Temperature-responsive N-isopropylacrylamide-grafted natural rubber

Nuntahirun, Pattaraporn; Yamamoto, Oraphin; Paoprasert, Peerasak

doi:10.1007/s00289-017-2099-7

Cited by 7 publications

(7 citation statements)

References 47 publications

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“…The decomposition at 70–175 °C was found due to the loss of water in the samples. The weight loss between 175–290 °C corresponded to the decomposition of the carboxylic acid and amide side groups of the PAA- co -PAM chains [ 43 ]. The DPNR and polymer backbone of PAA- co -PAM decomposed at a temperature between 336 and 475 °C.…”

Section: Resultsmentioning

confidence: 99%

Preparation of Crosslinked Poly(acrylic acid-co-acrylamide)-Grafted Deproteinized Natural Rubber/Silica Composites as Coating Materials for Controlled Release of Fertilizer

et al. 2023

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The crosslinked poly(acrylic acid-co-acrylamide)-grafted deproteinized natural rubber/silica ((PAA-co-PAM)-DPNR/silica) composites were prepared and applied as coating materials for fertilizer in this work. The crosslinked (PAA-co-PAM)-DPNR was prepared via emulsion graft copolymerization in the presence of MBA as a crosslinking agent. The modified DPNR was mixed with various contents of silica (10 to 30 phr) to form the composites. The existence of crosslinked (PAA-co-PAM) after modification provided a water adsorption ability to DPNR. The swelling degree values of composites were found in the range of 2217.3 ± 182.0 to 8132.3 ± 483.8%. The addition of silica in the composites resulted in an improvement in mechanical properties. The crosslinked (PAA-co-PAM)-DPNR with 20 phr of silica increased its compressive strength and compressive modulus by 1.61 and 1.55 times compared to the unloaded silica sample, respectively. There was no breakage of samples after 80% compression strain. Potassium nitrate, a model fertilizer, was loaded into chitosan beads with a loading percentage of 40.55 ± 1.03% and then coated with the modified natural rubber/silica composites. The crosslinked (PAA-co-PAM)-DPNR/silica composites as the outer layers had the ability of holding water in their structure and retarded the release of fertilizer. These composites could be promising materials for controlled release and water retention that would have potential for agricultural application.

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Section: Resultsmentioning

confidence: 99%

Preparation of Crosslinked Poly(acrylic acid-co-acrylamide)-Grafted Deproteinized Natural Rubber/Silica Composites as Coating Materials for Controlled Release of Fertilizer

et al. 2023

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“…For the P10-DPNR and P30-DPNR, the weight loss at 70–170 °C was attributed to the loss of water in the modified DPNR samples. A minor decomposition at 170–291 °C due to the breakage of the carboxylic and amide side groups of the grafted polymer was also observed [ 58 ]. An increase in weight loss during minor decomposition was observed when the grafting percentage increased.…”

Section: Resultsmentioning

confidence: 99%

Preparation of Poly(acrylic acid-co-acrylamide)-Grafted Deproteinized Natural Rubber and Its Effect on the Properties of Natural Rubber/Silica Composites

et al. 2022

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This work aims to enhance the polarity of natural rubber by grafting copolymers onto deproteinized natural rubber (DPNR) to improve its compatibility with silica. Poly(acrylic acid-co-acrylamide)-grafted DPNR ((PAA-co-PAM)-DPNR) was successfully prepared by graft copolymerization with acrylic acid and acrylamide in the latex stage, as confirmed by FTIR. The optimum conditions to obtain the highest conversion, grafting efficiency, and grafting percentage were a reaction time of 360 min, a reaction temperature of 50 °C, and an initiator concentration of 1.0 phr. The monomer conversion, grafting efficiency, and grafting percentage were 91.9–94.1, 20.8–38.9, and 2.1–9.9%, respectively, depending on the monomer content. It was shown that the polarity of the natural rubber increased after grafting. The (PAA-co-PAM)-DPNR was then mixed with silica to prepare DPNR/silica composites. The presence of the (PAA-co-PAM)-DPNR and silica in the composites was found to improve the mechanical properties of the DPNR. The incorporation of 10 phr of silica into the (PAA-co-PAM)-DPNR with 10 phr monomer increased its tensile strength by 1.55 times when compared to 10 phr of silica loaded into the DPNR. The silica-filled (PAA-co-PAM)-DPNR provided s higher storage modulus, higher Tg, and a lower tan δ peak, indicating stronger modified DPNR/silica interactions and greater thermal stability when compared to silica-filled DPNR.

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“…Besides, it shows phase transition temperature (LCST) at around 31°C which is close to body temperature (Hermann et al, 2014). Nevertheless, its mechanical strength is inadequate, and thereby crucial efforts have been devoted to improve its mechanical properties (Nuntahirun et al, 2017). NIPAM has been copolymerized and graft copolymerized with many polymers, such as cellulose nanowhiskers (Hebeish et al, 2014), Styrene-Butadiene Rubber (Hermann et al, 2014;Kangwansupamonkon et al, 2005), chitosan derivative (Ifuku et al, 2013), poly(N-vinylpyrrolidone) (Jin et al, 2008), Poly(ethylene oxide) (Qin et al, 2006), ethyl cellulose (Kang et al, 2013), glutaraldehyde (GTA) cross-linked hyaluronic acid (HA), and Deproteinized natural rubber (Zhao et al, 2023).…”

Section: Introductionmentioning

confidence: 99%

Multifunctional ENR-g-PNIPAM/PPy/cotton fabric composites for hexavalent chromium removal

Ding,

Yang,

Wang

et al. 2024

Cellulose

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Epoxidized natural rubber (ENR) grafted Poly(N-isopropylacrylamide) (ENR-g-PNIPAM) hydrogel was exploited by classic free radical polymerization, which exhibited practical potential for temperaturesensitive material. Free ENR was introduced in the ENR-g-PNIPAM hydrogel to construct a secondary network that will form chain entanglement and further improve the chemical and physical properties of the hydrogel. The renewable ENR and a facile fabrication process make large-scale production of the ENR-g-PNIPAM hydrogel possible and prompt its commercial value. The content of ENR was systematically varied and studied to ensure optimal ratio. Among various compositions examined, the 7:3 weight ratio of ENR/NIPAM in the hydrogel(70ENR) exhibited excellent properties. Additionally, a simple scheme was also designed for fabricating a multifunctional ENR-g-PNIPAM/polypyrrole/cotton (EPPC) composites with simultaneous adsorption of Cr (VI) and electrothermal conversion. The EPPC composites demonstrated good adsorption capacity with 127 mg/g at pH = 2 in an aqueous solution containing 100mg/L Cr (VI), while also functioning as a thermistor with enhanced sensitivity. The adsorption data can be better described by the pseudo-second-order kinetic model and the Freundlich isotherm model, indicating that the adsorption was a chemical and multilayer. Bene ting from these research results, enabling the synthesized hydrogel a crucial role in terms of Cr (VI) treatment and thermal sensor.

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Temperature-responsive N-isopropylacrylamide-grafted natural rubber

Cited by 7 publications

References 47 publications

Preparation of Crosslinked Poly(acrylic acid-co-acrylamide)-Grafted Deproteinized Natural Rubber/Silica Composites as Coating Materials for Controlled Release of Fertilizer

Preparation of Crosslinked Poly(acrylic acid-co-acrylamide)-Grafted Deproteinized Natural Rubber/Silica Composites as Coating Materials for Controlled Release of Fertilizer

Preparation of Poly(acrylic acid-co-acrylamide)-Grafted Deproteinized Natural Rubber and Its Effect on the Properties of Natural Rubber/Silica Composites

Multifunctional ENR-g-PNIPAM/PPy/cotton fabric composites for hexavalent chromium removal

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