scholarly journals Synthesis and Characterization of Poly(Acrylic Acid)/Organo-Modified Nanohydroxyapatite Nanocomposites: Thermal, Optical and Biocompatibility Properties

2018 ◽  
Vol 18 (3) ◽  
pp. 54-67 ◽  
Author(s):  
M. E. Diken ◽  
S. Doğan ◽  
Y. Turhan ◽  
M. Doğan
Keyword(s):  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Simulated Body Fluid ◽  
Acrylic Acid ◽  
Body Fluid ◽  
Synthesis And Characterization ◽  
Uv Absorbance ◽  
Poly Acrylic Acid

AbstractThe aim of this study was to investigate the structural, thermal, optical and biocompatibility properties of poly(acrylic acid)(PAA)/organo-modified nanohydroxyapatite (OM-nHAp) nanocomposites synthesized by solvent intercalation method. The characterization of PAA/OM-nHAp nanocomposites was made by different techniques. SEM and TEM results showed that OM-nHAp particles were dispersed in the nanoscale into PAA matrix and that they were uniformly distributed within film. Glass transition temperature of PAA increased with OM-nHAp content. Ultraviolet (UV) absorbance experiments showed that PAA had a higher UV transmission than its nanocomposites. The biocompatibility of nanocomposites was also examined in simulated body fluid.

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.

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 new silicon-containing poly(arylene-1,3,4-oxadiazole)s

1995 ◽  
Vol 7 (4) ◽  
pp. 493-501 ◽  
Author(s):  
I Sava ◽  
B Schulz ◽  
S Zhu ◽  
M Bruma
Keyword(s):  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Synthesis And Characterization ◽  
Polycondensation Reaction ◽  
Cyclization Process ◽  
Film Forming ◽  
Temperature Solution ◽  
Solution Polycondensation

New silicon-containing aromatic polyhydrazides were synthesized by low-temperature solution polycondensation reaction of bis(p-chlorocarbonylphenyl)diphenylsilane with various aromatic dihydrazides, or of bis(p-carbohydrazidophenyl)diphenylsilane with diacid chlorides. The corresponding poly(arylene-1,3,4-oxadiazole)s wvere prepared by thermal cyclodehydration in the solid state. The cyclization process takes place at temperatures in the range of 250-300 IC. The resulting silicon-containing poly(arylene-1,3,4-oxadiazole)s are soluble in common organic solvents and have good film-forming abilities. They are stable up to 420-480 'C and their glass transition temperature is in the range of 262-278C.

scholarly journals Synthesis and characterization of methylammonium phosphates as crystalline approximants for anhydrous, low melting phosphate glasses

RSC Advances ◽  
2019 ◽  
Vol 9 (4) ◽  
pp. 1822-1830
Author(s):  
Martin Mangstl ◽  
Jan Konrad Wied ◽  
Johannes Weber ◽  
Christian Pritzel ◽  
Reinhard Trettin ◽  
...  
Keyword(s):  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Phosphate Glass ◽  
Phosphate Glasses ◽  
Synthesis And Characterization ◽  
The Novel

The novel glass shows the lowest glass transition temperature known for binary phosphate glass systems without acidic protons.

Controlled molecular weight poly(arylene ether benzimidazole)s endcapped with benzimidazole and ethynyl groups

1995 ◽  
Vol 7 (1) ◽  
pp. 41-53 ◽  
Author(s):  
J G Smith ◽  
J W Connell ◽  
E J Siochi ◽  
P M Hergenrother
Keyword(s):  
Molecular Weight ◽  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Synthesis And Characterization ◽  
Solvent Resistance ◽  
Arylene Ether

A series of controlled molecular weight poly(arylene ether benzimidazole)s (PAEBIs) endcapped with either benzimidazole, ethynyl or phenylethynyl groups was prepared and characterized. PAEBIs endcapped with either ethynyl or phenylethynyl groups were thermally cured to provide polymers with improved moisture and solvent resistance and higher glass transition temperature than PAEBIs without reactive endcaps. The synthesis and characterization of a series of PAEBIs endcapped with benzimidazole, ethynyl and phenylethynyl groups prepared at stoichiometric imbalances of 7 and 10 mol% are discussed.

Synthesis and Characterization of Novel Polyfluorene Derivatives

2013 ◽  
Vol 815 ◽  
pp. 443-447
Author(s):  
Li Di Zhou ◽  
Xiao Dan Hu ◽  
Shao Hong Wang ◽  
Zhao Xia Hou ◽  
Mei Han Wang
Keyword(s):  
Glass Transition ◽  
Thermal Properties ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Solid State ◽  
Coupling Reaction ◽  
Synthesis And Characterization ◽  
Sonogashira Coupling ◽  
Sonogashira Coupling Reaction

A novel series of copolymers containing fluorene units are synthesized by Sonogashira coupling reaction in mild condition. Benzene, naphthalene and anthracene are co-polymerized with ethynylfluorene, respectively. The structures are confirmed by NMR, Mass, Elemental analysis and GPC. The polymers have good thermal properties with glass-transition temperature of 90-155°C(Tg), and they have bandgaps from 2.21-2.77 eV. The results of photoluminescence in solid state show that introduction of huge chromophore could effectively suppress the formation of aggregates and excimers which typically cause red-shifted or new emission.

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