. Stored films were analyzed for functional properties viz., tensile strength, solubility and water vapor permeation. Amaranth starch based edible biodegradable films presented considerable clarity values however buckwheat starch and corn starch based films exhibited good tensile strength and better solubility values. Developed edible biodegradable films from amaranth starch were analysed for surface structure examination by SEM. Evaluation of surface revealed uniformity, homogeneity with no surface crack on the surface of developed edible biodegradable films.

scholarly journals Bioprinting Via a Dual-Gel Bioink Based on Poly(Vinyl Alcohol) and Solubilized Extracellular Matrix towards Cartilage Engineering

2021 ◽  
Vol 22 (8) ◽  
pp. 3901
Author(s):  
Mohsen Setayeshmehr ◽  
Shahzad Hafeez ◽  
Clemens van Blitterswijk ◽  
Lorenzo Moroni ◽  
Carlos Mota ◽  
...  
Keyword(s):  
Extracellular Matrix ◽  
Cell Viability ◽  
Vinyl Alcohol ◽  
Compression Modulus ◽  
Synthetic Polymers ◽  
Poly Vinyl Alcohol ◽  
Cross Linking ◽  
Light Curing ◽  
Shape Retention ◽  
Amine Groups

Various hydrogel systems have been developed as biomaterial inks for bioprinting, including natural and synthetic polymers. However, the available biomaterial inks, which allow printability, cell viability, and user-defined customization, remains limited. Incorporation of biological extracellular matrix materials into tunable synthetic polymers can merge the benefits of both systems towards versatile materials for biofabrication. The aim of this study was to develop novel, cell compatible dual-component biomaterial inks and bioinks based on poly(vinyl alcohol) (PVA) and solubilized decellularized cartilage matrix (SDCM) hydrogels that can be utilized for cartilage bioprinting. In a first approach, PVA was modified with amine groups (PVA-A), and mixed with SDCM. The printability of the PVA-A/SDCM formulations cross-linked by genipin was evaluated. On the second approach, the PVA was functionalized with cis-5-norbornene-endo-2,3-dicarboxylic anhydride (PVA-Nb) to allow an ultrafast light-curing thiol-ene cross-linking. Comprehensive experiments were conducted to evaluate the influence of the SDCM ratio in mechanical properties, water uptake, swelling, cell viability, and printability of the PVA-based formulations. The studies performed with the PVA-A/SDCM formulations cross-linked by genipin showed printability, but poor shape retention due to slow cross-linking kinetics. On the other hand, the PVA-Nb/SDCM showed good printability. The results showed that incorporation of SDCM into PVA-Nb reduces the compression modulus, enhance cell viability, and bioprintability and modulate the swelling ratio of the resulted hydrogels. Results indicated that PVA-Nb hydrogels containing SDCM could be considered as versatile bioinks for cartilage bioprinting.

Poly(vinyl alcohol) hollow microcapsules prepared by emulsification, salting out, and photo cross-linking method

2012 ◽  
Vol 29 (8) ◽  
pp. 1108-1113 ◽  
Author(s):  
Mi Sun Lee ◽  
Eun Young Mok ◽  
Won Cheol Shin ◽  
Jong Dai Kim ◽  
Jin-Chul Kim
Keyword(s):  
Vinyl Alcohol ◽  
Poly Vinyl Alcohol ◽  
Cross Linking ◽  
Salting Out
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