A new route to polymeric materials derived from chitosan and natural rubber

Venkatanarasimhan, Swarnalatha; Dhamodharan, R.

doi:10.1007/s00289-015-1403-7

Cited by 8 publications

(3 citation statements)

References 36 publications

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“…As shown in Figure , the C–H bending vibration peak of methyl or the amide III band of CS near 1368 cm –1 changes from a single peak to a double peak in the supramolecular polymer spectrum with the introduction of CS and PVA, indicating that the characteristic peaks of both the methyl absorption peak related to ENR and the amide III band related to CS are presented in the composite. Moreover, the double peak is most obvious in the spectra of supramolecular polymers with 10 wt % CS and 30 wt % PVA, and the continued increase in the CS and PVA contents changes the double peak back to a single peak.…”

Section: Resultsmentioning

confidence: 95%

Green Slow-Release Coated Nitrogen Fertilizer with High Water Retention Based on Core–Shell-Structured Self-Healing Supramolecular Networks

Zhang,

Yuan

et al. 2024

ACS Sustainable Chem. Eng.

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Rubber can improve the mechanical properties of the coated nitrogen fertilizers (CNFs), but the biomass components cause holes in the urea release process, thus accelerating the release of urea. In this study, a self-healing rubber (SHR) shell/hydrogel core based on a supramolecular network was fabricated as a coating material for CNFs to improve the above problems. The core of CNFs consists of vanillin(Van)-cross-linked poly(vinyl alcohol) (PVA)/carboxymethyl chitosan (CMCS) hydrogel, prepared by a freeze−thaw cycle. The shell of CNFs was prepared by soaking Van-cross-linked natural rubber (NR)/chitosan (CS)/PVA material in Zn 2+ solution. A green core− shell structured CNF with hydrogen bonding and metal coordination was finally prepared, which has improved the mechanical properties, slow-release effect, and soil water retention capacity of the CNF. The effects of CS and PVA contents and the impregnation of Zn 2+ on the physical and chemical properties of the SHR supramolecular composite and its self-healing ability were investigated, and the urea release kinetics were analyzed. The CNFs could reach release equilibrium in water for 10 days, with a slow-release rate of 62.7%, and the urea release kinetics were in accordance with the Korsmeyer−Peppas model (R 2 ≥ 0.90), with a possible release mechanism of Fickian diffusion.

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Section: Resultsmentioning

confidence: 95%

Green Slow-Release Coated Nitrogen Fertilizer with High Water Retention Based on Core–Shell-Structured Self-Healing Supramolecular Networks

Zhang,

Yuan

et al. 2024

ACS Sustainable Chem. Eng.

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“…3. The composites had one-step degradation process which occurred within 385 ᵒC [14]. It showed that CS slightly effected on thermal stability of the composites when compare to NR with no filler.…”

Section: Resultsmentioning

confidence: 98%

Degradation Test of Natural Rubber/Chitosan Composite

Sukthaworn

Reowdecha

Dittanet

et al. 2017

KEM

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Degradable materials from 20wt% chitosan loading and natural rubber (CS/NR) were prepared by solution casting without surface treatment to study their thermal and mechanical properties after degradation test in aging condition. The test was done in an acrylic degradation box with 600 W light and high humidity for accelerate degradation condition. Samples included high ammonia concentrated latex (HA) with no filler, fresh latex (FL) with no filler, HA with chitosan filler, FL with chitosan filler, and natural rubber with shrimp shell filler to compare the result with chitosan filler. After degradation test, thermal properties from TGA both before and after degradation showed that the fillers effected on these composite materials. TGA result of CS/NR composite with aging at temperature 100 °C for 10 h and 20 h showed that chitosan slightly effected on thermal stability of composites when compare to natural rubber. SEM images were compared before and after degradation of HA and FL with no filler, chitosan filler, and shrimp shell. It was clearly seen that the samples degraded as the shape and size were changed. Tensile testing values showed that longer aging time could lead to the degradation in CS/HA and lower the tensile strength.

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“…3,4 In certain composite applications, bio-based resins have been shown to be competitive to synthetic polymers. 5,6…”

Section: Introductionmentioning

confidence: 99%

Curing and thermal comparative study of rosin epoxy thermosets with bio-based imidoamines and commercial curing agents

Thakur

Gaur

2022

Journal of Elastomers & Plastics

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This paper includes the curing of previously synthesized multifunctional bio-based epoxy resins (PEMPAE/TMPAE) with rosin-based imidoamine curing agents (IAMDK/IASDK/IAEDK) which are nucleophilic addition reaction products of diamino diphenyl ether (DDE) and dimaleopimaryl ketone (DMPK), a dehydrodecarboxylated derivative of MPA. Curing dynamics of rosin-based epoxy resins (PEMPAE/TMPAE) with rosin-based imidoamine curing agents (IAMDK/IASDK/IAEDK) were evaluated using differential scanning calorimetry. For comparison, the bio-based epoxy resins were also cured with rosin derivative dimaleopimaryl ketone (DMPK) and commercial-based diamino diphenyl ether (DDE). The universal testing machine and thermogravimetric analyzer) were used to measure the mechanical properties and thermal stability of the cured epoxy samples. The samples’ chemical resistance was assessed by calculating the weight loss in percent after they were submerged in solutions of NaOH, HCl, and NaCl. We also used scanning electron microscopy (SEM) to examine the morphological changes. Rosin-based epoxy cured with imidoamine curing agents outperformed the commercial epoxy in terms of performance.

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A new route to polymeric materials derived from chitosan and natural rubber

Cited by 8 publications

References 36 publications

Green Slow-Release Coated Nitrogen Fertilizer with High Water Retention Based on Core–Shell-Structured Self-Healing Supramolecular Networks

Green Slow-Release Coated Nitrogen Fertilizer with High Water Retention Based on Core–Shell-Structured Self-Healing Supramolecular Networks

Degradation Test of Natural Rubber/Chitosan Composite

Curing and thermal comparative study of rosin epoxy thermosets with bio-based imidoamines and commercial curing agents

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