Article
Polymer Science
Hak Yong Lee, Jin Ho Seok, Jae-Chang Lee, Won-ki Lee, Tadahisa Iwata
Summary: In this study, a series of cellulose ester-graft-polylactide copolymers were synthesized using the ionic liquid 1-ethyl-3-methylimidazolium diethylphosphate as the reaction medium. The structures and compositions of the copolymers were controlled by varying the feed ratio of carboxylic anhydride and L-lactide. The copolymers exhibited enhanced thermal stability and thermoplasticity due to the intermolecular interactions. The mechanical properties and biodegradability of the copolymers were investigated using homogeneous cast films and enzymatic degradation.
POLYMER DEGRADATION AND STABILITY
(2023)
Article
Chemistry, Applied
Bin He, Pengbing Chang, Xing Zhu, Sufeng Zhang
Summary: Construction of a biomimetic cellulase-loaded enzymatic film inspired by the sea anemone's predation process can effectively increase the efficiency of insoluble cellulose hydrolysis and enable enzyme recycling. This immobilization system can significantly reduce the cost of cellulose conversion in industrial areas.
CARBOHYDRATE POLYMERS
(2021)
Article
Biochemistry & Molecular Biology
Ozge Akay, Cagatay Altinkok, Gokhan Acik, Huseyin Yuce, Gozde Konuk Ege, Garip Genc
Summary: In this research, a bio-based graft copolymer based on the cellulose of Luffa cylindrica main chain possessing poly(epsilon-caprolactone) pendant groups is synthesized. The results show that the incorporation of PCL groups increases the hydrophobicity of the copolymer and enhances its degradation under enzymatic conditions.
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
(2022)
Article
Materials Science, Paper & Wood
Ruochun Wang, Liduo Rong, Shujing Ni, Qiankun Wang, Bijia Wang, Zhiping Mao, Xueling Feng, Jinying Yuan, Xiaofeng Sui
Summary: A novel approach using horseradish peroxidase (HRP)-mediated polymerization was developed to prepare cellulose acetoacetate-graft-copolymers, demonstrating successful grafting reactions. The method proved to be a powerful tool for obtaining graft copolymers and achieved satisfactory results in exploring the optimal conditions for enzymatic initiation.
Article
Chemistry, Multidisciplinary
B. Kiani-Dehkordi, A. Vatanara, M. Amini, M. Hamidi, M. Dibaei, P. Norouzi, S. Rezaei, A. Khoshnazar, M. R. Rouini
Summary: This article introduces an amphiphilic block copolymer based on hyaluronic acid (HA) and polycaprolactone (PCL), which can be assembled into polymersomes using the solvent substitution strategy. By modifying the polymer system, drugs can be effectively released to targeted sites, providing a passive targeting system for P80 receptors on the blood-brain barrier. By loading celecoxib molecules into the polymer system, the functional capacity of this vehicle is demonstrated. The improved performance includes particle size distribution, encapsulation efficiency, zeta potential, and poly-dispersity index, which are 95%, 120 +/- 10 nm, -21 mV, and <= 0.2, respectively. In addition, this vehicle exhibits 72 hours of sustained drug release in phosphate-buffered saline.
MATERIALS TODAY CHEMISTRY
(2023)
Article
Biochemistry & Molecular Biology
Irisvan S. Ribeiro, Francisco J. G. Pontes, Maria J. M. Carneiro, Nayara A. Sousa, Vicente P. T. Pinto, Fabio O. S. Ribeiro, Durcilene A. Silva, Gisele S. Araujo, Jose D. B. Marinho Filho, Ana J. Araujo, Haroldo C. B. Paula, Judith P. A. Feitosa, Regina C. M. de Paula
Summary: Polymer-based nanoparticles prepared in this study showed excellent drug encapsulation, controlled release performance, and biocompatibility, making them promising for drug delivery applications.
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
(2021)
Article
Polymer Science
Jin Ho Seok, Yukiko Enomoto, Tadahisa Iwata
Summary: Paramylon ester-graft-poly(lactic acid) copolymers were synthesized and their thermal and enzymatic degradation properties were investigated. The copolymers could be degraded in a two-step enzymatic treatment, and the degradation level depended on the degree of substitution of the paramylon ester backbone. Among them, PaAc1.0-g-PLA was a plastic material with thermoplasticity and complete biodegradability.
POLYMER DEGRADATION AND STABILITY
(2022)
Article
Polymer Science
Xing Li, Wenqing Xu, Xiaohua Chang, Ying Zheng, Lingling Ni, Guorong Shan, Yongzhong Bao, Pengju Pan
Summary: This study reports on the controlled synthesis, stepwise crystallization kinetics, and crystallization-induced microphase separation and structural evolution of a novel end-functionalized supramolecular polymer PCL-Thy. The double-crystalline nature of PCL-Thy was observed, with thymine units and PCL blocks crystallizing and melting in a sequential manner. This work provides important insights into crystallization-induced microphase separation and hierarchical ordering in double-crystalline supramolecular polymers.
Article
Polymer Science
Jin Ho Seok, Yukiko Enomoto, Tadahisa Iwata
Summary: PaPr-g-PLA and PaPr-g-PCL were synthesized by grafting on paramylon propionate, and subsequent acetylation of the grafted side-chains significantly improved the thermal stability of the copolymers. The mechanical properties of the acetylated copolymer films were investigated and discussed.
Article
Chemistry, Multidisciplinary
Jiali Chen, Xiaoqin Si, Yubao Wang, Zhiwen Ren, Qian Liu, Fang Lu
Summary: Efficient fractionation and utilization of biomass remains a challenge due to its recalcitrance. This study presents a simple and efficient approach to obtain high-purity cellulose using ε-caprolactone and water, achieving a delignification degree of 97.5%. FTIR spectroscopy reveals the synergistic removal of lignin and clear macrofibrils in the cellulose. The mixed solvent shows good performance for lignin removal from various agricultural and forestry wastes, and complete transformation of biomass constituents is achieved with a Ni-Al catalyst.
Article
Biotechnology & Applied Microbiology
Jung Ki Hong, Shelley L. Cooke, Abby R. Whittington, Maren Roman
Summary: The study found that surface-oxidized cellulose nanocrystals (SO-CNCs) can act as multi-functional scaffold additives by improving the mechanical properties of PCL and inducing biomineral formation upon PCL resorption. In vitro experiments showed that SO-CNCs were more effective at inducing mineral formation than sulfuric acid-hydrolyzed CNCs (SH-CNCs).
FRONTIERS IN BIOENGINEERING AND BIOTECHNOLOGY
(2021)
Article
Chemistry, Applied
Aoi Nakashima, Kaho Kohori, Kazuya Yamamoto, Jun-ichi Kadokawa
Summary: Chitin hexanoate-graft-poly(epsilon-caprolactone) (ChHex-g-PCL) was found to be thermoplastic, and the thermoplasticity was confirmed by the formation of a melt-pressed film. Chitin hexanoates were prepared by hexanoylation of chitin and then the surface-initiated ring-opening graft polymerization of epsilon-caprolactone was conducted to graft PCL chains onto the hydroxy groups of chitin hexanoates. The molar substitution and degree of polymerization of the PCL graft chains were influenced by the catalyst, reaction time, and degree of substitution.
CARBOHYDRATE POLYMERS
(2022)
Article
Engineering, Manufacturing
Angelica Avella, Alexander Idstrom, Rosica Mincheva, Koyuru Nakayama, Lars Evenas, Jean-Marie Raquez, Giada Lo Re
Summary: This study proposes a design for peroxide-initiated crosslinking of biodegradable poly(epsilon-caprolactone) and renewable cellulose nanocrystals to replace non-biodegradable plastics. By utilizing a water-assisted reactive melt-processing method, targeted thermoplastic/thermoset bionanocomposites with improved properties and melt performance are achieved. The incorporation of cellulose nanocrystals in a percolating network enhances the crosslinked bionanocomposites' properties, while also providing heat-shrinkability and potential heat-triggered shape-memory.
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
(2022)
Article
Biochemistry & Molecular Biology
Jia Li, Defeng Wu
Summary: Using polysaccharide nanocrystals as fillers in biodegradable polyesters can create completely biodegradable nanocomposites. The study found that chitin nanocrystals and cellulose nanocrystals have completely different effects on the crystallization of poly(epsilon-capro-lactone) (PCL). Chitin nanocrystals retard the nucleation and overall crystallization process of PCL, while cellulose nanocrystals promote nucleation and accelerate crystal growth.
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
(2022)
Article
Chemistry, Analytical
Tugba Celiker, Faezeh Ghorbanizamani, Hichem Moulahoum, Emine Guler Celik, Kerem Tok, Figen Zihnioglu, Candan Cicek, Ruchan Sertoz, Bilgin Arda, Tuncay Goksel, Kutsal Turhan, Suna Timur, Yusuf Yagci
Summary: A rapid and easy immunofluorescence bioassay for SARS-CoV-2 detection was developed using a one-pot synthetic approach for the production of a graft fluorescent copolymer PPy-g-PCL. The assay showed a detection range of 6.03-8.7 LOG viral copy mL(-1) and a high correlation with RT-PCR data. This study provides new insights for simplified synthesis procedures of reporter molecules and their potential applications in sensing and diagnosis.
Article
Chemistry, Applied
Madhusudhan Alle, Soo Chan Park, Rajkumar Bandi, Seung-Hwan Lee, Jin- Chul Kim
Summary: A novel microwave-assisted green in-situ synthesis of positively charged gold nanoparticles supported by cationic cellulose nanofibrils within 30 s is reported. The peroxidase activity of these positive AuNPs was found to be superior over its negative charged counterpart. The film made from AuNPs@C.CNF can be reused for the detection of glucose up to five cycles without a decrease in activity, with comparable results to the standard GOD-POD method for quantifying glucose in human serum samples.
CARBOHYDRATE POLYMERS
(2021)
Article
Chemistry, Applied
Madhusudhan Alle, Rajkumar Bandi, Garima Sharma, Seung-Hwan Lee, Jin-Chul Kim
Summary: An environmentally friendly method for the formation of gold nanoparticles on cellulose nanofibrils is reported, with quick synthesis, excellent catalytic activity, and easy recovery and reuse.
CARBOHYDRATE POLYMERS
(2021)
Article
Forestry
Yujie Meng, Cristian I. Contescu, Peizhi Liu, Siqun Wang, Seung-Hwan Lee, Junjie Guo, Timothy M. Young
Summary: An electron microscopy investigation was performed to understand the relationship between the microstructure and properties of carbonized cellulose and lignin, revealing structural differences that explain the higher surface area and porosity of carbonized cellulose. Additionally, the presence of certain well-ordered carbon in carbonized lignin indicates potential for obtaining acceptable moduli of carbon fiber from lignin with appropriate modifications. This research contributes to an improved understanding of the carbonization mechanism of cellulose and lignin components in biomass materials.
WOOD SCIENCE AND TECHNOLOGY
(2021)
Article
Materials Science, Paper & Wood
Waki Ikegami, Hiroshi Kamitakahara, Yoshikuni Teramoto, Toshiyuki Takano
Summary: Cellulose, comprising D-glucose and L-glucose, was synthesized via cationic ring-opening polymerization, with the deprotection and acetylation steps resulting in optically inactive cellulose triacetate. The synthesis marks the first reported instance of optically inactive D,L-cellulose, achieved through a method involving compounds 1D and 1L.
Article
Materials Science, Paper & Wood
Arindam Chakrabarty, Yoshikuni Teramoto
Summary: Research has shown that preparing cellulose gelators (CLGs) by grafting poly(ethylene glycol)-based amphiphile (PGLE) onto cellulose nanofibers (CNFs) can stabilize oil-in-water emulsions with high oil volume. The stability and oil droplet sizes of CLGs depend on the degree of PGLE substitution, CLG concentration, and volume of aqueous phase.
Article
Polymer Science
Marwanto Marwanto, Muhammad Iqbal Maulana, Fauzi Febrianto, Nyoman Jaya Wistara, Siti Nikmatin, Nanang Masruchin, Lukmanul Hakim Zaini, Seung-Hwan Lee, Nam-Hun Kim
Summary: The study found that CNCs produced from balsa and kapok fibers after 8-16 hours of APS oxidation had satisfactory zeta potential values and thermal stabilities. With longer oxidation times, CNC dimensions decreased, surface charge of balsa and kapok CNCs increased, and CNCs with higher thermal stability were associated with longer oxidation times.
Article
Polymer Science
Ji-Soo Park, Chan-Woo Park, Song-Yi Han, Eun-Ah Lee, Azelia Wulan Cindradewi, Jeong-Ki Kim, Gu-Joong Kwon, Young-Ho Seo, Won-Jae Yoo, Jaegyoung Gwon, Seung-Hwan Lee
Summary: The mechanical properties of alginate fibers were improved by reinforcing with various cellulose nanofibrils. Tensile strength and elastic modulus increased with CNF content up to 10%, but deteriorated with 30% CNF addition. The order of tensile properties was LCNF/AL > PCNF/AL > TOLCNF/AL > AL, and an increase in spinning rate improved the properties.
Article
Polymer Science
Chan-Woo Park, Song-Yi Han, Rajkumar Bandi, Ramakrishna Dadigala, Eun-Ah Lee, Jeong-Ki Kim, Azelia Wulan Cindradewi, Gu-Joong Kwon, Seung-Hwan Lee
Summary: The study investigated the effect of lignin esterification with fatty acid chloride on the properties of lignin and lignin/PLA composites. It was found that esterified lignin/PLA composites exhibited cleaner and smoother morphological characteristics, higher tensile strength, and elastic modulus compared to non-esterified composites. Esterification also reduced water absorption and improved the compatibility of lignin and PLA.
Review
Materials Science, Composites
Yoshikuni Teramoto
Summary: Adding acid-modified resin compatibilizers is crucial for enhancing plastic composites with carbon-neutral cellulosic fillers. Researchers have studied the effectiveness of compatibilizers from a mechanical perspective, but further investigation is needed on a microscopic level to understand the mechanism and optimize parameters for structural analysis.
JOURNAL OF COMPOSITES SCIENCE
(2021)
Article
Polymer Science
Kazuma Miyagi, Toshiyuki Takano, Yoshikuni Teramoto
Summary: This study developed a simple glucose sensing method without the use of enzymes. Aqueous solutions prepared by dissolving PBA-HPC formed a liquid crystal and exhibited structural color, which changed in response to the increase in glucose concentration.
JOURNAL OF APPLIED POLYMER SCIENCE
(2022)
Article
Forestry
Seong-Hyun Kim, Byantara Darsan Purusatama, Jong-Ho Kim, Seung-Hwan Lee, Nam-Hun Kim
Summary: This study comparatively studied the bending properties of Dahurian and Japanese larch grown in Korea, and found that Dahurian larch showed better properties than Japanese larch. The properties varied between heartwood and sapwood as well as tangential and radial directions. The bending properties were positively correlated with latewood percentage, air-dry density, and negatively correlated with growth ring width.
Article
Forestry
Jong-Ho Kim, Byantara Darsan Purusatama, Alvin Muhammad Savero, Denni Prasetia, Go-Un Yang, Song-Yi Han, Seung-Hwan Lee, Nam-Hun Kim
Summary: This study aims to verify the performance of CNNs in classifying wood and investigate the factors affecting classification accuracy. The dataset consisted of cross-sectional micrographs from different parts of 10 softwood species. The results showed that all four architectures achieved high classification accuracy of over 90% between species, and the accuracy increased with increasing epochs.
Article
Materials Science, Paper & Wood
Satoshi Aruga, Yoshikuni Teramoto, Toshimitsu Hata, Toshiyuki Takano
Summary: Solid dispersion materials of abietic acid (ABA) were prepared using different nanofibers (CNF, TOCNF, ChNF) and their interactions and ABA release behavior varied.
Article
Materials Science, Paper & Wood
Satoshi Aruga, Kenji Takagi, Yoshikuni Teramoto, Toshiyuki Takano
Summary: The dynamic adsorption and desorption behaviors of rosin colloids onto and from CNFs and TOCNFs in aqueous media were investigated using QCM-D measurements. The effects of maleic anhydride modification, anionic surfactant, and Alum addition on the adsorption were studied. The results showed that maleic anhydride modification contributed to particle size reduction, an increase in Tg, and enhanced stability, while using an anionic surfactant increased the particle size and ionicity. The adsorption of rosin colloids was affected by the surface charge of CNFs and the presence of Alum.
Article
Green & Sustainable Science & Technology
Yoshikuni Teramoto, Takumi Ito, Chihiro Yamamoto, Toshiyuki Takano, Hironari Ohki
Summary: This study uses mid-infrared spectroscopy and machine learning to detect inapparent deterioration in waterborne acrylic wood coatings containing cellulose nanofibers. The results demonstrate the potential of machine learning in identifying subtle changes in coatings and facilitating cost-efficient and environmentally sustainable maintenance strategies for wood surfaces.
ADVANCED SUSTAINABLE SYSTEMS
(2023)