scholarly journals Influence of Ammonium Zirconium Carbonate on Properties of Poly(vinyl alcohol)/Xylan Composite Films

2015 ◽  
Vol 2015 ◽  
pp. 1-8 ◽  
Author(s):  
Xiao-feng Chen ◽  
Jun-li Ren ◽  
Ling Meng
Keyword(s):  
Mechanical Properties ◽  
Thermal Stability ◽  
Vinyl Alcohol ◽  
Positive Impact ◽  
Raw Materials ◽  
Composite Films ◽  
Water Vapor Permeability ◽  
Poly Vinyl Alcohol ◽  
Vapor Permeability ◽  
Ammonium Zirconium Carbonate

A series of composite films were prepared using poly(vinyl alcohol) (PVA) and xylan as degradable raw materials under the addition of glycerol and ammonium zirconium carbonate (AZC). The influences of AZC on the mechanical properties, water-resisting properties, thermal stability, solubility (S), and water vapor permeability of PVA/xylan composite films were comparatively discussed. The results showed that AZC had a positive impact on improving the water resistance and mechanical properties of composite films especially for elongation at break (EAB). With increasing the AZC amounts from 0% to 15%, EAB increased rapidly from 18.5% to 218.0%, and theSvalues decrease from 11.64% to 8.64%. When the AZC amount reached 15%, the tensile strength still performed well (22.10 MPa). The great compatibility of components in composite films was also observed. Moreover, the addition of AZC had great influences on the thermal stability of composite films and the degradation in soil.

Fabrication of Composite Films Based on Chitosan and Vegetable-Tanned Collagen Fibers Crosslinked with Genipin

2021 ◽  
Vol 116 (10) ◽  
Author(s):  
Jie Liu ◽  
Yanchun Liu ◽  
Eleanor M. Brown ◽  
Zhengxin Ma ◽  
Cheng-Kung Liu
Keyword(s):  
Mechanical Properties ◽  
Thermal Stability ◽  
Water Vapor ◽  
Composite Film ◽  
Composite Films ◽  
Value Added ◽  
Water Vapor Permeability ◽  
Vapor Permeability ◽  
Leather Industry ◽  
Compact Structure

The leather industry generates considerable amounts of solid waste and raises many environmental concerns during its disposal. The presence of collagen in these wastes provides a potential protein source for the fabrication of bio-based value-added products. Herein, a novel composite film was fabricated by incorporating vegetable-tanned collagen fiber (VCF), a mechanically ground powder-like leather waste, into a chitosan matrix and crosslinked with genipin. The obtained composite film showed a compact structure and the hydrogen bonding interactions were confirmed by FTIR analysis, indicating a good compatibility between chitosan and VCF. The optical properties, water absorption capacity, thermal stability, water vapor permeability and mechanical properties of the composite films were characterized. The incorporation of VCF into chitosan led to significant decreases in opacity and solubility of the films. At the same time, the mechanical properties, water vapor permeability and thermal stability of the films were improved. The composite film exhibited antibacterial activity against food-borne pathogens. Results from this research indicated the potential of the genipin-crosslinked chitosan/VCF composites for applications in antimicrobial packaging. 

Effects of low poly(vinyl alcohol) content on properties of biodegradable blowing films based on two modified starches

2015 ◽  
Vol 30 (7) ◽  
pp. 1017-1030 ◽  
Author(s):  
Wentao Wang ◽  
Hui Zhang ◽  
Yangyong Dai ◽  
Hanxue Hou ◽  
Haizhou Dong
Keyword(s):  
Water Vapor ◽  
Vinyl Alcohol ◽  
Composite Films ◽  
Water Vapor Permeability ◽  
Poly Vinyl Alcohol ◽  
Vapor Permeability ◽  
Electron Microscopic ◽  
X Ray ◽  
Modified Starches ◽  
Ray Patterns

Biodegradable films from hydroxypropyl distarch phosphate (HPDSP)/poly(vinyl alcohol) (PVA) and cationic starch/PVA blends were obtained by extrusion blowing at ratios of 100:0, 95:5, 90:10, 85:15, and 80:20. The morphology, X-ray patterns, transparency, mechanical properties, thermal properties, and water vapor permeability (WVP) of the films were measured and compared. Scanning electron microscopic micrographs of the films showed continuous matrix texture as well as better compatibility between modified starches and PVA. X-Ray diffraction indicated the formation of ordered crystalline structures in the films during extrusion blowing. The addition of PVA to modified starches significantly increased their tensile strength (TS, 3.92 MPa) while decreasing their water vapor permeability (WVP, 3.23 × 10−10 g m−1 s−1 Pa−1). The starch/PVA composite films did not show phase separation.

scholarly journals Few-layer graphene aqueous suspensions for polyurethane composite coatings

MRS Advances ◽  
2016 ◽  
Vol 2 (1) ◽  
pp. 57-62 ◽  
Author(s):  
Eunice Cunha ◽  
Fernando Duarte ◽  
M. Fernanda Proença ◽  
M. Conceição Paiva
Keyword(s):  
Mechanical Properties ◽  
Tensile Testing ◽  
Composite Coatings ◽  
Composite Films ◽  
Water Vapor Permeability ◽  
Waterborne Polyurethane ◽  
Vapor Permeability ◽  
Layer Graphene ◽  
Polyurethane Composite ◽  
Few Layer Graphene

ABSTRACTGraphite nanoplates (GnP) have recently attracted attention as an economically viable alternative for the development of functional and structural nanocomposites. The incorporation of GnP into waterborne polyurethane (WPU) with loadings from 0.1 to 10 wt.% was studied. The mechanical properties of the composite films were assessed by tensile testing showing an increase of the Young’s modulus up to 48%. The electrical conductivity increased by 9 orders of magnitude and the water vapor permeability of the composite films decreased 57% for composites containing 5.0 wt.% of GnP.

scholarly journals Mussel-Inspired Approach to Constructing Dual Network Coated Layered Clay for Enhanced Barrier and Antibacterial Properties of Poly(vinyl alcohol) Nanocomposites

Polymers ◽  
2020 ◽  
Vol 12 (9) ◽  
pp. 2093
Author(s):  
Long Mao ◽  
Jianda Xie ◽  
Huiqing Wu ◽  
Yuejun Liu
Keyword(s):  
Vinyl Alcohol ◽  
Antibacterial Properties ◽  
Water Vapor Permeability ◽  
Poly Vinyl Alcohol ◽  
Vapor Permeability ◽  
One Pot ◽  
Solution Casting Method ◽  
Uv Transmittance ◽  
Layered Clay ◽  
Double Hydroxides

Inspired by complexation and mussel adhesion of catechol groups in tannic acid (TA), organophilic layered double hydroxides (LDHs@TA-Ti) were synthesized by forming a one-pot assembled TA-titanium (Ti) dual network coating on the surface of layered clay for the first time. LDHs@TA-Ti/poly(vinyl alcohol) (PVA) nanocomposites were prepared by the solution casting method. The results show that TA-Ti(IV) and TiO2 coordination compounds are simultaneously formed due to hydrolysis of titanium tetrachloride and complexation of TA in aqueous solution. Upon TA-Ti coatings onto the surface of LDHs, the antibacterial rate of LDHs@TA-Ti is up to 99.98%. Corresponding LDHs@TA-Ti/PVA nanocomposites also show outstanding antibacterial properties. Compared with pure PVA, LDHs@TA-Ti/PVA nanocomposites show a 40.9% increase in tensile strength, a 17.5% increase in elongation at break, a 35.9% decrease in oxygen permeability and a 26.0% decrease in water vapor permeability when adding 1 wt % LDHs@TA-Ti. UV transmittance (at 300 nm) of LDHs@TA-Ti/PVA nanocomposites decrease by 99.4% when the content of LDHs@TA-Ti reaches 3 wt %. These results indicate that PVA matrix incorporated with LDHs@TA-Ti could be used as a potential active packaging material to extend the shelf life of food products.

The properties of sericin/poly(vinyl alcohol) films modified by boric acid

e-Polymers ◽  
2010 ◽  
Vol 10 (1) ◽  
Author(s):  
Qun Wang ◽  
Lu Qi
Keyword(s):  
Mechanical Properties ◽  
Thermal Stability ◽  
Boric Acid ◽  
Vinyl Alcohol ◽  
Water Resistance ◽  
Poly Vinyl Alcohol ◽  
Scanning Calorimetry ◽  
Blend Ratio ◽  
Percutaneous Drug Delivery ◽  
Thermal Stability Of

AbstractA group of films mainly composed of sericin and poly(vinyl alcohol) (PVA), using boric acid (BA) as a modifier, were prepared by a technique of solution casting. In this work, the effect of BA and sericin on the mechanical properties and water resistance of the films was analyzed, the interior morphology of the films were described by a scanning electron microscopy (SEM), the thermal stability of the films was characterized by differential scanning calorimetry (DSC), and the reaction mechanism was proposed according to the previous literature and the test of Fourier transform infrared spectrum (FTIR). Results indicated that, the properties of the membrane were the functions of the blend ratio of sercin to PVA and the content of BA. The use of BA increased the tensile strength, improved the water resistance and the thermal stability, and varied the interior morphology of the films. The content of sericin greatly influenced the combination of properties of the films, especially the mechanical properties, interior morphology, thermal stability, and water resistance reducing with the increasing of sericin content. The films have potential to be used in materials, such as skin-care coatings for beauty, percutaneous drug delivery systems for exterior intact skin, due to the characteristics of the components and the good mechanical properties of the films.

Preparation and Properties of Biocomposite Film with Gelatin and Poly(Vinyl Alcohol)

2011 ◽  
Vol 287-290 ◽  
pp. 302-305
Author(s):  
Xi Ping Gao ◽  
Ke Yong Tang ◽  
Yu Qing Zhang
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Optical Properties ◽  
Vinyl Alcohol ◽  
Composite Films ◽  
Poly Vinyl Alcohol ◽  
Elongation At Break ◽  
Biocomposite Film

The mechanical properties, swelling, solubility, and optical properties of composite films with poly(vinyl alcohol) (PVA) and gelatin were studied. With increasing the PVA content in the composite films, the tensile strength (TS) and elongation at break (EB) of the films increase. The swelling and solubility are different with different gelatin/PVA ratios, with the lowest at 1:5.

scholarly journals Design of Novel PLA/OMMT Films with Improved Gas Barrier and Mechanical Properties by Intercalating OMMT Interlayer with High Gas Barrier Polymers

Polymers ◽  
2021 ◽  
Vol 13 (22) ◽  
pp. 3962
Author(s):  
Abdul Shakoor Shar ◽  
Caili Zhang ◽  
Xieqing Song ◽  
Yunxuan Weng ◽  
Qiuyue Du
Keyword(s):  
Mechanical Properties ◽  
Vinyl Alcohol ◽  
Composite Films ◽  
Barrier Properties ◽  
Poly Vinyl Alcohol ◽  
Diffraction Measurement ◽  
Scanning Calorimetry ◽  
Gas Barrier ◽  
Ethylene Vinyl Alcohol ◽  
Barrier Polymers

Polymer/clay composites are an innovative class of materials. In this study, we present a facile method for the preparation of biodegradable and robust PLA/organomodified montmorillonite (OMMT) composite films with excellent gas barrier performance. When the design of PLA/OMMT composite films, in addition to making OMMT have good intercalation effect in the matrix, the compatibility of intercalating polymer and matrix should also be considered. In this work, two polymers with high gas barrier properties, namely poly(vinyl alcohol) (PVA) and ethylene vinyl alcohol copolymer (EVOH), were selected to intercalate OMMT. The morphology and microstructures of the prepared PLA/PVA/OMMT and PLA/EVOH/OMMT composites were characterized by the X-ray diffraction measurement, scanning electron microscopy, and differential scanning calorimetry. It was shown that the good dispersibility of PVA in the PLA matrix, rather than the intercalation effect, was responsible for the improved gas barrier and mechanical properties of PLA/PVA/OMMT composite. The elongation at break increases from 4.5% to 22.7% when 1 wt % PVA is added to PLA/OMMT. Moreover, gas barrier of PLA/PVA1/OMMT measured as O2 permeability is 52.8% higher than that of neat PLA. This work provides a route to intercalate OMMT interlayer with high gas barrier polymers and thus can be a useful reference to fabricate PLA/OMMT composites with improved gas barrier and mechanical properties. A comparison of oxygen permeabilities with existing commercial packaging films indicates that the biodegradable PLA/PVA/OMMT may serve as a viable substitute for packaging film applications.

scholarly journals Physical Properties of Starch/Powdered Activated Carbon Composite Films

Polymers ◽  
2021 ◽  
Vol 13 (24) ◽  
pp. 4406
Author(s):  
Anita Kwaśniewska ◽  
Michał Świetlicki ◽  
Adam Prószyński ◽  
Grzegorz Gładyszewski
Keyword(s):  
Mechanical Properties ◽  
Activated Carbon ◽  
Water Vapor ◽  
Water Solubility ◽  
Composite Films ◽  
Water Vapor Permeability ◽  
Barrier Properties ◽  
Carbon Composite ◽  
Powdered Activated Carbon ◽  
Vapor Permeability

In the present study, starch/powdered activated carbon composite films were prepared by incorporating various amounts of powdered activated carbon (PAC)—1–5, 10, and 15 %—into a starch matrix, using the solvent casting method. The effect of PAC addition on the biopolymer film was investigated. The mechanical properties were examined by ultra-nanoindentation, nanoscratch, and micro-tensile tests. Since the mechanical properties of biopolymer films are correlated with their structure, the effect of PAC addition was tested using X-ray diffraction. The surface parameters morphology and wettability were analyzed by atomic force microscopy (AFM) and contact angle measurements. The barrier properties were examined by determining water vapor permeability and the water solubility index. The obtained results did not show a monotonic dependence of the mechanical parameters on PAC content, with the exception of the maximum strain, which decreased as the amount of the additive increased. The visible effect of PAC addition was manifested in changes in the adhesive force value and in water vapor permeability (WVP). The barrier properties decreased with the increase of the filler content.

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