Article
Chemistry, Applied
Tong Wu, Xueqing Han, Xiaoyu Min, Minfang An, Jingyun Zhao, Wancheng Yu, Liangbin Li
Summary: This study elucidates the roles of crystallization and orientation on the orientation birefringence of cellulose acetate (CA) films, providing valuable guidelines for the production of CA-based optical films with excellent optical performance.
CARBOHYDRATE POLYMERS
(2022)
Article
Chemistry, Applied
Jianyi Du, Javier Paez, Pablo Otero, Pablo B. Sanchez
Summary: It is crucial to monitor the structural evolution of complex fluids, such as in textile spinning, for optimal manufacturing performance. However, measuring these fluids in a textile-spinning process is challenging due to the lack of non-destructive instruments and data interpretation. This study uses a customized polarized microscope to simultaneously measure the kinetic and rheo-optic properties of a cellulose/ionic liquid solution during the wet-spinning process. The results provide key information on the fiber's geometry, structure, and flow dynamics, which are closely related to the mechanical properties of the fully-regenerated fibers and can predict spinning performance without destructive testing.
CARBOHYDRATE POLYMERS
(2023)
Article
Biochemistry & Molecular Biology
Guoqiang Yu, Gehui Liu, Tianyi Liu, Ethan H. Fink, Alan R. Esker
Summary: Changes in mass and viscoelasticity of fungal chitin layers during chitinase attack were studied using regenerated chitin (RChitin) thin films as a mimic. The degradation of RChitin films by family 18 chitinases and family 19 chitinases with chitin-binding domains (CBDs) was monitored in real time. The results showed that chitinase adsorption significantly affected the degradation of RChitin films, and CBDs played an important role in the degradation of insoluble substrates.
Article
Chemistry, Physical
Jose Tiago Carvalho, Ines Cunha, Joao Coelho, Elvira Fortunato, Rodrigo Martins, Luis Pereira
Summary: This study developed one-dimensional fiber-shaped supercapacitors using stretch-broken carbon fiber yarns and in situ regenerated cellulose-based ionic hydrogel. These supercapacitors demonstrated high specific energy density, long-life cycle, and stable current density at different positions. Additionally, an environmentally responsible approach was implemented through the recovery and reuse of active materials, ensuring a circular economy path.
ACS APPLIED ENERGY MATERIALS
(2022)
Article
Materials Science, Paper & Wood
Xiaoyu Min, Xueqing Han, Tong Wu, Minfang An, Liangbin Li
Summary: Propionylated cellulose acetate (PCA) with different propionyl substitution degrees (DSPr) were synthesized and optical films were prepared by solution casting. The study focused on the birefringence and its wavelength dispersion of the PCA films stretched above and below the glass transition temperature (T-g) with different draw ratios (DR). The introduction of propionyl groups at different substitution sites exhibited different contributions to birefringence and its wavelength dispersion.
Article
Materials Science, Multidisciplinary
Tong Wu, Xiaoyu Min, Xueqing Han, Minfang An, Jingyun Zhao, Wancheng Yu, Liangbin Li
Summary: By physically blending rigid-rod-like 4-cyano-4'-pentylbiphenyl (5CB) molecules with cellulose triacetate (CTA), positive orientation birefringence in stretched blend films is significantly increased. Aggregation of 5CB molecules in the stretched blend films, influenced by strong nematic interactions, can further improve orientation birefringence. The diagrams established for pure CTA films and CTA/5CB blend films provide potential guidance for fabrication of CTA retardation films with specific orientation birefringence values.
ACS APPLIED POLYMER MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Hu Tu, Mengxiang Zhu, Bo Duan, Lina Zhang
Summary: Cellulose, as the most abundant sustainable polymer, has the potential to act as an ideal substitute for plastics due to its low cost, wide availability, and biodegradability. Recent achievements in developing cellulose green solvents and regenerated cellulose materials with high strength through bottom-up approaches have shown potential applications in textiles, biomedicine, energy storage, packaging, etc. Importantly, these cellulose-based materials can be biodegraded in soil and oceans, reducing environmental pollution.
ADVANCED MATERIALS
(2021)
Article
Chemistry, Physical
Weizhi Zhu, Jilun Guan, Wenjing Li, Huayang Fang, Mei He, Jianping Sun, Yiqiang Wu, Yanqiu Zhu, Fangchao Cheng
Summary: The dissolution of cellulose allows for a wider range of processing properties and enhances its advantages as a basic material. However, its unsatisfactory mechanical performance and functionality limit its practical application. This study developed a molecular orientation strategy to obtain high-performance cellulose films with improved mechanical and optical properties.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2023)
Article
Polymer Science
Soon Mo Choi, Soo Young Lee, Sunhee Lee, Sung Soo Han, Eun Joo Shin
Summary: The development of waterborne polyurethane (WPU) as an alternative to solvent-based polyurethanes holds promise due to low-VOC alternatives and reduced exposure to solvents. However, low mechanical performance and degradation have hindered their widespread application. In this study, environmentally-friendly bio polyol-based WPU nanocomposite dispersions and films were developed, and optimal process conditions were presented. The use of regenerated cellulose nanoparticles (RCNs) as chain-extenders improved the biodegradability and mechanical performances of the nanocomposite films.
Article
Biochemistry & Molecular Biology
Francisco A. G. Soares Silva, Frank Meister, Fernando Dourado, Miguel Gama
Summary: Due to the global shortage of cotton, the textile industry is searching for sustainable alternatives and developing sustainable recycling processes. The combination of bacterial cellulose (BC) and cellulose filaments with low degree of polymerization (DP) has been found to improve the mechanical properties of the fibers.
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
(2023)
Article
Polymer Science
Tessei Kawano, Satoshi Iikubo, Yoshito Andou
Summary: This study investigated the effects of coagulation conditions on the properties of regenerated cellulose films. The research confirmed that the coagulant species and dielectric constant of solvents strongly influence the mechanical performance and crystal structure of RC films. The findings suggest that controlling the orientation of cellulose crystal regions is crucial in enhancing the mechanical properties of the cellulose film.
Article
Polymer Science
Baku Nagendra, Emanuele Vignola, Christophe Daniel, Paola Rizzo, Gaetano Guerra
Summary: For NC PPO films, c(perpendicular to) orientation in thin films offers increased transparency and guest diffusivity, while different orientation results are observed in thick films. Rapid guest sorption kinetics can prevent co-crystallization, leading to the formation of unoriented structures in thin films. The linear relationship between WAXD crystallinity index and DSC melting enthalpy allows for the evaluation of the melting enthalpy of the NC alpha form of PPO.
Article
Materials Science, Paper & Wood
Feng Xu, Byoung-Uk Cho
Summary: This study successfully fabricated homogeneous and spherical porous regenerated cellulose microstructures (RCMSs) from the agglomeration of micro/nanospheres. The formation mechanism of the RCMSs was investigated by controlling the synthesis time. The re-wetted RCMSs exhibited excellent swelling performance and good physical properties, making them suitable for the design and development of highly functional cellulose-based materials with micro/nanostructures.
Article
Multidisciplinary Sciences
Qing-Fang Guan, Zi-Meng Han, Huai-Bin Yang, Zhang-Chi Ling, Shu-Hong Yu
Summary: Efforts have been made to construct sustainable high-performance structural materials by regenerating isotropic wood from natural wood particles through micro/nanoscale structure design. The regenerated isotropic wood (RGI-wood) exceeds the mechanical limitations of natural wood, showing superior flexural properties, water resistance, and fire retardancy. Mass production of large sized RGI-wood and functional RGI-wood nanocomposites is achievable.
NATIONAL SCIENCE REVIEW
(2021)
Article
Materials Science, Paper & Wood
Kaniz Moriam, Daisuke Sawada, Kaarlo Nieminen, Michael Hummel, Yibo Ma, Marja Rissanen, Herbert Sixta
Summary: The production of sustainable and high-performance fabrics requires high mechanical strength of the individual fibers. By optimizing fiber raw materials and spinning process parameters, high strength and toughness Ioncell fibers can be achieved.
Article
Chemistry, Multidisciplinary
Saurabh Usgaonkar, Subrajeet Deshmukh, Bipul Biswas, Neeta Karjule, Prashant Yadav, Jayaraj Nithyanandhan, Guruswamy Kumaraswamy
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2019)
Article
Physics, Applied
Karthika Suresh, Guruswamy Kumaraswamy
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2019)
Article
Materials Science, Paper & Wood
Aakash Sharma, Shailesh Nagarkar, Shirish Thakre, Guruswamy Kumaraswamy
Article
Polymer Science
Aakash Sharma, Debasis Sen, Shirish Thakre, Guruswamy Kumaraswamy
Correction
Chemistry, Multidisciplinary
Bipul Biswas, Raj Kumar Manna, Abhrajit Laskar, P. B. Sunil Kumar, Ronojoy Adhikari, Guruswamy Kumaraswamy
Article
Polymer Science
Karthika Suresh, Arindam Chowdhury, Sanat K. Kumar, Guruswamy Kumaraswamy
Article
Polymer Science
Nirmalya Bachhar, Guruswamy Kurnaraswamy, Sanat K. Kumar
Article
Physics, Applied
Guruswamy Kumaraswamy, Karthika Suresh, Hisay Lama, Madivala G. Basavaraj, Dillip K. Satapathy
JOURNAL OF APPLIED PHYSICS
(2020)
Article
Materials Science, Multidisciplinary
Aakash Sharma, Margarita Kruteva, Michaela Zamponi, Sascha Ehlert, Dieter Richter, Stephan Forster
Summary: This study reveals that the segmental dynamics of one-component nanocomposites (OCNC) are significantly influenced by the molecular weight of the grafted polymer. The slower segmental dynamics are observed at low molecular weight, while faster dynamics are observed at high molecular weight. By modeling the local relaxation as a distribution of exponential diffusers, the presence of fast and slow segments in OCNC is identified. The fractional contribution of these segments varies with molecular weight, resulting in different average relaxation times.
PHYSICAL REVIEW MATERIALS
(2022)
Article
Chemistry, Physical
Aakash Sharma, Margarita Kruteva, Michaela Zamponi, Sascha Ehlert, Dieter Richter, Stephan Foerster
Summary: The dynamics of pure oleic acid and grafted oleic acid have been studied using quasielastic neutron scattering. It was found that pure oleic acid mainly undergoes translational diffusion at room temperature, while grafted oleic acid in nanocomposites exhibits uniaxial rotation due to grafting and crowding effects. Additionally, grafted oleic acid shows mobility below the crystallization temperature of pure oleic acid. The results suggest potential research on confined surfactant systems using the approach described in this study.
JOURNAL OF CHEMICAL PHYSICS
(2022)
Article
Materials Science, Multidisciplinary
Aakash Sharma, Parnashri Wankhede, Roopali Samant, Shailesh Nagarkar, Shirish Thakre, Guruswamy Kumaraswamy
Summary: Regenerated cellulose fibers, including Lyocell fibers, are important bio-derived commercial fibers produced through environmentally harmful traditional viscose process and more sustainable recent methods. Experimental methods using acid etching, SEM, and SAXS reveal microstructural details, showing heterogeneous water-induced plasticization effects in the amorphous regions. These findings have implications for studying mechanical responses in both dry and wet fibers, and may be applicable to investigations of other polymer fibers.
ACS APPLIED POLYMER MATERIALS
(2021)
Article
Chemistry, Physical
Karthika Suresh, Marleen Haering, Guruswamy Kumaraswamy, David Diaz Diaz