Synthesis and Characterization of Diaminophenylindane Based Polyimides via Ester-Acid Solution Imidization

1997 ◽  
Vol 9 (3) ◽  
pp. 345-352 ◽  
Author(s):  
I V Farr ◽  
T E Glass ◽  
Q Ji ◽  
J E McGrath
Keyword(s):  
Acid Solution ◽  
Molar Ratio ◽  
Synthesis And Characterization ◽  
Gravimetric Analysis ◽  
Thermal Gravimetric ◽  
Short Term ◽  
Scanning Calorimetry ◽  
Film Forming ◽  
Solution Polycondensation

The solution polycondensation of 1-(4-aminophenyl)-5(6)-aminoindane (DAPI) with a number of commercially available dianhydrides using the two-step ester-acid solution imidization route is described. High molecular weight polyimides were successfully synthesized from a 1:1 molar ratio of dianhydride to diamine. These film-forming systems have high glass transition temperatures (331–368 °C) and very good short-term thermal stability as judged by differential scanning calorimetry (DSC) and thermal gravimetric analysis (TGA). The fully cyclized polyimides are also highly soluble in common solvents.

Studies on bismaleimides and related materials: Part III. Synthesis and characterization of bismaleimiides derived from benzophenone, 1, 2-diphenylethane, 1, 4-diphenylbutane and condensed pyrazines

1994 ◽  
Vol 6 (1) ◽  
pp. 35-41
Author(s):  
P N Prestont ◽  
V K Shaht ◽  
S W Simpsont ◽  
I Soutar ◽  
N J Stewart
Keyword(s):  
Thermal Analysis ◽  
Differential Scanning Calorimetry ◽  
Oxidative Stability ◽  
Thermal Gravimetric Analysis ◽  
Dynamic Mechanical Thermal Analysis ◽  
Synthesis And Characterization ◽  
Gravimetric Analysis ◽  
Thermal Gravimetric ◽  
Scanning Calorimetry

New bismaleimides have been synthesised from diamines derived from benzophenone, 1,2-diphenylethane, 1,4-diphenylbutane, 2, 3-diphenylquinoxaline and 2, 3-diphenylnaphtho[2, 3-b]pyrazine. Cure profiles have been established by both differential scanning calorimetry (Dsc) and dynamic mechanical thermal analysis (DMTA). Cured resins prepared from the bismaleimide monomers were studied by thermal gravimetric analysis (TGA) with all materials exhibiting good thermal and thermo-oxidative stability.

Synthesis and characterization of diaminomaleonitrile-functionalized polystyrene grafts for application in pervaporation separation

2008 ◽  
Vol 62 (4) ◽  
Author(s):  
Hamada Abdel-Razik
Keyword(s):  
Chemical Structure ◽  
Thermal Characteristics ◽  
Gravimetric Analysis ◽  
Thermal Gravimetric ◽  
Optimum Conditions ◽  
Scanning Calorimetry ◽  
Phenol Water ◽  
Pervaporation Separation ◽  
Thermal Stability Of

AbstractSynthesis, characterization and application of diaminomaleonitrile (DAMN)-functionalized polystyrene grafts were studied. Dibenzoyle peroxide (BP) was used as an initiator. Optimum conditions for grafting were found to be c(DAMN) = 0.5 M, c(BP) = 0.016 M, θ = 85 °C and t = 4 h. Water uptake of the polystyrene graft membranes was found to increase with the increase of the grafting yield. The chemical structure, thermal characteristics and thermal stability of the obtained membranes were investigated by means of FTIR spectroscopy, differential scanning calorimetry, and thermal gravimetric analysis. Polystyrene graft membrane with the degree of grafting of up to 96 % was found to be useful for the pervaporation separation of phenol/water mixtures.

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.

Synthesis and Characterization of Segmented Copolymers of a Methylated Polyamide and a Thermotropic Liquid Crystalline Polyester

1989 ◽  
Vol 171 ◽  
Author(s):  
Gregory T. Pawlikowski ◽  
R. A. Weiss ◽  
S. J. Huang
Keyword(s):  
Differential Scanning Calorimetry ◽  
Composite Material ◽  
Block Copolymer ◽  
Liquid Crystalline ◽  
Synthesis And Characterization ◽  
Scanning Calorimetry ◽  
Segmented Copolymers ◽  
Liquid Crystalline Polyester ◽  
Solution Polycondensation

ABSTRACTA block copolymer consisting of liquid crystalline polyester segments and methylated polyamide segments has been synthesized. Solution polycondensation of acid chloride end-capped poly(terephthaloyl phenylhydroquinone) (LCP portion) with an amine terminated poly(N,N'-dimethylethylene sebacamide) was utilized to prepare the block copolymer. Characterization by differential scanning calorimetry, infrared spectroscopy, thermogravimetric analysis, optical microscopy and elemental analysis has been performed to verify the existence of the block copolymer that may have potential as a molecular composite material or self-reinforcing thermoplastic.

New polymer syntheses III. Synthesis and characterization of new unsaturated polycarbonates

1994 ◽  
Vol 6 (2) ◽  
pp. 149-154 ◽  
Author(s):  
Kamal I Aly
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Synthesis And Characterization ◽  
Gravimetric Analysis ◽  
Thermal Gravimetric ◽  
X Ray Diffraction ◽  
X Ray ◽  
1H Nuclear Magnetic Resonance ◽  
Elemental Analyses ◽  
Interesting Class

A new interesting class of linear unsaturated polycarbonates based on 3,5-bis(p-hydroxybenzylidene)-isopropylpiperidinone (T), 3,5-divanillylidene isopropylpiperidinone (IT), or 3,5-bis(m-hydroxybenzylidene)-isopropylpiperidinone (III) have been synthesized. An interfacial phosgenation technique carried out at ambient temperature was used for the synthesis of the polycarbonates. The resulting polycarbonates were characterized by elemental analyses, infrared spectroscopy, 1H nuclear magnetic resonance spectral analysis, solubility and viscometry. The thermal behaviour of the synthesized polymers was evaluated by thermal gravimetric analysis and correlated with their structures. The crystallinity of all polymers was examined by x-ray diffraction analysis.

Synthesis and characterization of poly(arylene ether)s and poly(arylene ether imidazole)s

1995 ◽  
Vol 7 (1) ◽  
pp. 69-79 ◽  
Author(s):  
P R McDaniel ◽  
R A Orwoll ◽  
J W Connell
Keyword(s):  
Epoxy Resins ◽  
Gravimetric Analysis ◽  
Thermal Gravimetric ◽  
Structure Property ◽  
Neat Resin ◽  
Scanning Calorimetry ◽  
High Toughness ◽  
Arylene Ether ◽  
Structure Property Relationship

Poly(arylene ether)s, poly(arylene ether imidazole)s and poly(arylene ether coimidazole)s are under investigation as part of a structure/property relationship study. The objective of this study is to identify polymers or copolymers with an attractive combination of properties for use as toughening agents for epoxies. The copolymers are being studied as possible toughness modifiers for epoxy resins because of their high glass transition temperatures, their high toughness and the ability of the active hydrogen on the imidazole moiety to react with the oxirane ring of epoxies. Homopolymers and copolymers were characterized by differential scanning calorimetry, thermal gravimetric analysis, thin-film tensile properties and neat resin flexural and toughness properties.

Synthesis and Characterization of Binuclear Indium(Ⅲ) Complexes with Bis-Schiff Bases Derived from Benzidine or its Derivatives

2011 ◽  
Vol 197-198 ◽  
pp. 627-630 ◽  
Author(s):  
Xu Dong Jin ◽  
Yue Hong Jin ◽  
Zhi Gang Cui ◽  
Yuan Yuan Li ◽  
Hai Bo Wang
Keyword(s):  
Schiff Base ◽  
Infrared Spectrum ◽  
Schiff Bases ◽  
Schiff Base Ligand ◽  
Molar Conductance ◽  
Synthesis And Characterization ◽  
Gravimetric Analysis ◽  
Thermal Gravimetric ◽  
Indium Chloride

By reactions of indium chloride tetrahydrate with three bis-Schiff bases ligands (N, N’-bis (3-methoxy-salicylidene)benzidine = L1; N, N’-bis (3-methoxysalicylidene)-2, 2’-dimethyl- benzidine =L2; N, N’-bis (3-methoxysalicylidene)-o- dianisidine = L3), respectively, three novel corresponding complexes 1~3 were obtained. The complexes were characterized by infrared spectrum, molar conductance, elemental analysis and thermal gravimetric analysis. The chemical formulae of the complexes 1~3 were determined as (InCl3)2Ln (1, n = 1; 2, n = 2; 3, n = 3). All the complexes are constructed with binuclear indium ions. Every complex consists of two central In (III) ions, one corresponding bis-Schiff base ligand and six Cl-.

Preparation and Characterization of Polymer/Multi-Walled Carbon Nanotube Nanocomposites

2008 ◽  
Vol 140 ◽  
pp. 97-102 ◽  
Author(s):  
M. Sarah Mohlala ◽  
Suprakas Sinha Ray
Keyword(s):  
Gravimetric Analysis ◽  
Melt Blending ◽  
Thermal Gravimetric ◽  
Scanning Calorimetry ◽  
Multiwalled Carbon ◽  
Nanostructured Composite ◽  
Transmission Electron ◽  
Multi Walled Carbon Nanotube ◽  
Thermal Stability Of

This paper describes the preparation, characterization and properties of nanostructured composite materials based on poly(butylene adipate-co-polycaprolactam) (PBA-co-PCL)/multiwalled carbon nanotubes (MWCNTs) and polycaprolactone (PCL)/MWCNTs. The polymer/MWCNTs nanocomposites were prepared by mixing the polymers with various amounts of MWCNTs using both solution and melt blending processes. The dispersion of MWCNTs into the polymer matrix was analyzed by transmission electron microscopy (TEM) and the thermal stability of the nanocomposites was studied by thermal gravimetric analysis (TGA). Differential scanning calorimetry (DSC) was used to study the crystallization and melting behaviour of the polymer matrices containing the MWCNTs.

Synthesis and Characterization of Ethyl Cellulose Based Acrylate

2013 ◽  
Vol 712-715 ◽  
pp. 124-130
Author(s):  
Juan Yu ◽  
Chun Peng Wang ◽  
Ji Fu Wang ◽  
Fu Xiang Chu
Keyword(s):  
Ethyl Cellulose ◽  
Gravimetric Analysis ◽  
Structure And Properties ◽  
Thermal Gravimetric ◽  
Scanning Calorimetry ◽  
H Nmr ◽  
Homogeneous Media ◽  
Acrylic Group ◽  
C Nmr

Ethyl cellulose based acrylate (AEC), an ethyl cellulose based macromonomer, was successfully synthesized by the esterificaiton reaction between ethyl cellulose and acryloyl chloride in homogeneous media and characterized by FTIR,1H NMR,13C NMR, differential scanning calorimetry (DSC) and thermal gravimetric analysis (TGA). The results showed that acrylic group was facilely grafted onto the backbone of ethyl cellulose. In addition, AEC was proved to be able to homopolymerize and copolymerize with other monomers such as butyl acrylate in the presence of free radical polymerization initiator. We believed that development of AEC together with the analysis of its structure and properties would contribute to further utilization of cellulose based materials.

Synthesis and Characterization of Hematite onto Cellulose Supports for Adsorption of Roxarsone

2019 ◽  
Vol 960 ◽  
pp. 180-193
Author(s):  
De Xu Kong ◽  
Lee D. Wilson
Keyword(s):  
Nitrogen Adsorption ◽  
Synthesis And Characterization ◽  
Gravimetric Analysis ◽  
Thermal Gravimetric ◽  
Ambient Conditions ◽  
Composite Adsorbents ◽  
Monolayer Adsorption ◽  
Cellulose Composite ◽  
Xrd And Tem

This study reports on the development of an iron oxide-cellulose composite material for the controlled removal of 4-hydroxy-3-nitrobenzenearsonic acid (roxarsone), a model organoarsenical. Hematite (He) and a hematite-cellulose (HeCell) composite adsorbents were prepared and characterized by thermal gravimetric analysis (TGA), nitrogen adsorption, and various spectroscopic (IR, Raman, XRD, and TEM) methods. The uptake of roxarsone at ambient conditions of He and HeCell, and goethite-cellulose (GoCell) adsorbent were compared to study the factors that influence adsorption. The monolayer adsorption capacity (mmol/g) of each adsorbent are listed in parentheses, as follows: cellulose (0.028), goethite (0.0730), Hematite (0.155), 10 % Fe coated GoCell (0.0222) and 10% Fe coated HeCell (0.0873). The relatively large surface area of hematite nanoparticles (NPs) and good dispersion of these NPs onto the cellulose supports contribute to their effective adsorption of roxarsone.

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