Grafting polycaprolactone diol onto cellulose nanocrystals via click chemistry: Enhancing thermal stability and hydrophobic property

Zhou, Ling; He, Hui; Li, Mei‐Chun; Huang, Siwei; Mei, Changtong; Wu, Qinglin

doi:10.1016/j.carbpol.2018.02.039

Cited by 75 publications

(41 citation statements)

References 42 publications

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“…IR spectra for EPDM-g-MAH is referred [15,25,26]. The absorption bands at the region of 1770 -1792 cm -1 , which attributed to C=O symmetric stretching bonds, were related to successful MAH grafted to the EPDM rubber [27,28,29]. The absorption peak at 922 cm -1 , confirmed the presence of OH group in EPDM-g-MAH.…”

Section: Resultsmentioning

confidence: 99%

On the preparation of EPDM-g-MAH compatibilizer via melt-blending method

Razak

Mohamad

Mahamood

et al. 2019

JMES

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This paper presents an experimental investigation to determine the optimum composition of maleic anhydride (MAH) and dicumyl peroxide (DCP) as initiator for ethylene-propylene-diene-monomer grafted MAH (EPDM-g-MAH) compatibilizer preparation, using response surface methodology (RSM) approach. EPDM-g-MAH was prepared in the laboratory scale by melt blending method using an internal mixer. For this study, the effects of MAH (2.50 – 7.50 wt.%) and DCP (0.10 – 0.30 wt.%) towards grafting efficiency was determined. Two level full factorial design of experiment (DOE) is applied to establish the relationship between these two independent factors of raw materials. Analysis of variance (ANOVA) and the optimization menu were utilized to decide the raw materials formulation with maximum grafting efficiency. Quantitative analysis based on infra-red (IR) spectral intensity supported by 1H-NMR spectral are used to propose for EPDM-g-MAH grafting mechanism. Standard calibration curve for quantity ratio plot was exponential with R2 = 89.19%. It was found that an optimum about 8.52% of MAF grafting efficiency has been yielded with DCP factor has contributed larger effect at 67.45% of contribution effect. Anhydride stretching of grafted C=O as confirmed by FTIR peak at 1713 cm-1 and 1770 – 1792 cm-1 has responsible for MAH grafting into EPDM rubber. Based on FTIR, 1H-NMR and 2D-COSY spectral analysis, reaction mechanism for EPDM-g-MAH grafting was successfully proposed with two possible termination steps.

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Section: Resultsmentioning

confidence: 99%

On the preparation of EPDM-g-MAH compatibilizer via melt-blending method

Razak

Mohamad

Mahamood

et al. 2019

JMES

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“…FTIR revealed the conversion of azide to triazole groups as evidenced by the 57% decrease in peak intensity at 2110 cm −1 for the antisymmetric azide stretching motion [ 29 ]. High-resolution N 1s analysis from XPS also showed that CNC-DES exhibits a single, sharp peak at 401 eV, confirming the conversion of the azide group into a 1H-1,2,3-triazole ring triazole ring [ 30 ]. Further, high-resolution C 1s analysis revealed the appearance of a new peak at 289 eV assigned to carboxylic groups (O–C=O) attributed to the presence of ester groups in DES grafted on CNCs [ 22 ].…”

Section: Resultsmentioning

confidence: 99%

Diethyl sinapate-grafted cellulose nanocrystals as nature-inspired UV filters in cosmetic formulations

Mendoza

Maliha

Raghuwanshi

et al. 2021

Materials Today Bio

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Inspired by nature’s photoprotection mechanisms, we report an effective UV-blocking nanomaterial based on diethyl sinapate-grafted cellulose nanocrystals (CNC-DES). The colloidal stability and UV-blocking performance of CNC-DES in aqueous glycerol (a common humectant in petroleum-free cosmetic formulations) and in a commercially available moisturizing cream were studied. Grafting the water-insoluble DES onto CNCs renders it dispersible in these water-based formulations, thanks to the excellent water-dispersibility of CNC nanoparticles. Glycerol dispersions containing 0.1 to 1.5 wt% CNC-DES display very high UV-blocking activity owing to the anti-UV DES moieties anchored onto CNCs. A facial cream blended with 1.5 wt% CNC-DES exhibits an SPF of 5.03, which is higher than a commercially available sunscreen with the same active ingredient concentration (SPF = 3.84). DPPH radical scavenging assay also showed the antioxidant potential of CNC-DES, albeit coinciding with a significant reduction in antioxidant activity after grafting DES onto CNCs. Cytotoxicity measurements revealed the CNC-DES not to cause significant cytotoxicity to murine fibroblast cells after 24 h of exposure. Overall, CNC-DES exhibits strong anti-UV and antioxidant properties and is water-dispersible, biocompatible, non-greasy, and lightweight. This study demonstrates the exceptional potential of DES-grafted CNCs as nature-inspired UV filters in the next generation of cosmetic formulations, including those for sensitive skins.

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“…Figure 5(a) recorded the test results of polyurethane surface with water, and Figure 5(b) shown the contact angle of polyurethane with an alkaline solution with a different pH range from 10 to 14. It is hydrophobic 22 for Polycaprolactone diol, the trait as aliphatic compounds, and the longer the chain, the easier it is to form a large hydrophobic domain. The water contact angle in Figure 5(a) of PCL-polyurethanes increased accompanied by the raised molecular weight of polycaprolactone diol, and the content of the soft segment also grew.…”

Section: Mechanical Properties and Ph Responsiveness Of Polymersmentioning

confidence: 99%

Synthesis and properties of responsive self-healing polyurethane containing dynamic disulfide bonds

Wang

et al. 2021

High Performance Polymers

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The polymers with pH responsiveness and temperature sensitivity exhibit important applications in many fields. To endow the responsive polymers with self-healing is meaningful work, which contributes to increase their service life and reduce waste of resources significantly. In this research, a series of pH-responsive polyurethanes containing dynamic disulfide bonds and carboxylic acid functional groups were prepared by mixing polycaprolactone diol (PCL), hexamethylene diisocyanate (HDI), 2,2-dimethylolbutyric acid, and bis(2-hydroxyethyl) disulfide. The structure of the polymer was confirmed by some characterization methods such as infrared absorption spectroscopy, Raman scattering spectroscopy, X-ray diffraction, and differential scanning calorimetry. Many performances of the polymer such as the contact angle, thermal stability, mechanics, and self-healing properties can be adjusted by changing the functional units of polyurethanes. The dynamic disulfide bonds in the main chain were observed no harm to the pH response performance, instead which were beneficial to the promotion of heat resistance, tensile properties, and self-healing performance of polyurethane. The elongation at break and the tensile strength are increased by 85.3% and 54.9%, respectively. All the polyurethane exhibited considerable self-healing effects at 110°C, with the highest healing efficiency reaching 93.7%, as a result of the dissociation of hydrogen bonds and the exchange reaction of disulfide bonds.

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Grafting polycaprolactone diol onto cellulose nanocrystals via click chemistry: Enhancing thermal stability and hydrophobic property

Cited by 75 publications

References 42 publications

On the preparation of EPDM-g-MAH compatibilizer via melt-blending method

On the preparation of EPDM-g-MAH compatibilizer via melt-blending method

Diethyl sinapate-grafted cellulose nanocrystals as nature-inspired UV filters in cosmetic formulations

Synthesis and properties of responsive self-healing polyurethane containing dynamic disulfide bonds

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