Cellulose–water system’s state analysis by proton nuclear magnetic resonance and sorption measurements

Grunin, Yuriy B.; Grunin, Leonid; Schiraya, Veronika Yu.; Ivanova, Maria S.; Masas, D. S.

doi:10.1186/s40643-020-00332-8

Cited by 11 publications

(5 citation statements)

References 54 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In addition, some patients have anxiety before the examination due to insufficient cognition of MRI enhancement scanning, which is unfavorable to the development of the examination. Therefore, nursing measures should also be taken to intervene in the process of nuclear MRI enhancement imaging [ 10 , 11 ].…”

Section: Discussionmentioning

confidence: 99%

Observation and Nursing of Adverse Reactions in Severe Patients with Enhanced MRI

Dai

Peng

2022

Journal of Healthcare Engineering

View full text Add to dashboard Cite

In order to explore the observation and nursing of adverse reactions in severe patients with enhanced magnetic resonance imaging, a family nursing service model was proposed in patients with enhanced magnetic resonance imaging. 150 patients who underwent enhanced magnetic resonance imaging in a hospital were selected as the research objects. The patients were divided into two groups by random number table method. 75 patients in the control group received routine nursing intervention and 75 patients in the observation group received family nursing service intervention. The anxiety score, depression score, examination time, one-time success rate, comfort score, incidence of adverse reactions, excellent image quality rate and nursing satisfaction were compared between the two groups. The results showed that the anxiety score and depression score of the observation group were lower than those of the control group (P < 0.05), the examination time of the observation group was significantly shorter than that of the control group (P < 0.05), and the comfort score and one-time success rate of the observation group were significantly higher than those of the control group (P < 0.05). The incidence of adverse reactions was significantly lower than that in the control group (P < 0.05), the excellent and good image quality rate (95.00%) and nursing satisfaction (97.22%) were significantly higher than those in the control group (83.00%, 86.56%). This shows that the application effect of family nursing service mode in magnetic resonance enhanced scanning is remarkable. Therefore, the use of family care mode in MRI patient examination can effectively reduce patients' anxiety and depression scores, shorten examination time, reduce adverse reactions, improve the success rate of one-time examination, improve patients' comfort during examination and patients' evaluation of nursing services. The effect is ideal and worthy of clinical research and promotion.

show abstract

Section: Discussionmentioning

confidence: 99%

Observation and Nursing of Adverse Reactions in Severe Patients with Enhanced MRI

Dai

Peng

2022

Journal of Healthcare Engineering

View full text Add to dashboard Cite

show abstract

“…The ability of glucopyranose rings to form intramolecular and intermolecular hydrogen bonds, however, leads to the aggregation of elementary fibrils even in these spaces. This allows us to attribute the most reactive amorphous part of cellulose exclusively to the surface of the crystallites in the interfibrillar pores [46]. The processing of cellulose fibers often changes both the structure and the sorption properties of the polymer [47].…”

Section: Structural Organization Of Cellulosementioning

confidence: 99%

Nanocellulose-Based Thermoplastic Polyurethane Biocomposites with Shape Memory Effect

Gorbunova

Grunin²,

Morris

et al. 2023

J. Compos. Sci.

View full text Add to dashboard Cite

In 2020, we published a review on the study of semi-crystalline thermoplastic polyurethane elastomers and composites based on the shape memory effect. The shape recovery ability of such polymers is determined by their sensitivity to temperature, moisture, and magnetic or electric fields, which in turn are dependent on the chemical properties and composition of the matrix and the nanofiller. Nanocellulose is a type of nanomaterial with high strength, high specific surface area and high surface energy. Additionally, it is nontoxic, biocompatible, environmentally friendly, and can be extracted from biomass resources. Thanks to these properties, nanocellulose can be used to enhance the mechanical properties of polymer matrices with shape memory effect and as a switching element of shape memory. This review discusses the methods for producing and properties of nanocellulose-based thermo-, moisture-, and pH-sensitive polyurethane composites. The synergistic effect of nanocellulose and carbon nanofillers and possible applications of nanocellulose-based thermoplastic polyurethane biocomposites with shape memory effect are discussed. A brief description of nanocellulose terminology is also given, along with the structure of shape memory thermoplastic polyurethanes. There is significant interest in such materials for three primary reasons: the possibility of creating a new generation of biomaterials, improving the environmental friendliness of existing materials, and exploiting the natural renewability of cellulose sources.

show abstract

“…Special studies have been devoted to disclosing the sorption mechanism of Water Vapor (WV) by hydrophilic polymers. Various sorption models have been proposed, such as the Langmuir model of monomolecular surface adsorption [4,5] , BET, BAG, and GDW models of multimolecular surface adsorption [5][6][7][8][9][10][11], as well as models of Henry, Flory-Huggins, and Hailwood-Horrobin of water dissolution in polymers [6,[11][12][13]. In addition, also empirical models were used to describe the sorption isotherms [5].…”

Section: Introductionmentioning

confidence: 99%

Models of Water Vapor Sorption by Hydrophilic Polymers

Ioelovich¹

2022

Adv Res Org Inorg Chem

View full text Add to dashboard Cite

Various models and equations of water vapor sorption by hydrophilic polymers were considered. It was shown that these models often do not correspond to the sorption mechanism. These models can be mathematically adapted to the experimental isotherm regardless of the real sorption mechanism. Even when sorption occurs according to the same mechanism, various authors use different models and equations. This study is based on the volume absorption mechanism and the Van Krevelen method of group contributions. As a result, a universal physicochemical equation was proposed, which makes it possible to adequately describe the sorption isotherms of amorphous hydrophilic polymers knowing only the chemical formulas of repeating units of these polymers. To calculate the sorption isotherms for semicrystalline samples, it is necessary to use an additional parameter, namely the degree of amorphicity (Y). The adequacy of the derived equation was verified for samples of cellulose and other natural polysaccharides, as well as for samples of synthetic hydrophilic polymers such as polyvinyl alcohol, polyamide-6, and polycaprolactone having various Y-values. The verification showed that the experimental isotherms are almost identical to the isotherms calculated by the universal equation.

show abstract

Cellulose–water system’s state analysis by proton nuclear magnetic resonance and sorption measurements

Cited by 11 publications

References 54 publications

Observation and Nursing of Adverse Reactions in Severe Patients with Enhanced MRI

Observation and Nursing of Adverse Reactions in Severe Patients with Enhanced MRI

Nanocellulose-Based Thermoplastic Polyurethane Biocomposites with Shape Memory Effect

Models of Water Vapor Sorption by Hydrophilic Polymers

Contact Info

Product

Resources

About