Chemically modified natural rubber latex - poly(vinyl alcohol) blend membranes for organic dye release

Jayadevan, Janisha; Alex, Rosamma; Gopalakrishnapanicker, Unnikrishnan

doi:10.1016/j.reactfunctpolym.2017.01.001

Cited by 23 publications

(3 citation statements)

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“…The anti-microbial study was carried out by using an agar diffusion method [ 25 ]. The NR/CT biocomposite films were cut with the dimensions of 10 mm × 10 mm and placed on a Mueller Hinton agar medium (Merck, Germany), which had been previously seeded with 105 cfu/mL (Colony Forming Units/mL) of inoculums containing the tested bacterium ( S. aureus ).…”

Section: Methodsmentioning

confidence: 99%

Chitosan and Natural Rubber Latex Biocomposite Prepared by Incorporating Negatively Charged Chitosan Dispersion

2020

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Generally, natural rubber/chitosan (NR/CT) biocomposites could be prepared by either mixing natural rubber latex (NRL) with CT acid solution or mixing dry NR with CT powder on mixing equipment. In the present work, a new mixing method has been proposed and properties of the obtained NR/CT biocomposites are investigated. CT particles were prepared to have a negative charge that could be dispersed in water by using a ball mill before mixing with NRL. The effects of CT loading varied from 0 to 8 phr on latex properties and physical properties of NR/CT biocomposite films were focused. The results showed that the viscosity of NRL increased with increasing CT loading. With increasing CT loading from 0 to 8 phr, 300% modulus of the NR/CT biocomposite film increased, whereas the opposite trend was found for elongation at break. Additionally, the presence of CT in the biocomposite resulted in an increased elastic modulus (E’) in conjunction with enhanced antibacterial activity against Staphylococcus aureus (S. aureus).

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Section: Methodsmentioning

confidence: 99%

Chitosan and Natural Rubber Latex Biocomposite Prepared by Incorporating Negatively Charged Chitosan Dispersion

2020

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“…В оптимизированных условиях с применение ОППк нами получен коагулюм каучука СКС-30 АРК. Согласно требованиям ГОСТ Р 54554-2011 проведены исследования физико-механических показателей вулканизатов [13][14][15][16][17][18][19][20], полученных на его основе (таблица 4).…”

Section: результатыunclassified

Waste of brewing production - a coagulating agent in the technology of extraction of emulsion rubbers from latex

Sannikova,

Vlasova,

Nechesova

et al. 2022

Vestn. Voronež. gos. univ. inž. tehnol.

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Today, there is a growing interest in the production of synthetic polymers, which are widely used in the production of modern materials. Of particular interest is the manufacture of rubbers by emulsion polymerization. Rubber compounds and vulcanizates made on their basis have characteristics due to which they are actively used in various industrial sectors. The coagulation process in the production of emulsion polymers increases environmental stress. Sodium chloride used at some enterprises as a coagulating agent is consumed in large quantities - up to 200 kg / t of rubber, and increases environmental pollution. In the presented work, for the first time, the possibility of recycling the beer production residue - inactivated yeast, which is proposed to be used to reduce the aggregative stability of disperse systems, is considered. The introduction of yeast into the emulsion polymer isolation technology makes it possible to reduce the amount of sodium chloride in the waters discharged from the enterprise. The use of a system based on a protein coagulant contributes to the complete release of coagulum from latex at a consumption of inactivated yeast in the amount of 10-15 kg/t of rubber. The most effective results were obtained when yeast preliminarily acidified with sulfuric acid was used in this process, which led to the charging of the nitrogen atom of the protein component. It is noted that the best temperature regime for the process of coagulation of latex particles is 1-20 ℃. An increase in temperature to 60 ℃ leads to an increase in the consumption of coagulant up to 25 kg/t of rubber. The ratios of the consumption of sulfuric acid and acidified yeast have been optimized, allowing to obtain the most complete coagulation of the latex. It has been established that the rubbers isolated using food production waste meet the requirements for rubbers of the SKS-30ARK brand according to the main physical and mechanical indicators.

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“…However, crosslinking process reduces the hydrophilicity of PVA membranes as well as their permeability. Although several alternative modifications have been used to address the reduced hydrophilicity and permeability of c-PVA membranes, e.g., grafting [2,5,13,14], blending [5,8,14] and filling with fine inorganic particles [1,[15][16][17][18][19][20][21], the use of efficient, eco-friendly green methods for the preparation of c-PVA membranes to minimize or eliminate undesired chemicals [22][23][24][25][26][27] is important, since in the last decade, increasing environmental awaerness needs to use eco-friendly methods.…”

Section: Introductionmentioning

confidence: 99%

Use of Ultrasound to Prepare Permeable Crosslinked PVA Membranes

Asman

Çakıcı²,

Solak³

et al. 2020

Gazi University Journal of Science

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Chemically modified natural rubber latex - poly(vinyl alcohol) blend membranes for organic dye release

Cited by 23 publications

References 50 publications

Chitosan and Natural Rubber Latex Biocomposite Prepared by Incorporating Negatively Charged Chitosan Dispersion

Chitosan and Natural Rubber Latex Biocomposite Prepared by Incorporating Negatively Charged Chitosan Dispersion

Waste of brewing production - a coagulating agent in the technology of extraction of emulsion rubbers from latex

Use of Ultrasound to Prepare Permeable Crosslinked PVA Membranes

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