Self‐crosslinkable hydroxylated natural rubber/carboxymethyl starch blend and its properties

Chooprayoon, P.; Boochathum, Ploenpit

doi:10.1002/app.47271

Cited by 11 publications

(2 citation statements)

References 33 publications

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“…The crosslink density of the VNR‐OH films was also evaluated by swelling method 13 . The samples (20 × 20 × 1.4 mm 3 ) were accurately weighed and then immersed in toluene for 48 h in a closed vessel at room temperature.…”

Section: Methodsmentioning

confidence: 99%

“…Natural rubber (NR), a sustainably renewable agricultural material, is mainly produced in tropical countries. It has been used in various applications owing to its high‐performance properties, such as a good elasticity, high tensile strength, and excellent mechanical properties 13 . However, the price of NR has dropped since 2017 due to oversupply and the weak global economy reducing the demand from the main consumers, in particular the automobile industry in period of the COVID‐19 pandemic crisis 14 .…”

Section: Introductionmentioning

confidence: 99%

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Fabrication of superhydrophobic natural rubber film via grafting of methyltrichlorosilane

Ngamdee

Yimmut

Hinchiranan

2021

Polymers for Advanced Techs

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Nowadays, natural rubber (NR) is extensively applied in medical‐healthcare devices. A clogging or bacterial attachment onto product's surface can be avoided by creating the non‐fouling surface for extending the NR utilization. Herein, a superhydrophobic NR film was prepared using two‐step surface modification involving sulfuric acid (H2SO4)‐catalyzed hydration to form hydroxyl (OH) functional groups on the rubber surface followed by grafting with methyltrichlorosilane (MTCS). From X‐ray photoelectron spectroscopy analysis, the immersion of a vulcanized NR film (VNR) in 75 wt% H2SO4 solution for 1 h showed the highest area portion of OH groups on the VNR surface (50.9%), which were expected to act as the active sites for grafting with MTCS via hydrolysis and polycondenzation to obtain a VNR‐OH‐MTCS film. As a measure of the hydrophobicity, the water contact angle (WCA) of the VNR‐OH‐MTCS film prepared by using 2 wt% MTCS concentration was greatest at 155° with a high roughness of 1790 nm. The glass transition temperature and antimicrobial activity of the VNR film were not affected by these surface modifications. This indicated that the superhydrophobic VNR‐OH‐MTCS film maintained the flexibility with ability to inhibit the formation of a bacterial biofilm. Not only superhydrophobicity, the VNR‐OH‐MTCS film also had oleophilicity (oil absorption capacity [k] of 1.13) suggesting that it could be applied for oil/water separation with high separation efficiency of 98.6%. Moreover, the VNR‐OH‐MTCS film still had high hydrophobicity with WCA of 138°–142° after 20 abrasion cycles using a sandpaper under the weighting load not over than 50 g.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Fabrication of superhydrophobic natural rubber film via grafting of methyltrichlorosilane

Ngamdee

Yimmut

Hinchiranan

2021

Polymers for Advanced Techs

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Effect of pH on the physicochemical properties of starch films

Sakkara

Nataraj

Venkatesh³

et al. 2019

J of Applied Polymer Sci

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We demonstrate a simple approach of using highly alkaline starch solutions to obtain films with high flexibility and improved water resistance. Extensive studies have been done to develop films from starch, primarily for food applications. However, films developed from starch are brittle and generally chemical modifications or plasticizers are used to improve the flexibility and other properties of starch films. Such modifications make starch expensive, decrease biodegradability, and affect the morphology and subsequent processing of starch. In this research, we have prepared films using starch solutions at pH between 3 and 11. Starch solutions having different pHs were made into films and the tensile, thermal properties, and resistance to water were studied. It was found that preparing starch with pH 11 solution imparts high flexibility without any apparent physical damage. Films prepared under strong acidic and alkaline conditions also had considerably reduced hydrophilicity, which is required for food packaging and other applications. The films prepared at alkaline pH show nearly 50% reduction in water sorption and an increase in elongation. The films obtained from alkaline pH are flexible and water resistant and can potentially be used to develop various bioproducts. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020, 137, 48563.

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Preparation, properties, and antibacterial application of dialdehyde carboxymethyl cross‐linked sesbania gum

Jiang,

Tang,

et al. 2024

Journal of Polymer Science

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Suitably modified sesbania gum as a biodegradable functional biomaterials was very attractive in many applications. Therefore, a combination of cross‐linking, carboxymethylation, and oxidation was chosen to modify sesbania gum (SG) to expand its use. The experimental results indicated that cross‐linking could be completed not only on SG particles, but also between different SG particles. The cross‐linking decreased the number of surface hydroxyl groups on SG. The sedimentation volume decreased with the increase of phosphorus content of cross‐linked sesbania gum (CLSG). The structure of SG particles was severely disrupted by carboxymethylation and oxidation, while the structure was less affected by cross‐linking. The viscosities of SG and modified SG paste in acidic medium were less than those in neutral medium, while their viscosities in alkaline medium were more than those in neutral medium. Cross‐linking, carboxymethylation, and oxidation could ameliorate the retrogradation of SG, but decrease its swelling power, freeze–thaw stability, acid, and alkaline resistance. The aldehyde groups had good antibacterial activity against Trichoderma harzianum, whereas the carboxymethyl groups and phosphate ester groups showed poor antimicrobial activity against T. harzianum.

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Self‐crosslinkable hydroxylated natural rubber/carboxymethyl starch blend and its properties

Cited by 11 publications

References 33 publications

Fabrication of superhydrophobic natural rubber film via grafting of methyltrichlorosilane

Fabrication of superhydrophobic natural rubber film via grafting of methyltrichlorosilane

Effect of pH on the physicochemical properties of starch films

Preparation, properties, and antibacterial application of dialdehyde carboxymethyl cross‐linked sesbania gum

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