scholarly journals The influence in difference of compatibilizers on the mechanical and rheological properties of LDPE/PLST blends

2021 ◽  
Vol 2063 (1) ◽  
pp. 012009
Author(s):  
Tahseen A Saki
Keyword(s):  
Rheological Properties ◽  
Allyl Alcohol ◽  
Molecular Structures ◽  
Poly Vinyl Alcohol ◽  
Packaging Film ◽  
Rheological Measurement ◽  
Elongation At Break ◽  
Oh Groups ◽  
Measurement Results ◽  
Copolymer Poly

Abstract In this present study, low density polyethylene/plasticizer starch (LDPE/PLST) blends were prepared as a product to be used in disposable packaging (film applications), reducing the negative polymeric environmental effect. Because of their different molecular structures, LDPE blends with starch are fully immiscible; therefore, a compatibility agent is required. Three different polymer and/or copolymer: poly (vinyl alcohol) hydrolyzed 75% (PVOH), styrene-allyl alcohol copolymer (SAA) and polyethylene glycol (PEG) were selected as compatibilizers containing –OH groups. The effects of compatibilizer on the mechanical and rheological properties of LDPE/PLST blends were investigated and compared to LDPE/PLST without compatibilzer. The blends are also characterized by FTIR, which strongly indicates the existence of compatibilizers that can enhance phase interaction and promote compatibility in the blends of LDPE/PLST. Comparing to the blend without a compatibilizer, the tensile strengths of the blends containing PVOH and SAA increased significantly. The elongation at break results shows similar observation. The rheological measurement results suggested that the addition of a compatibilizer exhibited an increase in the shear stress and apparent viscosity comparing to the uncompatibilized blend except the blend with PEG which exhibited phase separation.

Cellulose Based Electrospun Nanofilters: Perspectives On Tannery Effluent Waste Water Treatment

2021 ◽  
Author(s):  
Senthil Rethinam ◽  
Sardar Batıkan Kavukcu ◽  
Thiagarajan Hemalatha ◽  
A.Wilson Aruni ◽  
Aylin Sendemir
Keyword(s):  
Metal Ions ◽  
Waste Water Treatment ◽  
Toxic Metal ◽  
Poly Vinyl Alcohol ◽  
Tannery Effluent ◽  
Tea Leaves ◽  
Leather Industry ◽  
Elongation At Break ◽  
Hazardous Metal ◽  
Effluent Waste

Abstract Development of nanofilters with the capability to remove toxic metal ions from effluent wastewater will be of immense help to the leather industry. In this study, fibrous nanofilter (FNF) was prepared using micro cellulosic fiber (MCF) and tea leaves microparticles (TLM) blended in poly (vinyl) alcohol (PVA). FNF was analysed for its efficacy to remove hazardous metals from tannery effluent wastewater. The FNF had promising traits of tensile strength (19.24+0.05 Mpa), elongation at break (22.31+0.12 %), flexibility (10.88+0.05 %), water absorption (37.86+0.14 %) and desorption (32.54+0.33 %). The metal adsorption studies clearly reflected the removal of toxic Cr (VI) ions from the effluent water by FNF. The study establishes an economically feasible and highly efficient way to remove hazardous metal ions from effluent wastewater.

scholarly journals Electrospinning of Cellulose Nanocrystal-Filled Poly (Vinyl Alcohol) Solutions: Material Property Assessment

Nanomaterials ◽  
2019 ◽  
Vol 9 (5) ◽  
pp. 805 ◽  
Author(s):  
J. Elliott Sanders ◽  
Yousoo Han ◽  
Todd S. Rushing ◽  
Douglas J. Gardner
Keyword(s):  
Vinyl Alcohol ◽  
Fiber Diameter ◽  
Morphological Structure ◽  
Poly Vinyl Alcohol ◽  
Oh Groups ◽  
Heat Treated ◽  
Property Assessment ◽  
Vinyl Group ◽  
Random Composite ◽  
Scanning Electron

Poly (vinyl alcohol) (PVA) and cellulose nanocrystals (CNC) random composite mats were prepared using the electrospinning method. PVA/CNC mats were reinforced with weight concentrations of 0, 20 and 50% CNC (w/w) relative to PVA. Scanning electron microscopy was used to measure the fiber diameter, which ranged from 377 to 416 nm. Thermogravimetric analysis (TGA) confirmed the presence of CNC fibers in the mat fibers which were not visible by scanning electron microscope (SEM). Mechanical testing was conducted using ASTM D 638 on each sample group at 10 mm min−1. Neat PVA and PVA/CNC mats were heat treated at 170 °C for 2h hours, and the morphological structure was maintained with some fiber diameter reduction. Mechanical property results after heat treatment showed a decrease in tensile strength, an increase in tensile stiffness and a decrease in strain to yield (%). This effect was attributable to enhanced diffusion bonding of the mat fiber intersections. The CNC fibers also increased mat stiffness, and reduced strain to yield in non-treated mats. The use of CNCs show potential for compounding into bulk polymer composites as a reinforcement filler, and also show promise for chemical crosslinking attributable to the –OH groups on both the PVA, in addition to esterification of the vinyl group, and CNC.

Research on the Effect of Polycarboxylate Superlasticizers on Reheology Properties of Compound Cementitious System

2011 ◽  
Vol 477 ◽  
pp. 151-156 ◽  
Author(s):  
Dong Min Wang ◽  
Zhi Hua Liu ◽  
Wei Feng Xiong
Keyword(s):  
Molecular Structure ◽  
Rheological Property ◽  
Rheological Properties ◽  
Molecular Structures ◽  
Mineral Admixture ◽  
Dispersion Property ◽  
Cementitious System ◽  
Adsorption Amount ◽  
Polymer Surfactants ◽  
Cementitious Systems

The rheological property is the best method which can directly reflect the dispersion property of polymer surfactants. In this paper, the rheological properties in the systems of pure cement, cement/fly ash and cement/silica fume with polycarboxylate superplasticizers of different molecular structures were studied. The effect of molecular structure on shear sress, apparent viscosity and thixotropy in compound cementitious systems was expatiated. At last, the rules of mineral admixture to the system’ rheological property and the relations between adsorption amount and rheological properties were put forward.

scholarly journals Analysis of Structural and Functional Differences of Glucans Produced by the Natively Released Dextransucrase of Liquorilactobacillus hordei TMW 1.1822

2020 ◽  
Vol 193 (1) ◽  
pp. 96-110 ◽  
Author(s):  
Jonas Schmid ◽  
Daniel Wefers ◽  
Rudi F. Vogel ◽  
Frank Jakob
Keyword(s):  
Molecular Weight ◽  
Secondary Structure ◽  
Rheological Properties ◽  
Viscoelastic Fluid ◽  
Size Structure ◽  
Molecular Size ◽  
Molecular Structures ◽  
Rheological Measurements ◽  
Functional Differences ◽  
Functionally Diverse

AbstractThe properties of the glucopolymer dextran are versatile and linked to its molecular size, structure, branching, and secondary structure. However, suited strategies to control and exploit the variable structures of dextrans are scarce. The aim of this study was to delineate structural and functional differences of dextrans, which were produced in buffers at different conditions using the native dextransucrase released by Liquorilactobacillus (L.) hordei TMW 1.1822. Rheological measurements revealed that dextran produced at pH 4.0 (MW = 1.1 * 108 Da) exhibited the properties of a viscoelastic fluid up to concentrations of 10% (w/v). By contrast, dextran produced at pH 5.5 (MW = 1.86 * 108 Da) was gel-forming already at 7.5% (w/v). As both dextrans exhibited comparable molecular structures, the molecular weight primarily influenced their rheological properties. The addition of maltose to the production assays caused the formation of the trisaccharide panose instead of dextran. Moreover, pre-cultures of L. hordei TMW 1.1822 grown without sucrose were substantial for recovery of higher dextran yields, since the cells stored the constitutively expressed dextransucrase intracellularly, until sucrose became available. These findings can be exploited for the controlled recovery of functionally diverse dextrans and oligosaccharides by the use of one dextransucrase type.

Macro- and Microscale Rheological Properties of Poly(vinyl alcohol) Aqueous Solutions

2011 ◽  
Vol 115 (12) ◽  
pp. 2759-2764 ◽  
Author(s):  
Keith M. Krise ◽  
Angela A. Hwang ◽  
David M. Sovic ◽  
Bratoljub H. Milosavljevic
Keyword(s):  
Aqueous Solutions ◽  
Rheological Properties ◽  
Vinyl Alcohol ◽  
Poly Vinyl Alcohol

Synthesis and rheological properties of hydrophobically modified poly(vinyl alcohol)

2012 ◽  
Vol 19 (12) ◽  
Author(s):  
Qiaoman Hu ◽  
Guangsu Huang ◽  
Jing Zheng ◽  
Heng Su ◽  
Chao Guo
Keyword(s):  
Rheological Properties ◽  
Vinyl Alcohol ◽  
Poly Vinyl Alcohol ◽  
Hydrophobically Modified

scholarly journals Rheological Properties of Commercially Available Hyaluronic Acid Products in the United States for the Treatment of Osteoarthritis Knee Pain

2018 ◽  
Vol 11 ◽  
pp. 117954411775162 ◽  
Author(s):  
Mathew Nicholls ◽  
Ajay Manjoo ◽  
Peter Shaw ◽  
Faizan Niazi ◽  
Jeffrey Rosen
Keyword(s):  
United States ◽  
Hyaluronic Acid ◽  
Rheological Properties ◽  
Cone Angle ◽  
The United States ◽  
Molecular Structures ◽  
Rheological Parameters ◽  
Future Research ◽  
Knee Oa ◽  
Semidilute Solution

Objective: The inconsistent results within the current literature regarding the efficacy of intra-articular-hyaluronic acid (IA-HA) for the treatment of knee osteoarthritis (OA) have been suggested to be due to intrinsic differences between individual HA products. The purpose of this investigation is to define the rheological differences between currently available HA products in the United States at the time of this study for the treatment of knee OA, which will help elaborate on the appropriateness of classifying HA products as a class opposed to as individual agents. Methods: The rheological parameters for Euflexxa, Orthovisc, Supartz, Monovisc, Synvisc, Synvisc-One, Gel-One, and Hyalgan were obtained with a TA AR 2000 EX Rheometer with a cone-plate geometry (40-mm plate diameter and a 2° cone angle) at room temperature. Results: The bulk rheological parameters of the different products suggest molecular structures traversing the range of dilute solution (Hyalgan, Supartz), semidilute solution (Euflexxa, Orthovisc), entangled solutions (Monovisc, Synvisc, Synvisc-One), and even gel-like (Gel-One) behavior. Conclusions: Due to the differences in rheological properties between IA-HA products, the universal assessment of these products as a class may not be appropriate. Instead, it may be more appropriate to assess each product individually. Future research should aim to link these differences in rheological properties to the differences in clinical efficacy seen across these IA-HA products.

Impact of Lithium halides on rheological properties of aqueous solution of poly(vinyl alcohol)

2020 ◽  
Vol 27 (8) ◽  
Author(s):  
Riza Asmaa Saari ◽  
Ryota Maeno ◽  
Ryosuke Tsuyuguchi ◽  
Warinda Marujiwat ◽  
Panitha Phulkerd ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Rheological Properties ◽  
Vinyl Alcohol ◽  
Poly Vinyl Alcohol ◽  
Lithium Halides

Interactions between PA6 Ratio and Tensile Properties in PVA/PA6 Hybrid Nanofiber Yarns

2017 ◽  
Vol 14 ◽  
pp. 25-37 ◽  
Author(s):  
Aref Fakhrali ◽  
Seyed Vahid Ebadi ◽  
Ali Akbar Gharehaghaji ◽  
Masoud Latifi ◽  
Abdolrasool Moghassem
Keyword(s):  
Electron Microscope ◽  
Tensile Properties ◽  
Hybrid Model ◽  
Polyamide 6 ◽  
Tensile Behavior ◽  
Poly Vinyl Alcohol ◽  
Elongation At Break ◽  
Hybrid Yarn ◽  
Hybrid Nanofiber ◽  
Scanning Electron

In this study, we fabricated poly vinyl alcohol/polyamide 6 (PVA/PA6) hybrid nanofiber yarns and examined the influence of PA6 content on tensile properties of hybrid nanofiber yarns. The surface morphology of nanofiber yarns was studied by scanning electron microscope (SEM). The average diameters of nanofibers in pure PA6 and pure PVA nanofibers yarns were 83±12 nm and 187±21 nm, respectively. The results showed that the strength of hybrid yarns was descending for PA6 contents below 16.5 % and ascending for higher contents. Also, by increasing the PA6 ratio in the hybrid yarn, the elongation at break was decreased. Three various models including: Hamburger, simple rule of mixtures (ROM) and hybrid models were applied to predict the tensile behavior of hybrid yarns. This study showed that neither ROM nor Hamburger’s models were capable of predicting the tensile properties of hybrid yarns. Whiles, hybrid model can predict properties with the lowest error (6.44 % error in strength values and 13.06 % error in elongation values prediction). Moreover, this model was modified further for higher performance. Our results demonstrate that the hybrid model can be applied in engineered tensile properties of nanofibrous yarns.

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