Effect of Gelatinization on Morphology and Thermal Properties of Polyvinyl Alcohol-Corn Starch Blend Films

2012 ◽  
Vol 724 ◽  
pp. 89-92
Author(s):  
Ji Wei Li ◽  
Xue Gang Luo ◽  
Xiao Yan Lin ◽  
Xian Hong Li
Keyword(s):  
Weight Loss ◽  
Thermal Properties ◽  
Polyvinyl Alcohol ◽  
Corn Starch ◽  
Casting Method ◽  
Scanning Calorimetry ◽  
Blend Films ◽  
Hydrogen Bonding Interactions ◽  
Gelatinized Starch ◽  
Solution Casting Method

The blend films of ungelatinized and gelatinized starch/polyvinyl alcohol (PVA) were prepared by solution casting method. Their morphologies and thermal properties were analyzed by scanning electron microscopy (SEM), differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA). A droplet phase was observed in the blends containing ungelatinized starch and a laminated phase was observed in the blends containing gelatinized starch. For both ungelatinized and gelatinized starch/PVA blends the melting temperature (Tm) (210230) of PVA was detected, and the Tm of gelatinized starch/PVA blends was higher than that of the ungelatinized starch/PVA blends. TGA results showed that over the rst 300 the weight loss for ungelatinized starch/PVA blends was higher than that for gelatinized starch/PVA blends, however the gelatinized starch/PVA blends showed the greater weight loss after scanning up to 400. Different morphologies and thermal properties of two types of blends were attributed to the different hydrogen bonding interactions between starch and polyvinyl alcohol.

XRD Analysis and Tensile Properties of Attapulgite Clay Filled Polyvinyl Alcohol/Corn Starch Blend Films

2012 ◽  
Vol 620 ◽  
pp. 99-104 ◽  
Author(s):  
Fairus Mazlia Mat Suki ◽  
Nur Azleen Azahari ◽  
Nadras Othman ◽  
Hanafi Ismail
Keyword(s):  
Polyvinyl Alcohol ◽  
Tensile Properties ◽  
Corn Starch ◽  
Tensile Modulus ◽  
Crystallinity Index ◽  
Xrd Analysis ◽  
Casting Method ◽  
Xrd Pattern ◽  
Blend Films ◽  
Solution Casting Method

Polyvinyl alcohol (PVOH) and corn starch (CS) blends were prepared with various amounts of attapulgite (AT) clay to form a series of PVOH/CS/AT blend films by using a solution casting method. The effect of AT on the XRD pattern and tensile properties of the composites were investigated. It was found that addition of AT in PVOH/CS blend has changed the crystallinity index of the blend films and thus influenced the tensile properties. PVOH/CS/AT1 blend films showed the highest crystallinity index and proved by the value of tensile strength and tensile modulus. The lowest crystallinity index is shown by the PVOH/CS/AT5 blend films.

scholarly journals Thermal Properties of Carbon Nanotube (CNT) Reinforced Polyvinyl Alcohol (PVA) Composites

2013 ◽  
Vol 17 ◽  
pp. 59-66 ◽  
Author(s):  
Monirul Hasan ◽  
Sujan Kumar Das ◽  
Jahid M.M. Islam ◽  
Md Abdul Gafur ◽  
Enamul Hoque ◽  
...  
Keyword(s):  
Thermal Properties ◽  
Carbon Nanotube ◽  
Polyvinyl Alcohol ◽  
Glass Transition Point ◽  
Casting Method ◽  
Thermo Gravimetric ◽  
Solar Cell Application ◽  
Gum Acacia ◽  
Thermal Analyzer ◽  
Solution Casting Method

Homogeneous Polyvinyl alcohol (PVA)/Carbon nanotube (CNT) composite has been prepared by solution casting method using gum acacia as a surfactant. CNT content in the composite was varied from 5-10% by weight. The thermal properties of PVA/CNT composites were investigated by Thermo Gravimetric/Differential Thermal Analyzer (TG/DTA) and Thermo Mechanical Analyzer (TMA). TG/DTA results showed that higher thermal stability in higher percentage of CNT in the composites. The 10% CNT containing PVA composite exhibit highest onset of melting, glass transition point and offset of melting temperature and the recoded values are 330.4K, 379K and 421.3K respectively. All of the result indicates that the developed PVA/CNT composite might be promising for use in solar cell application

scholarly journals Physico-Mechanical, Morphological Properties of Polyvinyl Alcohol/Palm Kernel Shell/Coconut Kernel Shell Elastomeric Polymer Nanocomposites

2018 ◽  
Vol 5 (2) ◽  
pp. 296-303
Author(s):  
Josephine Chang Hui Lai ◽  
Nor Liyana Yusof
Keyword(s):  
Polyvinyl Alcohol ◽  
Polymer Nanocomposites ◽  
Moisture Absorption ◽  
Palm Kernel ◽  
Morphological Properties ◽  
Test Results ◽  
Casting Method ◽  
Palm Kernel Shell ◽  
Coconut Kernel ◽  
Solution Casting Method

In this study, the physico-mechanical and morphological properties of polyvinyl alcohol/palm kernel shell/coconut kernel shell elastomeric polymer nanocomposites (PVA/PKS/CKS EPNCs) were investigated. PVA/PKS/CKS EPNCs were prepared via solution casting method and the properties of the elastomeric polymer nanocomposites were characterized through Fourier transform infrared (FTIR) spectroscopy, scanning electron microscopy (SEM), tensile testing and moisture absorption test. Test results showed that increasing the PVA content increased the mechanical properties of elastomeric polymer nanocomposites as well as provided better surface morphology. However, beyond certain percentage of PVA content, the moisture absorption increased too. Therefore, 55wt% of PVA/PKS/CKS EPNCs was chosen as the best elastomeric polymer nanocomposites as it had the best overall properties from the aspect of physico-mechanical, morphological and moisture absorption.

Comparison of Starch Fiber Filled-Polyvinyl Alcohol and Native Starch Filled-Polyvinyl Alcohol under Tensile Analysis

2015 ◽  
Vol 1113 ◽  
pp. 19-22 ◽  
Author(s):  
Mohd Salleh Shahrul Nizam ◽  
Norzila Mohd ◽  
Zarina Omar ◽  
Norkamruzita Saadon
Keyword(s):  
Tensile Strength ◽  
Polyvinyl Alcohol ◽  
Interfacial Adhesion ◽  
Continuous Phase ◽  
Distilled Water ◽  
Solution Casting ◽  
Test Results ◽  
Casting Method ◽  
Native Starch ◽  
Solution Casting Method

The tensile properties of starch fiber (SF) and native starch (NS) filled polyvinyl alcohol were investigated in this study. Polyvinyl Alcohol (PVA) was blend with starch fiber as well as native starch. Prior to compounding process, PVA was plasticized with 30 phr glycerol as well as 10 phr distilled water. A solution casting method was used to prepare the SF-PPVA and NS-PPVA film sheet. Based on the tensile test results SF filled PVA recorded the highest tensile strength (20.015 MPa) as compared to NS filled PVA (12.302MPa). The tensile strength of the blends film was depending to the interfacial adhesion between matrixes in the blends. In spite of that, NS filled PVA have noted the highest elongation during the test. SF and NS played important role in affecting the blends matrix through disturbing the arrangement of continuous phase of PVA.

scholarly journals Characterisation of Hyaluronic Acid Blends Modified by Poly(N-Vinylpyrrolidone)

Molecules ◽  
2021 ◽  
Vol 26 (17) ◽  
pp. 5233
Author(s):  
Katarzyna Lewandowska ◽  
Marta Szulc
Keyword(s):  
Hyaluronic Acid ◽  
Shear Thinning ◽  
Tensile Tests ◽  
Infrared Analysis ◽  
Shear Tests ◽  
Casting Method ◽  
Pronounced Increase ◽  
Blend Films ◽  
Solution Casting Method ◽  
Thinning Effect

The viscosity behaviour and physical properties of blends containing hyaluronic acid (HA) and poly(N-vinylpyrrolidone) (PVP) were studied by the viscometric technique, steady shear tests, tensile tests and infrared spectroscopy. Viscometric and rheological measurements were carried out using blends of HA/PVP with different HA weight fractions (0, 0.2, 0.5, 0.8 and 1). The polymer films and HA/PVP blend films were prepared using the solution casting method. The study of HA blends by viscometry showed that HA/PVP was miscible with the exception of the blend with high HA content. HA and its blends showed a shear-thinning flow behaviour. The non-Newtonian indices (n) of HA/PVP blends were calculated by the Ostwald–de Waele equation, indicating a shear-thinning effect in which pseudoplasticity increased with increasing HA contents. Mechanical properties, such as tensile strength and elongation at the break, were higher for HA/PVP films with wHA = 0.5 compared to those with higher HA contents. The elongation at the break of HA/PVP blend films displayed a pronounced increase compared to HA films. Moreover, infrared analysis confirmed the existence of interactions between HA and PVP. The blending of HA with PVP generated films with elasticity and better properties than homopolymer films.

scholarly journals Miscibility studies of polystyrene/polyvinyl chloride blend in presence of organoclay

2019 ◽  
Vol 17 (1) ◽  
pp. 927-935 ◽  
Author(s):  
Jumaa Aseeri ◽  
Naser M. Alandis ◽  
Waffa Mekhamer ◽  
Manawwer Alam
Keyword(s):  
Polyvinyl Chloride ◽  
Cetylpyridinium Chloride ◽  
X Ray Diffraction ◽  
Casting Method ◽  
Scanning Calorimetry ◽  
Local Clay ◽  
X Ray ◽  
Sem And Tem ◽  
Transmission Electron ◽  
Solution Casting Method

AbstractPolystyrene (PS)/ polyvinyl chloride (PVC) blends of different compositions, with and without organoclay (OC) were prepared by a solution casting method. PS and PVC were combined in ratios of 100/0, 90/10, 10/90, and 0/100. Local clay was treated with 0.5M NaCl to generate sodium clay (Na-clay). The Na-clay was subsequently modified using the cationic surfactant, cetylpyridinium chloride (CPC), at a concentration of 0.5 times that of Na-clay. The CPC-modified clay was denoted as organoclay (OC). The organoclay was dispersed in PS/PVC blends (90/10 and 10/90) with different weight percentages of OC (0%, 1%, 5%, and 10%). To evaluate the miscibility of PS/PVC blends, the blends with and without OC were characterized using Fourier-transform infrared (FTIR) spectroscopy, differential scanning calorimetry (DSC), X-ray diffraction (XRD), and scanning and transmission electron microscopy (SEM and TEM). The addition of OC to the PS/PVC blends produced exfoliated nanocomposites, as proven by XRD. The SEM and TEM micrographs showed that the PS/PVC(10/90) blend components were more miscible than those of the PS/PVC(90/10) blend, leading to favorable morphology.

STUDIES ON BIODEGRADATION OF CELLULOSE NANOFIBRIL REINFORCED STARCH/PVA BIOCOMPOSITE FILMS USING AEROBIC COMPOST ENVIRONMENT

2011 ◽  
Vol 10 (04n05) ◽  
pp. 1143-1146
Author(s):  
SONAKSHI MAITI ◽  
DEBARATI MITRA ◽  
DIPA RAY
Keyword(s):  
Cellulose Nanofibrils ◽  
X Ray Diffraction ◽  
Casting Method ◽  
Scanning Calorimetry ◽  
Xrd Study ◽  
Biocomposite Films ◽  
Structures And Properties ◽  
Significant Difference ◽  
Increasing Trend ◽  
Solution Casting Method

Starch/PVA biocomposite films reinforced with cellulose nanofibrils were prepared by solution casting method incorporating glycerol as a plasticizer. These biocomposite films along with unreinforced films were subjected to biodegradation in an aerobic compost pit. The extents of biodegradation of these films were studied in terms of persentage weight loss. The corresponding changes in the structures and properties of these biocomposites were investigated using Scanning Electron Microscopy (SEM), X-Ray Diffraction (XRD) study and Differential Scanning Calorimetry (DSC). The presence of fillers influenced the arrangement of the starch and PVA molecules in the film compared to that in the unreinforced film. A significant difference was observed in the nature of biodegradation of unreinforced and the reinforced films. The glass transition temperature, as observed from DSC, showed a decreasing trend, while the melting temperature showed an increasing trend after biodegradation. SEM micrographs revealed that the starch portions were consumed at a faster rate compared to polyvinyl alcohol, which was confirmed from XRD graphs also.

scholarly journals Preparation and Characterization of HPMC/PVP Blend Films Plasticized with Sorbitol

2013 ◽  
Vol 2013 ◽  
pp. 1-7 ◽  
Author(s):  
H. Somashekarappa ◽  
Y. Prakash ◽  
K. Hemalatha ◽  
T. Demappa ◽  
R. Somashekar
Keyword(s):  
Mechanical Properties ◽  
Hydroxypropyl Methylcellulose ◽  
Solution Casting ◽  
Casting Method ◽  
Elongation At Break ◽  
X Ray ◽  
Blend Films ◽  
X Ray Scattering ◽  
Solution Casting Method

The aim of this present work is to investigate the effect of plasticizers like Sorbitol on microstructural and mechanical properties of hydroxypropyl methylcellulose (HPMC) and Polyvinylpyrrolidone (PVP) blend films. The pure blend and plasticized blend films were prepared by solution casting method and investigated using wide angle X-ray scattering (WAXS) method. WAXS analysis confirms that the plasticizers can enter into macromolecular blend structure and destroy the crystallinity of the films. FTIR spectra show that there are a shift and decrease in the intensity of the peaks confirming the interaction of plasticizer with the blend. Mechanical properties like tensile strength and Young’s Modulus decrease up to 0.6% of Sorbitol content in the films. Percentage of elongation at break increases suggesting that the plasticized films are more flexible than pure blend films. These films are suitable to be used as environmental friendly and biodegradable packaging films.

Starch-Chitosan Blend Films Prepared by Glutaraldehyde Cross-Linking

2011 ◽  
Vol 415-417 ◽  
pp. 1626-1629 ◽  
Author(s):  
Feng Hong Li ◽  
Yan Ming Chen ◽  
Liang Li ◽  
Xiao Lin Bai ◽  
Shu Li
Keyword(s):  
Tensile Strength ◽  
Corn Starch ◽  
Crosslinking Agent ◽  
Endothermic Peak ◽  
Water Evaporation ◽  
Solvent Evaporation Method ◽  
Scanning Calorimetry ◽  
Blend Films ◽  
Dsc Studies ◽  
Higher Temperature

The present study evaluated the properties of the polymeric blend films obtained from chitosan and corn starch using glutaraldehyde as crosslinking agent and glycerol as plasticizer by the casting/solvent evaporation method. Fourier transform infrared (FTIR) analyses confirmed that the groups interactions of starch and chitosan in starch-chitosan blend films were present especially when using glutaraldehyde as crosslinking agent. Differential scanning calorimetry (DSC) studies revealed an endothermic peak of starch film at 98 oC corresponding to water evaporation. DSC also indicated that the endothermic peak of blend films moved to higher temperature with adding chitosan and glutaraldehyde compared with native corn starch film. The tensile strength of the blend films increased with the increasing content of glutaraldehyde. The starch-chitosan blend films exhibited the highest tensile strength of 11 MPa when the content of starch was 9% (w/v in water), glutaraldehyde content was 1.0 mL, chitosan ratio is 0.35 (wchitosan/wstarch), glycerol ratio was 0.35 (wglycerol /wstarch).

Biodegradation Studies of Attapulgite Clay Filled Polyvinyl Alcohol/Modified Corn Starch Blend Films: Microbial and Enzymatic

2013 ◽  
Vol 747 ◽  
pp. 668-672
Author(s):  
Fairus Mazlia Mat Suki ◽  
Nur Azleen Azahari ◽  
Nadras Othman ◽  
Hanafi Ismail ◽  
S. Sasidharan
Keyword(s):  
Polyvinyl Alcohol ◽  
Enzymatic Degradation ◽  
Corn Starch ◽  
Solution Casting ◽  
Blend Film ◽  
Casting Technique ◽  
Blend Films ◽  
Solution Casting Technique ◽  
Attapulgite Clay

Attapulgite Clay Filled Polyvinyl Alcohol/modified Corn Starch (PVOH/OCS/AT) Blend Films were Prepared by Solution Casting Technique. Biodegradability of the Blend Films were Determined by the Biodegradation in Microbial and Enzymatic Degradation. the Obtained Results Showed that the Addition of Attapulgite in Polyvinyl Alcohol/modified Corn Starch (PVOH/OCS) Blend Film has Changed the Biodegradability of the Film in both Microbial, Enzymatic Media. among all the Attapulgite-Filled Blends, PVOH/OCS/AT2 Blend Film Shows the Optimum Biodegradability Behavior because this Blend System Shows Highest DED and DMD Values.

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