scholarly journals Plasticized Starch/Agar Composite Films: Processing, Morphology, Structure, Mechanical Properties and Surface Hydrophilicity

Coatings ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 311
Author(s):  
Yabin Guo ◽  
Binjia Zhang ◽  
Siming Zhao ◽  
Dongling Qiao ◽  
Fengwei Xie
Keyword(s):  
Mechanical Properties ◽  
Biomedical Applications ◽  
Composite Films ◽  
Elongation At Break ◽  
Surface Hydrophilicity ◽  
Lamellar Structures ◽  
Agar Film ◽  
Tissue Scaffolding ◽  
Chain Interaction ◽  
Starch Agar

Natural biopolymers, which are renewable, widely available, biodegradable, and biocompatible, have attracted huge interest in the development of biocomposite materials. Herein, formulation–property relationships for starch/agar composite films were investigated. First, rapid visco analysis was used to confirm the conditions needed for their gelation and to prepare filmogenic solutions. All the original crystalline and/or lamellar structures of starch and agar were destroyed, and films with cohesive and compact structures were formed, as shown by SEM, XRD, and SAXS. All the plasticized films were predominantly amorphous, and the polymorphs of the composite films were closer to that of the agar-only film. FTIR results suggest that the incorporation of agar restricted starch chain interaction and rearrangement. The addition of agar to starch increased both tensile strength and elongation at break, but the improvements were insignificant after the agar content was over 50 wt.%. Contact angle results indicate that compared with the other samples, the 4:6 (wt./wt.) starch/agar film was less hydrophilic. Thus, this work shows that agar dominates the structure and properties of starch/agar composites, and the best properties can be obtained with a certain starch/agar ratio. Such composite polysaccharide films with tailored mechanical properties and surface hydrophilicity could be useful in biodegradable packaging and biomedical applications (wound dressing and tissue scaffolding).

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 Synthesis and Optical Properties of Chitosan/polypyrrole Composite for Biological Applications

2021 ◽  
Vol 10 (4) ◽  
pp. 2742-2749
Keyword(s):  
Mechanical Properties ◽  
Optical Properties ◽  
Electrostatic Interaction ◽  
Electrical Conduction ◽  
Biomedical Applications ◽  
Optical Band Gap ◽  
Composite Films ◽  
Biological Applications ◽  
Chitosan Matrix ◽  
Polypyrrole Composite

Polypyrrole conducting polymers have become significant in different biomedical applications, but unfortunately, they are insoluble with poor mechanical properties. A natural soluble polymer (Chitosan) can be used to improve such properties. Chitosan/polypyrrole composites were synthesized by dispersing the different doped amounts of polypyrrole into the chitosan matrix. The physical properties of the synthesized composite films were investigated using different techniques. The results obtained from FTIR, XRD show the electrostatic interaction between chitosan and polypyrrole. UV/Vis analysis implies that the optical band gap of composite films decreases with increasing polypyrrole concentration, which can be assumed to increase the electrical conduction in the composite films.

scholarly journals Mechanical Properties of Thermoplastic Starch Biocomposite Films with Hybrid Fillers

2021 ◽  
Vol 2080 (1) ◽  
pp. 012011
Author(s):  
Di Sheng Lai ◽  
Sinar Arzuria Adnan ◽  
Azlin Fazlina Osman ◽  
Ismail Ibrahim ◽  
Hazrul Haq
Keyword(s):  
Mechanical Properties ◽  
Food Packaging ◽  
Corn Starch ◽  
Composite Films ◽  
Thermoplastic Starch ◽  
Elongation At Break ◽  
Biocomposite Films ◽  
Hybrid Fillers ◽  
The Matrix ◽  
Dry Food

Abstract Thermoplastic starch (TPS) was studied extensively to replace conventional plastic in packaging application. In this study, granule corn starch was first plasticized with water and glycerol to form TPS films and two different fillers were incorporated with TPS to form hybrid biocomposite films (TPSB). Two different fillers: Microcrystalline cellulose (MC) and Nano bentonite (NB) fixed at 1: 4 ratios in various loading (1wt%-6wt%) were incorporated in TPS to study effect of hybrid fillers on the mechanical properties of TPSB films. The effect of different loading of MC/NB on TPSB films was investigated through the structural, morphological and mechanical testing. Fourier Transform Infrared Spectroscopy (FTIR) shows TPS matrix and hybrid fillers are highly compatible due to hydroxyl bonding and verified through the shifting of spectra band. Scanning Electron Microscope (SEM) showed even distribution of fillers in the matrix of TPS. The TPSB films exhibited significant improvement 40% in elongation at break compared to pure TPS films. In this study, 5wt% is best loading of the hybrid fillers to incorporated in TPSB films as it achieved the highest value of tensile strength (8.52MPa), Young’s Modulus (42.0 MPa) and elongation at break (116.3%). Generally, previous studies showed flexibility of TPS composite films reduced with incorporating filler, however in this study, the flexibility TPSB show significant improvement compared to previous studies and exhibit promising potential in dry food packaging application.

A Study of FTIR and some Mechanical Properties of Sodium Iodide (NaI) Salt Filled Polymer Polyvinyl Alcohol (PVA) Films

2018 ◽  
Vol 78 ◽  
pp. 30-38 ◽  
Author(s):  
Sabah A. Salman ◽  
Nabeel A. Bakr ◽  
Huda T. Homad
Keyword(s):  
Mechanical Properties ◽  
Polyvinyl Alcohol ◽  
Sodium Iodide ◽  
Composite Films ◽  
Weight Ratio ◽  
Hardness Test ◽  
Tensile Tests ◽  
Vibrational Modes ◽  
Spectra Analysis ◽  
Elongation At Break

The effect of Sodium Iodide (NaI) salt on mechanical properties of polyvinyl alcohol (PVA) was studied in this work. The interaction between (NaI) salt and polymer (PVA) was investigated by (FTIR) spectroscopy. The effect of (NaI) salt on the mechanical properties of the polymer (PVA) was studied by hardness and tensile tests. FTIR spectra analysis of pure and (NaI) filled (PVA) films showed that the vibrational modes have changed due to the effect of filler salt in the polymer (PVA). Hardness test showed that the hardness increases unsystematically with increasing the weight ratio of added sodium iodide salt except the weight ratio of (16 wt %) compared with pure (PVA) film, while the experimental results of the tensile test for (PVA-NaI) composite films showed unsystematic change of tensile strength, elongation at break and Young's modulus after filling with different weight ratios of (NaI) salt compared with pure (PVA) film.

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.

Physical and Mechanical Properties of Chitosan Films Incorporated with Florida Mandarin Oil

2014 ◽  
Vol 881-883 ◽  
pp. 1153-1156 ◽  
Author(s):  
Yun Bin Zhang ◽  
Jing Wen Wang ◽  
Ping Ping Jiang ◽  
Yue Xia Li ◽  
Xiao Yu Liu
Keyword(s):  
Mechanical Properties ◽  
Contact Angle ◽  
Water Contact Angle ◽  
Water Solubility ◽  
Composite Films ◽  
Physical And Mechanical Properties ◽  
Water Contact ◽  
Elongation At Break ◽  
Alkali Leaching ◽  
Chitosan Composite

Florida mandarin oil-chitosan composite films were prepared with chitosan (CS), Florida mandarin oil (FMO) by casting-evaporation-alkali leaching method. Influences of FMO to mechanical properties, water contact angle, water-solubility of films were evaluated. The results demonstrated that decrease of film tensile strength was caused by addition of FMO. When FMO content was 4%, elongation at break reached the maximum (2.81±0.01%). Water contact angle and solubility of film increased with increase of FMO content, maximums were 81.80±0.09° and 1.51±0.02 mg/100 g H2O, respectively.

scholarly journals Influence of Hard Segment Content and Diisocyanate Structure on the Transparency and Mechanical Properties of Poly(dimethylsiloxane)-Based Urea Elastomers for Biomedical Applications

Polymers ◽  
2021 ◽  
Vol 13 (2) ◽  
pp. 212
Author(s):  
Natascha Riehle ◽  
Kiriaki Athanasopulu ◽  
Larysa Kutuzova ◽  
Tobias Götz ◽  
Andreas Kandelbauer ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Biomedical Applications ◽  
Hard Segment ◽  
Phenyl Isocyanate ◽  
In Vitro Cytotoxicity ◽  
Chain Extender ◽  
Elongation At Break ◽  
Hard Segment Content ◽  
Hard Segments

The effect of hard segment content and diisocyanate structure on the transparency and mechanical properties of soft poly(dimethylsiloxane) (PDMS)-based urea elastomers (PSUs) was investigated. A series of PSU elastomers were synthesized from an aminopropyl-terminated PDMS (M¯n: 16,300 g·mol−1), which was prepared by ring chain equilibration of the monomers octamethylcyclotetrasiloxane (D4) and 1,3-bis(3-aminopropyl)-tetramethyldisiloxane (APTMDS). The hard segments (HSs) comprised diisocyanates of different symmetry, i.e., 4,4′-methylenebis(cyclohexyl isocyanate) (H12MDI), 4,4′-methylenebis(phenyl isocyanate) (MDI), isophorone diisocyanate (IPDI), and trans-1,4-cyclohexane diisocyanate (CHDI). The HS contents of the PSU elastomers based on H12MDI and IPDI were systematically varied between 5% and 20% by increasing the ratio of the diisocyanate and the chain extender APTMDS. PSU copolymers of very low urea HS contents (1.0–1.6%) were prepared without the chain extender. All PSU elastomers and copolymers exhibited good elastomeric properties and displayed elongation at break values between 600% and 1100%. The PSUs with HS contents below 10% were transparent and became increasingly translucent at HS contents of 15% and higher. The Young’s modulus (YM) and ultimate tensile strength values of the elastomers increased linearly with increasing HS content. The YM values differed significantly among the PSU copolymers depending on the symmetry of the diisocyanate. The softest elastomer was that based on the asymmetric IPDI. The elastomers synthesized from H12MDI and MDI both exhibited an intermediate YM, while the stiffest elastomer, i.e., that comprising the symmetric CHDI, had a YM three-times higher than that prepared with IPDI. The PSUs were subjected to load–unload cycles at 100% and 300% strain to study the influence of HS morphology on 10-cycle hysteresis behavior. At 100% strain, the first-cycle hysteresis values of the IPDI- and H12MDI-based elastomers first decreased to a minimum of approximately 9–10% at an HS content of 10% and increased again to 22–28% at an HS content of 20%. A similar, though less pronounced, trend was observed at 300% strain. First-cycle hysteresis among the PSU copolymers at 100% strain was lowest in the case of CHDI and highest in the IPDI-based elastomer. However, this effect was reversed at 300% strain, with CHDI displaying the highest hysteresis in the first cycle. In vitro cytotoxicity tests performed using HaCaT cells did not show any adverse effects, revealing their potential suitability for biomedical applications.

scholarly journals Development of Electrically Conductive Nanocrystalline Thin Film for Optoelectronic Applications

2013 ◽  
Vol 15 ◽  
pp. 90-101 ◽  
Author(s):  
Sujan Kumar Das ◽  
Jahid M.M. Islam ◽  
Monirul Hasan ◽  
Humayun Kabir ◽  
Md Abdul Gafur ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Electrical Properties ◽  
Composite Films ◽  
Young Modulus ◽  
Electrically Conductive ◽  
Elongation At Break ◽  
Ohmic Behavior ◽  
Nanocrystalline Thin Film ◽  
Electrically Conductive Composite

Sodium alginate (TiO2) sand composites were prepared by solution casting. Purified sand was added in the composite films to increase electrical conductivity. Electrical properties such as conductivity, capacitance, dielectric constant, and loss tangent of the composites were investigated. The current voltage characteristics for all the composites showed ohmic behavior. All the electrical properties have been found to improve with the incorporation of sand (SiO2) but 6% sand containing composite exhibits the best electrical properties. The mechanical properties tensile strength (TS), elongation at break (Eb) and Young modulus for 6% sand containing composite film are found to be 4.445 MPa, 9.76%, and 72.8 MPa respectively. The experimental results reveal that the blended films exhibit higher stability and improved mechanical properties of both tensile strength and elongation at break in dry state. Water absorption properties of the composites are found to decrease with the increase of sand content. Lowest water uptake properties and highest stability were demonstrated by 6% sand containing sample. Electrically conductive composite films have useful applications for solar cells and optoelectronics. Thus, this study is very much expected to aid in the design and selection of proper composite for the potential application of solar cell and optoelectronics.

Study on the Properties of the Gelatin Modified Chitosan Films

2012 ◽  
Vol 482-484 ◽  
pp. 863-867 ◽  
Author(s):  
Wei Dong ◽  
Li Jun Qu ◽  
Xiao Qing Guo
Keyword(s):  
Mechanical Properties ◽  
Water Solubility ◽  
Composite Films ◽  
Chitosan Film ◽  
X Ray Diffraction ◽  
Elongation At Break ◽  
X Ray ◽  
Modified Chitosan ◽  
Ft Ir ◽  
Chitosan Films

Abstract: With the purpose to improve the mechanical properties and cut costs of chitosan films, a series of gelatin-chitosan films were prepared. The effect of gelatin content on the mechanical properites of films was studied. FT-IR spectrum and X-ray diffraction analysis showed good compatibility between gelatin and chitosan. The composite films exhibited a higher TS(tensile strengths) and ES(elongation at break) compared with chitosan film, especially when the content of gelatin in blends was 30%. The TS and ES revealed that the interaction between chitosan and gelatin was the strongest when the content of gelatin in blends was 30%. The results obtained from percent water absorption indicated these two biopolymers were high hydrophilicity polymer. The water solubility of composite films was higher than chitosan films. The results suggest that the interactions between gelatin and chitosan was good for the mechanical properties of composite films.

scholarly journals The Effects of Coupling Agents on the Properties of Polyimide/Nano-Al2O3Three-Layer Hybrid Films

2010 ◽  
Vol 2010 ◽  
pp. 1-5 ◽  
Author(s):  
Lizhu Liu ◽  
Ling Weng ◽  
Yuxia Song ◽  
Lin Gao ◽  
Qingquan Lei
Keyword(s):  
Mechanical Properties ◽  
Thermal Stability ◽  
Tensile Strength ◽  
Composite Film ◽  
Breakdown Strength ◽  
Composite Films ◽  
Coupling Agents ◽  
Hybrid Films ◽  
Mechanical Method ◽  
Elongation At Break

PI/nano-Al2O3hybrid films were prepared by ultrasonic-mechanical method. Before addition, nano-Al2O3particles were firstly modified with different coupling agents. The micromorphology, thermal stability, mechanical properties, and electric breakdown strength of hybrid films were characterized and investigated. Results indicated that nano-Al2O3particles were homogeneously dispersed in the PI matrix by the addition of coupling agents. The thermal stability and mechanical properties of PI/nano-Al2O3composite films with KH550 were the best. The tensile strength and elongation at break of PI composite film were 119.1 MPa and 19.1%, which were 14.2% and 78.5% higher than unmodified PI composite film, respectively.

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