Mechanical properties and soiling resistance of paper with polyurethane coating reinforced with cellulose nanomaterials

Goo, Sooim; Yook, Simyub; Park, Shin Young; Im, Wanhee; Youn, Hye Jung

doi:10.15376/biores.14.4.8973-8986

Cited by 3 publications

(1 citation statement)

References 33 publications

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“…To solve the above problems, modified nanocellulose can be combined with polyurethane. Studies have shown that when modified nanocellulose is used as a filler and the structure of the grafted chain is the same as that of polyurethane, a continuous interface can be directly formed between nanocellulose and polyurethane, and the interfacial binding force between the two can be greatly enhanced [5]. Especially when the grafted molecular weight is large enough, there is entanglement between the grafted chain and the un-grafted chain, which can further enhance the interfacial binding force between nanocellulose and polyurethane.…”

Section: Introductionmentioning

confidence: 99%

Preparation of shape memory polyurethane composite materials by grafting PCL onto CNFs with different carboxyl content

Liu,

Basta,

Liu

et al. 2023

Preprint

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This paper presented the preparation of cellulose nanofiber (CNFs) with different amount of carboxyl groups from rice straw pulp using TEMPO/NaBr/NaClO oxidation system. It is found that the obtained CNFs were in nano fibers with an average diameter of 6 nm and an average length of 160 nm. Subsequently, the CNFs were grafted with polycaprolactone (PCL) to form the grafted product CNFs-g-PCL, which was blended with shape memory polyurethane (SMPU) to obtain CNFs-g-PCL/SMPU composites. The graft ratio of PCL on CNFs decreased from 24.6–10.7% as the carboxyl content in CNFs increased 0.35mmol/g to 1.14mmol/g. So the hydrophobicity of the grafted product (CNFs-g-PCL) also decreases as the carboxyl content increases in CNFs. When the addition of CNFs-g-PCL was 10%, the elastic modulus (up to 54.4%) and tensile stress (up to 67.3%) of the CNFs-g-PCL / SMPU composite were both higher than those of the pure SMPU. In addition, the shape retention and shape recovery rates of the composite did not significantly change after the addition of CNFs-g-PCL. Therefore, the addition of CNFs-g-PCL can improve the mechanical properties of SMPU while maintaining its shape memory properties.

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Section: Introductionmentioning

confidence: 99%

Preparation of shape memory polyurethane composite materials by grafting PCL onto CNFs with different carboxyl content

Liu,

Basta,

Liu

et al. 2023

Preprint

View full text Add to dashboard Cite

show abstract

Preparation of shape memory polyurethane composite materials by grafting PCL onto CNFs with different carboxyl content

Liu,

Basta,

Liu

et al. 2024

Discov Appl Sci

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This study describes the preparation of cellulose nanofibers (CNFs) with varying amounts of carboxyl groups from rice straw pulp using the TEMPO/NaBr/NaClO oxidation system. The resulting CNFs were found to be in the form of nanofibers with an average diameter of 6 nm and an average length of 160 nm. To further enhance their properties, the CNFs were grafted with polycaprolactone (PCL) to create CNFs-g-PCL, which was then blended with shape memory polyurethane (SMPU) to produce CNFs-g-PCL/SMPU composites. It was observed that as the carboxyl content in CNFs increased from 0.35 to 1.14 mmol/g, the graft ratio of PCL on CNFs decreased from 24.6 to 10.7%. Consequently, the hydrophobicity of the grafted product (CNFs-g-PCL) also decreased. When 10% CNFs-g-PCL was added to the SMPU matrix, the elastic modulus and tensile stress of the resulting composite were both higher than those of the pure SMPU, increasing by up to 54.4% and 67.3%, respectively. Additionally, the shape retention and shape recovery rates of the composite remained stable after addition of CNFs-g-PCL. In conclusion, incorporating CNFs-g-PCL into SMPU can improve its mechanical properties while maintaining its shape memory properties. Graphical abstract

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Bamboo charcoal fused with polyurethane foam for efficiently removing organic solvents from wastewater: experimental and simulation

Wang

Zhao

et al. 2022

Biochar

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The development of a multifunctional oil adsorbing material which could effectively and quickly separate oily wastewater is one of the focuses in water environment restoration. In this study, bamboo charcoal (BC) was used as an improver to modify polyurethane (PU) foam. The results of scanning electron microscope (SEM) and Fourier-transform infrared spectroscopy (FTIR) revealed that the addition of BC could effectively improve the mechanical properties of PU. The adsorption data exhibited that the BC-loaded PU (BC/PU) foam composites effectively removed seven organic solvents (OSs, including octane, petroleum ether, soybean oil, chlorobenzene, 1,2-dichloroethane, n-hexane, cyclohexane), and the maximum adsorption capacity of BC/PU was 23.6 g g−1 when BC content was 5%. The order of pseudo-second-order kinetic constants and maximum adsorption capacity of seven OSs was octane < petroleum ether < soybean oil < chlorobenzene < 1, 2-dichloroethane < cyclohexane < n-hexane. Based on the experimental data and density functional theory (DFT) simulation, the adsorption mechanism of OSs on BC/PU-5 was discussed. The EHOMO and μ of OSs calculated by DFT were highly correlated with absorption affinity (K2, Qe and Qmax). Hence, the contribution of OSs to the adsorption efficiency of BC/PU-5 may be mainly due to electron donor–acceptor (EDA) interaction and non-hydrophobic interaction. In addition, the adsorption capacity did not change significantly after repeated recycling 5 times. Overall, the prepared BC/PU foam composites could be used as a potential candidate for separating OSs in engineering applications. Graphical Abstract

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Mechanical properties and soiling resistance of paper with polyurethane coating reinforced with cellulose nanomaterials

Cited by 3 publications

References 33 publications

Preparation of shape memory polyurethane composite materials by grafting PCL onto CNFs with different carboxyl content

Preparation of shape memory polyurethane composite materials by grafting PCL onto CNFs with different carboxyl content

Preparation of shape memory polyurethane composite materials by grafting PCL onto CNFs with different carboxyl content

Bamboo charcoal fused with polyurethane foam for efficiently removing organic solvents from wastewater: experimental and simulation

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