Regenerated and mercerized celluloses are widely used in our daily life and industries. Examples include clothes, medical supplies, and separation membranes. In such applications, the true density is an important derived physical quantity for refining the structural designs of regenerated and mercerized celluloses. Here, we report the true density-crystallinity correlation of regenerated and mercerized celluloses. Seven samples were prepared through either dissolution-regeneration or mercerization, and the true density of each sample was measured by helium gas pycnometry. The crystallinity was evaluated by solid-state C nuclear magnetic resonance spectroscopy based on the ratio of the carbon atoms in the crystallite core to those at crystallite surfaces and in the surrounding amorphous matrix. We found that the true density of regenerated and mercerized celluloses is directly proportional to crystallinity, irrespective of the preparation process. Additionally, the molecular packing density at the crystallite surfaces was found to be similar to that in the amorphous matrix.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1021/acs.biomac.2c01067 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Linear Correlation between True Density and Crystallinity of Regenerated and Mercerized Celluloses.
Biomacromolecules
February 2023
Department of Biomaterial Sciences, Graduate School of Agricultural and Life Sciences, The University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo113-8657, Japan.
Regenerated and mercerized celluloses are widely used in our daily life and industries. Examples include clothes, medical supplies, and separation membranes. In such applications, the true density is an important derived physical quantity for refining the structural designs of regenerated and mercerized celluloses.
View Article and Find Full Text PDFPreparation, Characterization and Application of Amorphized Cellulose-A Review.
Polymers (Basel)
December 2021
Designer Energy, 2, Bergman St., Rehovot 7670504, Israel.
This review describes the methods of cellulose amorphization, such as dry grinding, mercerization, treatment with liquid ammonia, swelling in solvents, regeneration from solutions, etc. In addition, the main characteristics and applications of amorphized celluloses are discussed. An optimal method for preparing completely amorphous cellulose (CAC) via the treatment of original cellulose material with a cold NaOH/Urea-solvent at the solvent to cellulose ratio R ≥ 5 is proposed.
View Article and Find Full Text PDFCellulose nanosphere: Preparation and applications of the novel nanocellulose.
Carbohydr Polym
February 2022
Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Engineering Plastics, Institute of Chemistry, Chinese Academy of Sciences (CAS), Beijing 100190, China; University of Chinese Academy of Sciences, Beijing 100049, China. Electronic address:
Over the past few years, cellulose nanosphere (CNS) has gained growing attention and rapid development. As a new type of nanocellulose materials, CNS can be prepared from native cellulose by using methods which have been adopted extensively to prepare the well-known nanocelluloses, i.e.
View Article and Find Full Text PDFBiochemical and X-ray micro-computed tomographic analyses of critical size bone defects grafted with autogenous bone and mercerized bacterial cellulose membranes salified with alendronate.
J Oral Biosci
December 2021
Department of Stomatology, School of Dentistry, Federal University of Parana, 632 Prefeito Lothario Meissner Avenue, Curitiba, 80210-170, PR, Brazil. Electronic address:
Objectives: This study aimed to evaluate the repair of critical-sized bone defects grafted with autogenous bone and mercerized bacterial cellulose membranes (BCm) salified with alendronate (ALN).
Methods: Forty-eight male Wistar rats underwent surgery to create a 5 mm-diameter bone defect in the calvarium. The removed bone was particularized, regrafted into the defect, and covered by a BCm according to the group: control group (CG), simply mercerized BCm; group 1 (G1), negatively charged BCm (BCm-CM) salified with ALN; and group 2 (G2), positively charged BCm (BCm-DEAE) salified with ALN.
Article Synopsis
- The cold alkaline treatment (mercerization) of cellulose is used in industry to enhance the material by removing hemicelluloses, leading to a structural transition from cellulose I to cellulose II.
- Cellulose II is characterized by an antiparallel arrangement of macromolecules, which is seen in both mercerized and regenerated cellulose, but the formation of this structure during mercerization is significantly complex.
- This paper examines theoretical challenges concerning the antiparallel structure of mercerized cellulose, compiling existing experimental findings to support the discussion.
Want AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!