scholarly journals Characterization of Chlorhexidine-Impregnated Cellulose-Based Hydrogel Films Intended for the Treatment of Periodontitis

2021 ◽  
Vol 2021 ◽  
pp. 1-7
Author(s):  
Ola Tarawneh ◽  
Imad Hamadneh ◽  
Rawan Huwaitat ◽  
Ameen Rasheed Al-Assi ◽  
Abdulla El Madani
Keyword(s):  
Glass Transition ◽  
Transition Temperature ◽  
Tooth Loss ◽  
Permanent Tooth ◽  
Similar Activity ◽  
Zones Of Inhibition ◽  
Lower Glass Transition Temperature ◽  
Hydrogel Films ◽  
Localized Form

Periodontitis comprises a chronic inflammation that is initiated by microbiota biofilm. If left untreated, periodontitis may lead to permanent tooth loss. Herein, we propose to design and improve a localized form of therapy comprising a chlorhexidine-impregnated hydrogel. Hydrogel films were prepared by varying the ratio between cellulose (MCC) and carboxymethylcellulose sodium (CMC) using the crosslinker epichlorohydrin (ECH). The hydrogel was loaded with chlorhexidine. Increasing the CMC ratio led to a reduction in the number of pores, an increase in their size, lower glass transition temperature ( T g ), decreased Young’s modulus, and increased film stretching and affected the time of release. Bacterial and fungal zones of inhibition showed similar activity and were not affected by the CMC and MCC ratio. Hydrogels loaded with chlorhexidine prevented the growth of S. oralis and C. albicans microorganisms and may provide a promising local delivery system for treating periodontitis.

Synthesis and characterization of polyurethanes bearing carbosilane segments

RSC Advances ◽  
2016 ◽  
Vol 6 (97) ◽  
pp. 94803-94808
Author(s):  
Ayumu Karimata ◽  
Kozo Matsumoto ◽  
Takeshi Endo
Keyword(s):  
Thermal Stability ◽  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Synthesis And Characterization ◽  
And Storage ◽  
Lower Glass Transition Temperature

New polyurethanes bearing carbosilane segment (1a–c) were synthesized and found to exhibit lower glass transition temperature and storage moduli than corresponding reference polyurethanes 2a–c, while thermal stability was retained.

scholarly journals Design of an n-type low glass transition temperature radical polymer

2021 ◽  
Author(s):  
Teng Chi ◽  
Siddhartha Akkiraju ◽  
Zihao Liang ◽  
Ying Tan ◽  
Ho Joong Kim ◽  
...  
Keyword(s):  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Synthesis And Characterization ◽  
Design Synthesis

We document the design, synthesis, and characterization of the first low glass transition temperature, n-type (i.e., preferentially-reduced) radical polymer.

Thermal Properties of Bi2O3-B2O3-ZnO Glass System

2006 ◽  
Vol 510-511 ◽  
pp. 578-581 ◽  
Author(s):  
Yu Jin Kim ◽  
Seong Jin Hwang ◽  
Hyung Sun Kim
Keyword(s):  
Glass Transition ◽  
Thermal Properties ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Lead Oxide ◽  
Lead Free ◽  
Oxide Glasses ◽  
Glass Formation Region ◽  
Formation Region ◽  
Lower Glass Transition Temperature

Oxide glasses having lower glass transition temperature are widely used in electric devices. The oxide glasses usually contain lead oxide. Recently, lead oxide glasses have been replaced with lead-free oxide glasses because of the environmental pollution. We investigated the thermal properties and the glass formation region in the Bi2O3-B2O3-ZnO ternary system. The results showed that the ratio of Tg/Tl of the bismate glasses is around 0.55, which is lower than the value of ratio 0.67, the two-third rule (Tg/ Tl=2/3)

Research and Characterization of CaO-SiO2-B2O3-Al2O3-La2O3 Sealant with Different Alumina for ITSOFC

2013 ◽  
Vol 750-752 ◽  
pp. 562-565
Author(s):  
Biao Qian ◽  
Jian Jun Yang ◽  
Jie Yu ◽  
Wen Hui Ma ◽  
Bo Yu ◽  
...  
Keyword(s):  
Glass Transition ◽  
Transition Temperature ◽  
Anode Materials ◽  
Solid Oxide ◽  
Oxide Fuel ◽  
Crystal Temperature ◽  
Alumina Tube ◽  
Melting Method ◽  
Temperature Melting

The CaO-SiO2-B2O3-Al2O3-La2O3 sealants with different alumina contents were fabricated by high-temperature melting method for intermediate temperature solid oxide fuel cell (ITSOFC). The glass transition temperature (Tg) and crystal temperature (Ts) of the sealant with different alumina content was characterized by TG-DSC. And the composition phase of the sealant was detected by XRD. The resistivity of sealant tested by electrochemical workstation was higher than 22 kΩ·cm2, which met the requirement for ITSOFC. Through the detecting of the wetting angle, the adhesion of sealant and anode materials was very good, and the single cell sealed with alumina tube successfully.

scholarly journals Development and Physical Characterization of α-Glucan Nanoparticles

Molecules ◽  
2020 ◽  
Vol 25 (17) ◽  
pp. 3807
Author(s):  
Kervin O. Evans ◽  
Christopher Skory ◽  
David L. Compton ◽  
Ryan Cormier ◽  
Gregory L. Côté ◽  
...  
Keyword(s):  
High Pressure ◽  
Glass Transition ◽  
Transition Temperature ◽  
Leuconostoc Mesenteroides ◽  
Elevated Temperatures ◽  
High Pressure Homogenization ◽  
Hydrophobic Core ◽  
Fluorescence Measurements ◽  
Exposure Measurements

α-Glucans that were enzymatically synthesized from sucrose using glucansucrase cloned from Leuconostoc mesenteroides NRRL B-1118 were found to have a glass transition temperature of approximately 80 °C. Using high-pressure homogenization (~70 MPa), the α-glucans were converted into nanoparticles of ~120 nm in diameter with a surface potential of ~−3 mV. Fluorescence measurements using 1,6-diphenyl-1,3,5-hexatriene (DPH) indicate that the α-glucan nanoparticles have a hydrophobic core that remains intact from 10 to 85 °C. α-Glucan nanoparticles were found to be stable for over 220 days and able to form at three pH levels. Accelerated exposure measurements demonstrated that the α-glucan nanoparticles can endure exposure to elevated temperatures up to 60 °C for 6 h intervals.

scholarly journals Polarization and Piezoelectric Properties of a Nitrile Substituted Polyimide

1996 ◽  
Vol 459 ◽  
Author(s):  
Joycelyn Simpson ◽  
Zoubeida Ounaies ◽  
Catharine Fay
Keyword(s):  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Remanent Polarization ◽  
Piezoelectric Properties ◽  
Synthesis And Characterization

ABSTRACTThis research focuses on the synthesis and characterization of a piezoelectric (β-CN)-APB/ODPA polyimide. The remanent polarization and piezoelectric d31 and g33 coefficients are reported to assess the effect of synthesis variations. Each of the materials exhibits a level of piezoelectricity which increases with temperature. The remanent polarization is retained at temperatures close to the glass transition temperature of the polyimide.

Synthesis and Characterization of Carboxyl-Terminated Hyperbranched Polyester

2014 ◽  
Vol 665 ◽  
pp. 327-330
Author(s):  
Shi Jie Niu ◽  
Jian Wang ◽  
Yu Qing Bai ◽  
Ming Tao Run
Keyword(s):  
Glass Transition ◽  
Sodium Acetate ◽  
Succinic Anhydride ◽  
Molar Ratio ◽  
Synthesis And Characterization ◽  
Hydroxyl Groups ◽  
Hyperbranched Polyester ◽  
End Groups ◽  
Lower Glass Transition Temperature

In order to prepare carboxyl-terminated hyperbranched polyester (HBP-COOH), succinic anhydride was used to modify hydroxyl-terminated hyperbranched polyester (HBP-OH), and the influences of the solvents, catalysts and time on the product’s structure were investigated. When THF is used as the solvent, sodium acetate as the catalyst, the molar ratio of succinic anhydride and hydroxyl groups is 3:1, and the reaction time is 6 h at 65°C, the modification extent of the hydroxyl groups is about 99% with about 95% yield. HBP-COOH has much lower glass transition temperature than that of HBP-OH due to its long and flexible end-groups.

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