Eco-friendly process for facile pore control in thermally stable cellulose acetate utilizing zinc(II) nitrate for water-treatment

Lee, Woong Gi; Kang, Sang Wook

doi:10.1016/j.jiec.2019.08.056

Cited by 15 publications

(5 citation statements)

References 21 publications

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“…The average pore diameter and porosity were 300 nm and 69.7%, smaller than those in the previous studies, which use glycerin as an additive. The comparison results are shown in the following Table 2 [28]. Thus, the proposed nanoporous polymer membranes are more flexible and compact than those in the previous study.…”

Section: Discussionmentioning

confidence: 81%

“…In recent studies, our group have enhanced porous films through an efficient pore-generation method with small-molecular-weight organic additives and water pressure based on a cellulose acetate (CA) polymer, which is cheap, thermally stable, and environmentally friendly [24][25][26]. Our group proposed a method for the generation of pores by using metal salts, such as magnesium nitrate, nickel (II) nitrate, and zinc (II) nitrate, as additives [27,28]. This method has been used to form pores applying a water-pressure treatment on the portion where hydrated metal ion and nitrate ion are present in the CA film because nitrate ion has good hydration effect.…”

Section: Introductionmentioning

confidence: 99%

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Formation of Water-Channel by Propylene Glycol into Polymer for Porous Materials

2021

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In this study, a porous membrane with a cellulose acetate (CA) matrix was fabricated using propylene glycol with a water pressure treatment without a metal salt as an additive. The water pressure treatment of the fabricated CA membrane with propylene glycol yielded nanopores. The nanopores were formed as the additives in the CA chains led to plasticization. The weakened chains of the parts where the plasticization occurred were broken by the water pressure, which generated the pores. Compared to the previous study with glycerin as an additive, the size of the hydration region was controlled by the number of hydrophilic functional groups. When water pressure was applied to the CA membrane containing propylene glycol as an additive, the hydration area was small, so it was effective to control the pore size and the number of nano pores than glycerin. In addition, the number of nanopores and pore size could be easily adjusted by the water pressure. The porosity of the membrane was increased owing to the trace amount of propylene glycol, confirmed by scanning electron microscopy (SEM) and porosimetry. The interaction between the CA and propylene glycol was verified by Fourier-transform infrared spectroscopy (FT-IR) and thermogravimetric analysis (TGA). Consequently, it was the optimum composition to generate pores at the CA/propylene glycol 1:0.2 ratio, and porosity of 69.7% and average pore diameter of 300 nm was confirmed. Since it is a membrane with high porosity and nano sized pores, it is expected to be applied in various fields.

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Section: Discussionmentioning

confidence: 81%

Section: Introductionmentioning

confidence: 99%

Formation of Water-Channel by Propylene Glycol into Polymer for Porous Materials

2021

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“…Cellulose acetate (CA), as one of the earliest cellulose derivatives, has been widely used in different applications, including membranes for water treatment, gas separation, and lms for packaging (Assis et al, 2020;Lee & Kang, 2020;Mubashir et al, 2021). According to the material performance requirements and customer orientation for food packaging, the lms commercially applicable mainly depend on their mechanical and optical properties, lipid and water solubility, and functional properties to act as a barrier to water vapors (Assis et al, 2021;Liu et al, 2021;Tedeschi et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Improvement of the functional properties of cellulose acetate film by incorporating with glycerol and n-propanol

Yuan

Dai

et al. 2022

Cellulose

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Cellulose acetate (CA) was used for the preparation of food packaging lm. Glycerol and n-propanol were introduced, as plasticizer and transparent agent, respectively for evaluating the possible changes of the lm functional properties of tensile strength and transparency. The transmittance, haze value, tensile strength and exibility were acquired by using optical and mechanical analyses, respectively. The presence of glycerol improved the functional properties of lms by increasing their extensibility, exibility, and elasticity; however transparency of the lms deteriorated with the inclusion of plasticizer. Therefore, the addition of n-propanol as transparent agent into the lms enhanced the transparency. Moreover, morphological changes and gas barrier property were con rmed by SEM and WVTR analyses. The results suggest that CA lms incorporated with plasticizer and transparent agent have good functional properties in isolating water vapor, mechanical performance and optical properties, demonstrating that the optimal lm has a potential in the application for food packaging.

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“…Our research group has also tried various attempts to improve the performance of the separator. Acetyl cellulose (AC) polymer was selected as the main material for these polymer membranes [26][27][28][29]. Cellulose derivatives refer to products obtained by oxidation, substitution, and other chemical treatment of wood-based materials, and are used as raw materials in various chemical industries depending on the type of functional group to be substituted.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, we conducted a study on pore formation through hydraulic pressure and additives such as wetting agents and metal salts. This method has the advantage that it can be reused in the process if the used water goes through a filter, and the amount and size of pores can be easily adjusted by the number of additives or water pressure [26][27][28][29]. Since metal salts are more expensive than wetting agents, glycerin was used in this study.…”

Section: Introductionmentioning

confidence: 99%

Formation of Nanochannels Using Polypropylene and Acetylcellulose for Stable Separators

2022

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In this study, a polymer separator with enhanced thermal stability is prepared to solve the problem of thermal durability of lithium-ion battery separators. This separator is manufactured by coating a solution of acetyl cellulose and glycerin on polypropylene. The added glycerin reacts with the acetyl cellulose chains, helping the chains become flexible, and promotes the formation of many pores in the acetyl cellulose. To improve the thermal stability of the separator, a mixed solution of acetyl cellulose and glycerin was coated twice on the PP membrane film. Water pressure is applied using a water treatment equipment to partially connect the pores of a small size in each layer and for the interaction between the PP and acetyl cellulose. SEM is used to observe the shape, size, and quantity of pores. TGA and FT-IR are used to observe the interactions. Average water flux data of the separators is 1.42 LMH and the decomposition temperature increases by about 60 °C compared to the neat acetyl cellulose. It is confirmed that there is an interaction with PP between the functional groups of acetyl cellulose.

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Eco-friendly process for facile pore control in thermally stable cellulose acetate utilizing zinc(II) nitrate for water-treatment

Cited by 15 publications

References 21 publications

Formation of Water-Channel by Propylene Glycol into Polymer for Porous Materials

Formation of Water-Channel by Propylene Glycol into Polymer for Porous Materials

Improvement of the functional properties of cellulose acetate film by incorporating with glycerol and n-propanol

Formation of Nanochannels Using Polypropylene and Acetylcellulose for Stable Separators

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