Anomalous dichroism of cellulose nanowhisker embedded composite film

Lee, Hyun Kyung; Song, Young Seok

doi:10.1016/j.compositesb.2018.10.088

Cited by 6 publications

(2 citation statements)

References 34 publications

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“…For the purpose of quantitatively estimating the effect of the elongational flow intensity on the orientation of PE-SPCs, the azimuthal scans (0–180°) of the (110) lattice plane in the 2D WAXD patterns were collected and are shown in Figure . Accordingly, the orientation parameter can be calculated using Herman’s orientation parameter as follows where f is the Herman’s orientation parameter, ϕ is the azimuthal angle varies from 0 to180°, and I (ϕ) is the intensity at the corresponding azimuthal angle. Accordingly, the Herman’s orientation parameters of the reference PE sample, R40, R60, and R80 are 0, 0.05, 0.09, and 0.13, respectively, which confirm the elongational flow-induced orientation effect.…”

Section: Resultsmentioning

confidence: 99%

Polyethylene-Based Single Polymer Composites Prepared under Elongational Flow for High-Voltage Applications

Huang

Zhao

2020

Ind. Eng. Chem. Res.

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Recently, polyethylene (PE)-based single polymer composites (SPCs) have been found to be potential candidates for high-voltage applications (HVAs) due to their ability to form supramolecular structures and their recyclabilities. However, a deeper understanding of the controls and evolutions of such a structure is still needed. Herein, by introducing elongational flow into the melt compounding, we could successfully control the structure of polymeric materials and prepared PE-SPCs with additive-level ultrahigh-molecular-weight polyethylene (UHMWPE) for HVAs. The elongational flow-induced multiscale multilevel structure was confirmed and analyzed through X-ray diffraction. Specifically, under elongational flow, we fabricated PE-SPCs with the shish-kebab structure and 2D variated crystal units. The melting behaviors of each sample were studied, and the results indicated an elongational flow-induced cocrystallization phenomenon of low-density polyethylene and UHMWPE during melt processing. Benefiting from the as-formed structure, we obtained PE-SPCs with enhanced mechanical properties and more HVA-adaptable dielectric properties. Particularly, the yield strength, tensile strength, and Young’s modulus of PE-SPC (sample R80) show 42, 23, and 29% enhancement than the virgin PE, respectively. The dielectric constant and dielectric loss of our PE-SPC are determined to be around 2.94 and 2 × 10–4 at 1000 Hz, respectively. Moreover, 10-fold decreases in conductivites in both AC and DC of our PE-SPC are achieved after melt compounding under elongational flow. In conclusion, this work gives a comprehensive understanding of the PE-SPCs’ structure evolution under elongational flow, and the structure–property relationship was also determined. It is believed that this work can promote the development of SPCs for HVAs.

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Section: Resultsmentioning

confidence: 99%

Polyethylene-Based Single Polymer Composites Prepared under Elongational Flow for High-Voltage Applications

Huang

Zhao

2020

Ind. Eng. Chem. Res.

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“…After that, it was vacuum-filtered and dried in a vacuum oven at 60 • C for 4 h. Chitosan, purchased from Sigma-Aldrich, was dissolved in a 1 wt% acetic acid at 40 • C for 2 h. The prepared CNWs and CNTs were dispersed in the chitosan solution under sonication. The solution was cast on a petri dish and dried at 70 • C for 7 h. The CNW and CNT embedded carbonized chitosan films were prepared using the solution-casting method, and their weight percentages were 2 wt% and 10 wt%, respectively [26]. The prepared films were carbonized using a furnace (GTF0850, GSS, Korea) in an argon gas environment.…”

Section: Sample Preparationmentioning

confidence: 99%

Carrier transport of all carbonized β-glucosic eco-materials

Lim¹,

Ahn²,

Song³

2020

Nanotechnology

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Attempts have been made to bring eco-friendly biomaterials into high-end electronic devices that require both high performance and durability. Polysaccharides, glycosidically linked monosaccharide units, are of particular interest because they serve as a promising material, owing to their environmentally friendly and adaptable features. We used a carbonized polysaccharide eco-material encompassing nanoparticles and chitosan to study the carrier-transport behavior of β-glucosic materials. Chitosan composites incorporating nanoparticles were prepared and then carbonized to control the crystal structure of the material. Three kinds of metal-insulator-metal devices were fabricated using carbonized materials, and their carrier-transport properties were analyzed. The results showed that the addition of cellulose nano-whiskers (CNWs) into chitosan leads to a more ordered carbon structure, increasing the charge transport in the carbonized material. We anticipate that carbonizing nanoparticle dispersed green composites provides a new pathway for the development of sustainable and environmentally benign material systems.

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Polyvinyl alcohol based bio‐composite films reinforced by liquefaction products and cellulose nanofibrils from coconut coir

Jun

Wang

Meng

et al. 2021

J of Applied Polymer Sci

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In this study, coconut coir was chemically converted to coir‐polyols (CP) via atmospheric liquefaction under microwave assistance, during which a combination of polyethylene glycol 400 and glycerol, and 98% sulfuric acid were applied as the liquefaction solvents and catalyst, respectively. The obtained CP was then analyzed in terms of its molecular weight distribution, hydroxyl values, and functional groups. Later, CP/polyvinyl alcohol (PVA) bio‐composite films reinforced without and with coir cellulose nanofibrils (CCNF) were prepared. After comprehensive characterization, the CP/PVA films exhibited higher stability in medium‐temperature range, while the CCNF/CP/PVA films on the other hand possessed higher properties of tensile strength, elongation at break, and water resistance. The proper dosage of reinforcing agents for preparing PVA‐based ternary blend films were proposed at 3% of CCNF and 10% of CP (based on film dry weight), which exhibited the best balance of properties in the critical parameters such as tensile strength and elongation at break.

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Anomalous dichroism of cellulose nanowhisker embedded composite film

Cited by 6 publications

References 34 publications

Polyethylene-Based Single Polymer Composites Prepared under Elongational Flow for High-Voltage Applications

Polyethylene-Based Single Polymer Composites Prepared under Elongational Flow for High-Voltage Applications

Carrier transport of all carbonized β-glucosic eco-materials

Polyvinyl alcohol based bio‐composite films reinforced by liquefaction products and cellulose nanofibrils from coconut coir

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