scholarly journals Synthesis, characterization and photoinduced curing of polysulfones with (meth)acrylate functionalities

2010 ◽  
Vol 6 ◽  
Author(s):  
Cemil Dizman ◽  
Sahin Ates ◽  
Lokman Torun ◽  
Yusuf Yagci
Keyword(s):  
Molecular Weight ◽  
Thermal Properties ◽  
Thermal Gravimetric Analysis ◽  
Gravimetric Analysis ◽  
Condensation Polymerization ◽  
Thermal Gravimetric ◽  
Uv Curable ◽  
H Nmr ◽  
Rate Of Polymerization ◽  
Photo Curing

The UV-curable telechelic polysulfones with (meth)acrylate functionalities were synthesized by condensation polymerization and subsequent esterification. The final polymers and intermediates at various stages were characterized by 1H NMR, FT-ATR, and GPC. The oligomeric films prepared from the appropriate solutions containing these telechelics and 2,2-dimethoxy-2-phenylacetophenone (DMPA) as the photoinitiator undergo rapid polymerization upon irradiation forming insoluble networks. The photo-curing behavior was investigated by photo-DSC and the effects of the molecular weight of the polysulfone precursor and type of functionality on the rate of polymerization and conversion were evaluated. Thermal properties of the photochemically cured films were studied by differential scanning calorimeter (DSC) and thermal gravimetric analysis (TGA).

The Influence of Humidity on the Structure of MoS2(PEO)1.3 Nanocomposites

2000 ◽  
Vol 661 ◽  
Author(s):  
Philippe Westreich ◽  
Datong Yang ◽  
Robert F. Frindt
Keyword(s):  
Molecular Weight ◽  
Relative Humidity ◽  
Ethylene Oxide ◽  
Thermal Gravimetric Analysis ◽  
Basal Plane ◽  
Gravimetric Analysis ◽  
Thermal Gravimetric ◽  
X Ray ◽  
Atmospheric Relative Humidity ◽  
Coherence Lengths

ABSTRACTLayered nanocomposites of molybdenum disul.de (MoS2) andp oly (ethylene oxide) (PEO) were studied using x-ray di.raction of powder and oriented thin.lm samples. Thermal gravimetric analysis provided information on the composition of the material. The e.ects of the molecular weight of PEO andthe atmospheric relative humidity on the structure were also investigated. A basal plane spacing of 14.3 °, corresponding to an expansion of 8.1 ° between MoS2 layers, was foundfor dry samples, in agreement with the literature. At about 30% humidity, the expansion increases to 10.6°. This increase corresponds approximately to the thickness of one monolayer of water. The spacing is constant until around80% humidity, when the expansion begins to increase again, reaching up to 25 ° near 100% humidity. X-ray coherence lengths in the direction perpendicular to the planes averaged13, 7 and 2 MoS2 layers for the dry, 58% humid and nearly 100% humid samples, respectively.

Thermal and Flammability Properties of Polypropylene Filled Rice Bran/Sepiolite Composite

2014 ◽  
Vol 695 ◽  
pp. 243-246
Author(s):  
Siti Nadia Aini Ghazali ◽  
Zurina Mohamad
Keyword(s):  
Thermal Stability ◽  
Thermal Properties ◽  
Rice Bran ◽  
Thermal Gravimetric Analysis ◽  
Gravimetric Analysis ◽  
Thermal Gravimetric ◽  
Screw Extruder ◽  
Compression Moulding ◽  
Good Thermal Stability ◽  
Twin Screw

Polypropylene that consist of different loading of rice bran (RB) (0wt%, 10wt%, 20wt%, 30wt%, 40wt%) and sepiolite (SEP) (0phr, 1phr, 2phr, 3phr, 4phr, 5phr) were prepared by twin-screw extruder followed by compression moulding. The effect of RB and SEP loading on the thermal properties and flammability properties were studied through thermal gravimetric analysis (TGA) and UL94 horizontal burning test (UL94HB) respectively. The result from TGA revealed that RB content at 40%wt and SEP content at 4phr showed good thermal stability. The sepiolite used for flammability properties had improved the flammability matrix; however, the amount of SEP use in this study is not enough to improve the flammability of PP/RB composite.

scholarly journals Superparamagnetic Behaviour and Surface Analysis of Fe3O4/PPY/CNT Nanocomposites

2020 ◽  
Vol 2020 ◽  
pp. 1-6
Author(s):  
Juniastel Rajagukguk ◽  
Pintor Simamora ◽  
C. S. Saragih ◽  
Hairus Abdullah ◽  
Noto Susanto Gultom ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Thermal Properties ◽  
Surface Analysis ◽  
Thermal Gravimetric Analysis ◽  
Potential Application ◽  
Gravimetric Analysis ◽  
Thermal Gravimetric ◽  
Superparamagnetic Behaviour ◽  
Bet Analysis ◽  
Natural Iron

The superparamagnetic property of nanomaterials such as Fe3O4 has been considered to be promising for various applications. In this paper, Fe3O4/PPY/CNT nanocomposites were synthesized with utilizing natural iron sand by a coprecipitation method. The as-precipitated Fe3O4 NPs were combined with carbon nanotubes (CNTs) using conductive polypyrrole (PPY) as linking agents. The Fe3O4/PPY/CNT nanocomposites were systematically characterized by FE-SEM, EDS, XRD, BET, and FTIR. Furthermore, the effects of CNTs on magnetic and thermal properties of nanocomposites were investigated by VSM and thermal gravimetric analysis (TGA), respectively. The composites exhibited significant decrease of coercivity value with the content of CNTs increasing. The VSM result confirmed that Fe3O4/PPY/CNT nanocomposites were superparamagnetic. It was found that by increasing the amounts of CNTs, the magnetization of Fe3O4/PPY/CNT nanocomposites gradually decreased. The addition of CNTs is intended to improve the mesoporous property as proved by BET analysis which has the potential application as a nanocatalyst.

Thermal gravimetric analysis of in-situ crosslinked nanocellulose whiskers • poly(methyl vinyl ether-co-maleic acid) • polyethylene glycol

TAPPI Journal ◽  
2011 ◽  
Vol 10 (4) ◽  
pp. 29-33
Author(s):  
LEE A. GOETZ ◽  
AJI P. MATHEW ◽  
KRISTIINA OKSMAN ◽  
ARTHUR J. RAGAUSKAS
Keyword(s):  
Thermal Stability ◽  
Polyethylene Glycol ◽  
Vinyl Ether ◽  
Thermal Gravimetric Analysis ◽  
Maleic Acid ◽  
Gravimetric Analysis ◽  
Thermal Gravimetric ◽  
Methyl Vinyl ◽  
Methyl Vinyl Ether

The thermal stability and decomposition of in-situ crosslinked nanocellulose whiskers – poly(methyl vinyl ether-co-maleic acid) – polyethylene glycol formulations (PMVEMA-PEG), (25%, 50%, and 75% whiskers) – were investigated using thermal gravimetric analysis (TGA) methods. The thermal degradation behavior of the films varied according to the percent cellulose whiskers in each formulation. The presence of cellulose whiskers increased the thermal stability of the PMVEMA-PEG matrix.

Alternating poly(ester amide)s from glutaric anhydride and α,ω-aminoalcohols: synthesis and thermal properties

e-Polymers ◽  
2003 ◽  
Vol 3 (1) ◽  
Author(s):  
Thomas Fey ◽  
Helmut Keul ◽  
Hartwig Höcker
Keyword(s):  
Molecular Weight ◽  
Thermal Properties ◽  
Homologous Series ◽  
Average Molecular Weight ◽  
Number Average Molecular Weight ◽  
Melting Points ◽  
Glutaric Anhydride ◽  
H Nmr ◽  
Activating Agent ◽  
Dimethylformamide Solution

Abstract Alternating poly(ester amide)s 6a - e were prepared by polycondensation of α-carboxyl-ω-hydroxyamides 3a - e which were obtained by aminolysis of glutaric anhydride (1) and α,ω-aminoalcohols, H2N-(CH2)x-OH (x = 2 - 6) 2a - e. The polycondensation was performed in dimethylformamide solution using a carbodiimide as activating agent, or in bulk with Bu2Sn(OMe)2, Ti(OBu)4 and Sn(octoate)2 as a catalyst. For the polycondensation in bulk, the influence of catalyst and of temperature on the number-average molecular weight was studied. 1H NMR analyses of the poly(ester amide)s clearly show the alternating microstructure. The poly(ester amide)s from glutaric anhydride and the homologous series of α,ω-aminoalcohols are semicrystalline materials; their melting points show the odd/even effect observed for other poly(ester amide)s.

scholarly journals The Thermal Properties of Polyurethane/Neoprene Blends on Prosthetic Foot

2020 ◽  
Vol 990 ◽  
pp. 106-110
Author(s):  
Mohd Zulkifli Mohamad Noor ◽  
Mohamad Anas Mohd Azmi ◽  
Mohd Shaiful Zaidi Mad Desa ◽  
Mohd Bijarimi Mat Piah ◽  
Azizan Ramli
Keyword(s):  
Thermal Stability ◽  
Thermal Properties ◽  
Low Cost ◽  
Decomposition Temperature ◽  
Gravimetric Analysis ◽  
Thermal Gravimetric ◽  
Prosthetic Foot ◽  
Reinforced Polymer ◽  
New Material ◽  
Thermal Stability Of

Neoprene reinforced polymer has become an attraction in current research and development of new material blend. In this invention, neoprene was chosen to be enhance to polyurethane because of their superior properties that possess extraordinary mechanical, electrical, optical and thermal properties on prosthetic foot. In this research, polyurethane was chosen due to good rigidity, easy processing and low cost. The reinforcement polyurethane with neoprene is expected to improve the properties of polyurethane. The objective of this research was conducted to investigate the effect of neoprene contents on thermal properties of polyurethane reinforced neoprene on prosthetic foot. The effect of neoprene on thermal properties neoprene reinforced polyurethane was analysed in term of its thermal stability by thermal gravimetric analysis (TGA). Moreover, the visual of small topographic details on the surface of polyurethane/neoprene blends will be examined by scanning electron microscope (SEM). Based on result, the thermal properties show the great enhancement at high neoprene contents which is 1.0wt%. The thermal stability of polyurethane reinforced neoprene improves when the temperature where decomposition starts to occurs are higher than decomposition temperature of pure polyurethane. Then, thermal conductivity of polyurethane shows the great improvement after the addition of neoprene. Lastly, the smooth surface and visible of sheets pattern on surface represent the present of neoprene disperse into polymer that enhance brittleness. Thus, the presence of neoprene has clearly enhanced the thermal stability of the polyurethane. Table 1 shows formulation of neoprene and polyurethane.

Sign in / Sign up

Export Citation Format

Share Document