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.

Silk Fibroin/Hyaluronic Acid Blend Film with Good Water Stability and Cytocompatibility

2013 ◽  
Vol 377 ◽  
pp. 209-214
Author(s):  
Ling Shuang Wang ◽  
Shu Qin Yan ◽  
Ming Zhong Li
Keyword(s):  
Cell Proliferation ◽  
Hyaluronic Acid ◽  
Silk Fibroin ◽  
Biomedical Applications ◽  
Water Resistance ◽  
High Water ◽  
Casting Method ◽  
Blend Ratio ◽  
Blend Films

Stimulating cell proliferation is a challenge in the field of silk fibroin-based biomaterials. In this study, silk fibroin/hyaluronic acid blend films were prepared by a casting method using carbodiimide as a cross-linking agent. Carbodiimide induced silk fibroin to form Silk I crystal structure which was not affected by the presence of hyaluronic acid. The films showed high water resistance. In vitro, the performance of these films was assessed by seeding L929 cells. The results indicated that the silk fibroin/hyaluronic acid blend films with the blend ratio of 80/20 and 60/40 promoted cell proliferation compared with the pure silk fibroin or hyaluronic acid film. These results suggest that silk fibroin/hyaluronic acid blend films are water stable and cytocompatible materials which are expected to be useful in biomedical applications.

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.

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.

Properties of water-soluble carboxymethyl chitosan film modified by hydrophobic poly(propylene glycol)

2013 ◽  
Vol 67 (4) ◽  
Author(s):  
Guo-Quan Zhu ◽  
Fa-Gang Wang ◽  
Yu-Ying Liu ◽  
Qiao-Chun Gao
Keyword(s):  
Propylene Glycol ◽  
Chemical Properties ◽  
Chitosan Film ◽  
Tensile Tests ◽  
Carboxymethyl Chitosan ◽  
Water Soluble ◽  
Scanning Calorimetry ◽  
Blend Films ◽  
Solution Casting Method ◽  
Poly Propylene

AbstractA series of water-soluble carboxymethyl chitosan (CMCS)/poly(propylene glycol) (PPG) blend films with various CMCS/PPG mole ratios were prepared by the solution casting method. Morphology of the CMCS/PPG blend films was investigated by scanning electron microscopy (SEM). Thermal, mechanical, and chemical properties of the CMCS/PPG blend films were studied by differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), tensile tests, and contact angle tests. It was found that the introduction of PPG can markedly affect the morphology and the properties of CMCS films.

scholarly journals Isolation, Characterization, and Application of Nanocellulose from Oil Palm Empty Fruit Bunch Fiber as Nanocomposites

2014 ◽  
Vol 2014 ◽  
pp. 1-9 ◽  
Author(s):  
N. S. Lani ◽  
N. Ngadi ◽  
A. Johari ◽  
M. Jusoh
Keyword(s):  
Mechanical Performance ◽  
Empty Fruit Bunch ◽  
Casting Method ◽  
Elongation At Break ◽  
Blend Films ◽  
Solution Casting Method ◽  
Starch Films ◽  
Sustainable Materials ◽  
Scientific Attention ◽  
Different Content

Nanocomposites, consisting of a polymeric matrix and nanosized elements as reinforcement, have attracted significant scientific attention because of their high mechanical performance. A large variety of nanocomposites have been prepared using bio-based materials as a matrix and nanoreinforcement, so that it can reduce the dependence on nondegradable products and move to a sustainable materials basis. The objective of this study was to isolate nanocellulose from empty fruit bunch (EFB) fiber and their reinforcing effect on polyvinyl alcohol (PVA)/starch blend films. A series of PVA/starch films with different content of nanocellulose were prepared by solution casting method. Nanocellulose fiber with diameters ranging from 4 to 15 nm has been successfully prepared. On the other hand, PVA/starch films reinforced with nanocellulose fiber possess significantly improved properties compared to unreinforced film. From the results, PVA/starch films with the addition of 5% (v/v) of nanocellulose exhibited best combination of properties. This nanocomposite was found to have tensile strength at about 5.694 MPa and elongation at break was 481.85%. In addition to good mechanical properties, this nanocomposite has good water resistance and biodegradability.

scholarly journals Antimicrobial gelatin/sericin/clay films for packaging of hygiene products

2019 ◽  
Vol 39 (8) ◽  
pp. 744-751 ◽  
Author(s):  
Roli Purwar ◽  
Anjali Verma ◽  
Radhika Batra
Keyword(s):  
Transmission Rate ◽  
Crosslinking Agent ◽  
Antimicrobial Properties ◽  
Solution Casting ◽  
Casting Method ◽  
Soil Burial Test ◽  
Soil Burial ◽  
Blend Films ◽  
Modified Montmorillonite ◽  
Solution Casting Method

Abstract In this study we have prepared flexible gelatin/sericin/clay blend films for packaging applications of hygiene products. Gelatin/sericin (3:1, 1:1 and 1:3 w/w ratios) films were prepared using glutaraldehyde as a crosslinking agent and glycerol as a plasticizer by the solution casting method. The concentrations of gelatin and sericin were optimized on the basis of their mechanical properties. Closite 30B and copper-modified montmorillonite clay (with concentration of 1–5%) were incorporated into the optimized gelatin/sericin blend films in order to improve the mechanical and antimicrobial properties. The water vapor transmission rate of the film samples was also studied. The soil burial test showed very good biodegradability of the blends films. The antimicrobial testing revealed efficient activity of these blend films against Gram-positive (Staphylococcus aureus) and Gram-negative (Escherichia coli) bacteria. Hence, on the basis of the above-mentioned properties, these films can be considered as promising candidates for packaging of hygiene maintenance products.

Effects of different gums on tensile properties of cellulose nanofibrils (CNFs)-reinforced starch

2020 ◽  
pp. 096739112092344 ◽  
Author(s):  
Razieh Eslami ◽  
Alireza Azizi ◽  
Mohsen Najafi
Keyword(s):  
Mechanical Properties ◽  
Tensile Properties ◽  
Food Packaging ◽  
Negative Impact ◽  
Cellulose Nanofibrils ◽  
Tensile Tests ◽  
Nanocomposite Films ◽  
Infrared Analysis ◽  
Solution Casting Method ◽  
Starch Films

This research is focused on the development of a new starch-based nanocomposite films reinforced with cellulose nanofibrils (CNFs) for food packaging purposes. A series of starch films were produced by the solution casting method with various concentrations of glycerin, CNF, and citric acid (CA). Mechanical properties of the films were investigated using tensile tests. Based on the results, the best formulation with optimal mechanical properties was introduced by different amounts of various gums to study the effects of the gums on tensile properties of the samples. Fourier-transform infrared analysis was performed to study posttreatment chemical structure of the sample to confirm the cross-linking and esterifying of the nanocomposite films. Results revealed that the tragacanth gum had a negative impact on the mechanical properties, while the frankincense gum (F-gum) and Arabic gum positively influenced the mechanical properties through strengthening the network structure. The sample containing 0.3 g of F-gum (10% w/w, relative to the starch weight) showed the best results compared to the control films.

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.

Formulation and Evaluation of Chitosan-Polyaniline Nanocomposites for Controlled Release of Anticancer Drug Doxorubicin

2018 ◽  
Vol 8 (2) ◽  
Author(s):  
Dillip Kumar Behera ◽  
Kampal Mishra ◽  
Padmolochan Nayak
Keyword(s):  
Tensile Strength ◽  
Drug Release ◽  
Nanocomposite Films ◽  
Casting Method ◽  
Sustained Drug Release ◽  
In Vitro Drug Release ◽  
Clay Particles ◽  
Solution Casting Method ◽  
Nanoclay Content

In this present work, chitosan (CS) crosslink with polyaniline (PANI) with montmorilonite (MMT) called as (CSPANI/MMT) and CS crosslink with PANI without MMT called as (CS-PANI) were prepared by employing the solution casting method. Further the formation of nanocomposites CS-PANI/MMT and CS-PANI were investigated using XRD, FTIR, SEM and tensile strength. Water uptake and swelling ratio of the CS-PANI and CS-PANI/MMT were found to decrease with increase in concentration of clay. Mechanical properties of the CS-PANI and CS-PANI/MMT were assessed in terms of tensile strength and extensibility using texture analyzer. Increase in tensile strength and reduction in extensibility was reported with increase in the nanoclay content. In vitro drug release study on CS-PANI and CS-PANI/MMT indicated pronounced sustained release of doxorubicin by the incorporation of clay particles in the CS polymer matrix. Overall CSPANI/MMT nanocomposite films exhibited improved mechanical and sustained drug release properties than CS-PANI.

scholarly journals Fabrication and characterization of poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) modified with nano-montmorillonite biocomposite

e-Polymers ◽  
2020 ◽  
Vol 21 (1) ◽  
pp. 038-046
Author(s):  
Xu Yan ◽  
Wanru Zhou ◽  
Xiaojun Ma ◽  
Binqing Sun
Keyword(s):  
Thermal Stability ◽  
Oxygen Permeability ◽  
Water Vapor Permeability ◽  
Barrier Properties ◽  
Nucleating Agent ◽  
Vapor Permeability ◽  
Casting Method ◽  
Increasing Trend ◽  
Solution Casting Method

Abstract In this study, a poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) modified with nano-montmorillonite biocomposite (MMT/PHBH) was fabricated by solution-casting method. The results showed that the addition of MMT increased the crystallinity and the number of spherulites, which indicated that MMT was an effective nucleating agent for PHBH. The maximum decomposition peak of the biocomposites moved to a high temperature and residue presented an increasing trend. The biocomposites showed the best thermal stability at 1 wt% MMT. Compared with PHBH, 182.5% and 111.2% improvement in elastic modulus and tensile strength were obtained, respectively. Moreover, the oxygen permeability coefficient and the water vapor permeability of MMT/PHBH biocomposites decreased by 43.9% and 6.9%, respectively. It was also found that the simultaneous enhancements on the crystallizing, thermal stability, mechanical, and barrier properties of biocomposites were mainly caused by the formation of intercalated structure between PHBH and MMT.

Sign in / Sign up

Export Citation Format

Share Document