Hybrid Adsorbent Based on Zeolite NaX Modified with Hyperbranched Polyester Poly(N-benzoylthiocarbamate)

2021 ◽  
Author(s):  
Aleksei Maksimov ◽  
Alina Vagapova ◽  
Marianna Kutyreva ◽  
Gennadiy Kutyrev
Keyword(s):  
Hyperbranched Polyester ◽  
Zeolite Nax

Neutron Diffraction and Computational Study of Zeolite NaX:  Influence of SIII‘ Cations on Its Complex with Benzene

1997 ◽  
Vol 101 (23) ◽  
pp. 4559-4564 ◽  
Author(s):  
Gerardo Vitale ◽  
Caroline F. Mellot ◽  
Lucy M. Bull ◽  
Anthony K. Cheetham
Keyword(s):  
Neutron Diffraction ◽  
Computational Study ◽  
Zeolite Nax

Studies on electrospun polyvinylidene fluoride/aliphatic hyperbranched polyester (Generation-1) blend based piezoelectric sensors

2021 ◽  
Author(s):  
P. Lakshmi Praba ◽  
R. Gunasekhar ◽  
D. Manjula Dhevi ◽  
B. Indumathy ◽  
Priyanka Yadav ◽  
...  
Keyword(s):  
Polyvinylidene Fluoride ◽  
Piezoelectric Sensors ◽  
Hyperbranched Polyester

scholarly journals Effect of Terminal Groups on Thermomechanical and Dielectric Properties of Silica–Epoxy Composite Modified by Hyperbranched Polyester

Polymers ◽  
2021 ◽  
Vol 13 (15) ◽  
pp. 2451
Author(s):  
Jianwen Zhang ◽  
Dongwei Wang ◽  
Lujia Wang ◽  
Wanwan Zuo ◽  
Lijun Zhou ◽  
...  
Keyword(s):  
Dielectric Constant ◽  
Dielectric Properties ◽  
Binding Energy ◽  
Epoxy Resin ◽  
Volume Fraction ◽  
Epoxy Composite ◽  
Mean Square Displacement ◽  
Mean Square ◽  
Hyperbranched Polyester ◽  
Free Volume Fraction

To study the effect of hyperbranched polyester with different kinds of terminal groups on the thermomechanical and dielectric properties of silica–epoxy resin composite, a molecular dynamics simulation method was utilized. Pure epoxy resin and four groups of silica–epoxy resin composites were established, where the silica surface was hydrogenated, grafted with silane coupling agents, and grafted with hyperbranched polyester with terminal carboxyl and terminal hydroxyl, respectively. Then the thermal conductivity, glass transition temperature, elastic modulus, dielectric constant, free volume fraction, mean square displacement, hydrogen bonds, and binding energy of the five models were calculated. The results showed that the hyperbranched polyester significantly improved the thermomechanical and dielectric properties of the silica–epoxy composites compared with other surface treatments, and the terminal groups had an obvious effect on the enhancement effect. Among them, epoxy composite modified by the hyperbranched polyester with terminal carboxy exhibited the best thermomechanical properties and lowest dielectric constant. Our analysis of the microstructure found that the two systems grafted with hyperbranched polyester had a smaller free volume fraction (FFV) and mean square displacement (MSD), and the larger number of hydrogen bonds and greater binding energy, indicating that weaker strength of molecular segments motion and stronger interfacial bonding between silica and epoxy resin matrix were the reasons for the enhancement of the thermomechanical and dielectric properties.

Piezoelectric characteristics of electrospun polyvinylidene fluoride/3rd generation hyperbranched polyester blend nanowebs

2021 ◽  
Author(s):  
Priyanka Yadav ◽  
D. Manjula Dhevi ◽  
R. Gunasekhar ◽  
B. Indumathy ◽  
Lakshmi Praba ◽  
...  
Keyword(s):  
Polyvinylidene Fluoride ◽  
Hyperbranched Polyester ◽  
Piezoelectric Characteristics

A novel route to improve the mechanical and rheological properties of HTPE/AP/Al propellant by adding a modified hyperbranched polyester

2020 ◽  
pp. 095400832098343
Author(s):  
Xiaomu Wen ◽  
Ximing Zhang ◽  
Keke Chen ◽  
Yunjun Luo
Keyword(s):  
Rheological Properties ◽  
Solid Propellant ◽  
Casting Process ◽  
Hyperbranched Polyester ◽  
Low Viscosity ◽  
Composite Solid Propellant ◽  
Static Tensile ◽  
Void Structure ◽  
Composite Solid ◽  
Hyperbranched Structure

Both better mechanical and rheological properties are pursued for composite solid propellant. In this work, varying proportions of a modified hyperbranched polyester (MHBPE) were added to HTPE/AP/Al propellant. The static tensile property as one kind of mechanical properties of MHBPE/HTPE/AP/Al propellant were found to be superior to those of blank HTPE/AP/Al propellant as a result of the entanglement and interpenetration of molecular chains caused by the introduction of the hyperbranched structure. Evaluations on the related improved creep resistance and stress relaxation performance further demonstrated the advantages of introduction of MHBPE to HTPE/AP/Al propellant. Rheological properties of HTPE/AP/Al propellant with and without MHBPE during the casting process were investigated and compared and the results confirmed the improvement benefiting from low viscosity and loose void structure. Thus, modified hyperbranched polyester provided a novel route to potentially meet the requirements for propellant manufacturing and applications.

Carbazole-Based Hyperbranched Polyester Polyol: Structural, Rheological, Thermal and Optical Properties

2021 ◽  
Vol 29 (4) ◽  
pp. 257-266
Author(s):  
Edwin A. Murillo ◽  
Margarita Cerón ◽  
M. Judith Percino
Keyword(s):  
Optical Properties ◽  
Hyperbranched Polyester ◽  
Polyester Polyol

Miscibility, crystallization and annealing studies of poly(vinylidene fluoride)/hyperbranched polyester blends

Polymer ◽  
2014 ◽  
Vol 55 (3) ◽  
pp. 886-895 ◽  
Author(s):  
Dhevagoti Manjula Dhevi ◽  
Arun Anand Prabu ◽  
Madhvesh Pathak
Keyword(s):  
Vinylidene Fluoride ◽  
Hyperbranched Polyester ◽  
Poly Vinylidene Fluoride
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