scholarly journals Synthesis, Characterization and Glass - Reinforced Composites of Thiourea - Formaldehyde - Phenol Resin

2004 ◽  
Vol 1 (5) ◽  
pp. 256-262 ◽  
Author(s):  
Kanuprasad Dahyalal Patel ◽  
Dhirubhai J. Desai ◽  
Manish M. Morekar ◽  
Yogesh Shrikant Tilak
Keyword(s):  
Molecular Weight ◽  
Differential Scanning Calorimetry ◽  
Average Molecular Weight ◽  
Conductometric Titration ◽  
Spectral Studies ◽  
Reinforced Composites ◽  
Number Average Molecular Weight ◽  
Scanning Calorimetry ◽  
Alcoholic Alkali ◽  
Glass Reinforced Composites

N,N'-Dimethylol thiourea-formaldehyde (DMTUF) resin having the methylol group (CH2OH) has been prepared and characterized. The condensation of DMTUF resin with Phenol (P) was carried out in the presence of alcoholic alkali catalyst at varying ratios of DMTUF: P, namely 1:1, 1:1.5 and 1:2. The resultant DMTUFP resin was characterized by elemental analysis, IR spectral studies, number average molecular weight (M¯n) estimated by non-aqueous conductometric titration, and thermo gravimetry. The curing study of DMTUFP resin with hexamethylene tetramine (HMTA) was monitored by differential scanning calorimetry (DSC) and kinetic parameters were evaluated. Glass-reinforced composites based on the DMTUFP-HMTA system have also been prepared and characterized.

Synthesis, Characterization and Glass-Reinforced Composites of Acetone–Formaldehyde–Phenol Resins

1997 ◽  
Vol 9 (2) ◽  
pp. 153-160 ◽  
Author(s):  
Hasmukh S Patel ◽  
Bharat C Dixit
Keyword(s):  
Molecular Weight ◽  
Differential Scanning Calorimetry ◽  
Average Molecular Weight ◽  
Conductometric Titration ◽  
Spectral Studies ◽  
Reinforced Composites ◽  
Number Average Molecular Weight ◽  
Scanning Calorimetry ◽  
Alcoholic Alkali ◽  
Glass Reinforced Composites

Acetone–formaldehyde (AF) resin having the methylol group (–CH2OH) has been prepared and characterized. The condensation of AF resin with phenol (P) was carried out in the presence of alcoholic alkali catalyst at varying ratios of AF:P, namely 1:1, 1:1.5 and 1:2. The resultant AFP resins were characterized by elemental analysis, IR spectral studies, number average molecular weight ( Mn) estimated by non-aqueous conductometric titration, and thermogravimetry. The curing study of AFP resins with hexamethylene tetramine (HMTA) was monitored by differential scanning calorimetry (DSC) and kinetic parameters were evaluated. Glass-reinforced composites based on the AFP–HMTA system have also been prepared and characterized.

scholarly journals Synthesis, Characterization and Glass - Reinforced Composites of N,N'-Dimethylolthiourea – m-Aminophenol Resin

2005 ◽  
Vol 2 (2) ◽  
pp. 136-141
Author(s):  
K. D. Patel ◽  
M. M. Morekar ◽  
Y. S. Tilak
Keyword(s):  
Molecular Weight ◽  
Differential Scanning Calorimetry ◽  
Average Molecular Weight ◽  
Conductometric Titration ◽  
Spectral Studies ◽  
Reinforced Composites ◽  
Number Average Molecular Weight ◽  
Scanning Calorimetry ◽  
Alcoholic Alkali ◽  
Glass Reinforced Composites

N,N’-Dimethylolthiourea (DMTU) resin having the methylol group ( –CH2OH ) has been prepared and characterized. The condensation of DMTU resin with m-aminophenol was carried out in the presence of alcoholic alkali catalyst at varying ratios of DMTU: mAP, namely 1:1, 1:1.5 and 1:2. The resultant DMTUmAP resin was characterized by elemental analysis, IR spectral studies, number average molecular weight (M¯n) estimated by non-aqueous conductometric titration, and thermogravimetry. The curing study of DMTUmAP resin with hexamethylenetetramine (HMTA) was monitored by differential scanning calorimetry (DSC) and kinetic parameters were evaluated. Glass-reinforced composites based on the DMTUmAP-HMTA system have also been prepared and characterized.

Novel Bismaleimide–Epoxy Resin System: II

1996 ◽  
Vol 8 (2) ◽  
pp. 233-242
Author(s):  
Hasmukh S Patel ◽  
Sanket N Shah
Keyword(s):  
Epoxy Resin ◽  
Average Molecular Weight ◽  
Conductometric Titration ◽  
Diglycidyl Ether ◽  
Spectral Studies ◽  
Reinforced Composites ◽  
Resin System ◽  
Number Average Molecular Weight ◽  
Scanning Calorimetry ◽  
Epoxy Resin System

Novel diamines, namely N, N′-bis[1-(2-methyl-4-aminophenyl)ethanonyl]-1,4- benzenediamine (BMAED 1) and N, N′-bis[1-(4-methyl-3-animophenyl)ethanonyl]-1,4-benzenediamine (BMAED 2), have been prepared and reacted with various bismaleimides (BM) at a BM:diamine ratio of 1:2. The resulting oligoimides have been characterized by elemental analysis, IR spectral studies and the number average molecular weight ( Mn) estimated by non-aqueous conductometric titration and thermogravimetry. Some of the oligomides have been modified by addition (i.e. curing reaction) of epoxy resin, namely the diglycidyl ether of bisphenol-A, and studied by differential scanning calorimetry (DSC). The glass- and carbon-reinforced composites have also been prepared and characterized by their mechanical properties.

Novel Epoxy Resin—Part 2

1996 ◽  
Vol 8 (2) ◽  
pp. 301-305
Author(s):  
K D Patel
Keyword(s):  
Differential Scanning Calorimetry ◽  
Thermogravimetric Analysis ◽  
Epoxy Resin ◽  
Diglycidyl Ether ◽  
Spectral Studies ◽  
Reinforced Composites ◽  
Scanning Calorimetry ◽  
Resin Part ◽  
Glass Reinforced Composites

A novel epoxy resin, namely diglycidyl ether (DGE) of 2,4-dihydroxyacetophenone (i.e. resacetophenone, RAP) was prepared and characterized. The curing of DGE–RAP by various diamines was studied kinetically by differential scanning calorimetry (DSC). The cured neat products have been characterized by IR spectral studies and thermogravimetric analysis (TGA). The glass-reinforced composites based on such a novel epoxy resin–diamine system have also been prepared and characterized.

Communication

1997 ◽  
Vol 9 (4) ◽  
pp. 457-460
Author(s):  
K B Patel ◽  
K R Desai ◽  
H S Patelk
Keyword(s):  
Molecular Weight ◽  
Electrical Properties ◽  
Room Temperature ◽  
Average Molecular Weight ◽  
Conductometric Titration ◽  
Spectral Studies ◽  
Number Average Molecular Weight ◽  
Elemental Analyses

Four various poly(urethane-urea)s (PUUs) were prepared by polycondensation of 3-aminophenol with various diisocyanates. The resultant poly(urethane-urea)s were characterized by elemental analyses, IR spectral studies, number average molecular weight ( Mn) estimated by non-aqueous conductometric titration and thermogravimetry. The electrical properties of these polymers have also been measured at room temperature.

scholarly journals Synthesis and Characterization of Colored Polyureas

2004 ◽  
Vol 1 (1) ◽  
pp. 51-56 ◽  
Author(s):  
M. G. Patel ◽  
K. R. Desai ◽  
H. S. Patel
Keyword(s):  
Electrical Conductivity ◽  
Molecular Weight ◽  
Room Temperature ◽  
Average Molecular Weight ◽  
Conductometric Titration ◽  
Spectral Studies ◽  
Synthesis And Characterization ◽  
Disperse Dyes ◽  
Number Average Molecular Weight

Various disperse dyes based onm-phenylenediamine have been prepared. These dyes then polycondensation with 4,4'-Diphenyl methane diisocyanate. The resultant colored polyureas were characterized by N content, IR spectral studies, Number Average Molecular Weight (Mn) estimation by nonaqueous conductometric titration and thermogravimetry. All the polyureas were subjected to measure electrical conductivity at room temperature.

Poly(Amido-Imide)s Based on Amino-Terminated Oligoimides

1997 ◽  
Vol 9 (1) ◽  
pp. 33-39 ◽  
Author(s):  
Hasmukh S Patel ◽  
Nilesh P Patel
Keyword(s):  
Epoxy Resin ◽  
Addition Reaction ◽  
Average Molecular Weight ◽  
Conductometric Titration ◽  
Diglycidyl Ether ◽  
Spectral Studies ◽  
Michael Addition Reaction ◽  
Scanning Calorimetry ◽  
Epoxy Resin System ◽  
Cure Temperature

An amino-terminated oligoimide was prepared by Michael addition reaction of N, N′-1, 4-phenylene bismaleimide (PBM) and 4, 4′-diamino-diphenyl methane (DDM) at a PBM–DDM ratio of 1:2. The poly(amido-imide)s (PAIs) were prepared by condensation of this PBM–DDM oligoimide with various aliphatic bisesters. The resultant PAIs were characterized by elemental analysis, IR spectral studies, number-average molecular weight ( Mn), estimated by nonaqueous conductometric titration, and thermogravimetry. The curing reaction of the epoxy resin–, namely diglycidyl ether of bisphenol-A (DGEBA)–, PAI system was monitored by differential scanning calorimetry (DSC). Based on cure temperature, the glass- and carbon-fibrereinforced composites (i.e. laminates) of the PAI–epoxy resin system have also been prepared and characterized.

Physicochemical study of complexation and ion-exchange properties of 2-hydroxy-4-ethoxypropiophenone—ethylene glycol polymer

1994 ◽  
Vol 6 (2) ◽  
pp. 123-132 ◽  
Author(s):  
Jayesh R Patel ◽  
Dipan H Sutaria ◽  
Magan N Patel
Keyword(s):  
Molecular Weight ◽  
Ion Exchange ◽  
Ethylene Glycol ◽  
Polyphosphoric Acid ◽  
Average Molecular Weight ◽  
Thermal Studies ◽  
Conductometric Titration ◽  
Number Average Molecular Weight ◽  
Elemental Analyses ◽  
Exchange Properties

Copolymers (HEPP-EG) were synthesized by the condensation of 2-hydroxy-4-ethoxypropiophenone with ethylene glycol in presence of polyphosphoric acid as a catalyst. The copolymers were characterized by elemental analyses, IR spectra, viscosity and thermal studies. The number-average molecular weight (Mn) was measured by non-aqueous conductometric titration. The copolymer HEPP-EG-6 was complexed with metal ions, Cu2+, Ni2+, Co2, Mn2+ and Zn2+ and characterized. Chelation ion-exchange properties have been studied by employing the batch equilibration method.

Synthesis and characterization of poly(coumarin-urethane)s

1994 ◽  
Vol 6 (3) ◽  
pp. 257-262
Author(s):  
D I Brahmbbatt ◽  
L Jayabalan ◽  
Harshad D Patel
Keyword(s):  
Molecular Weight ◽  
Elemental Analysis ◽  
Vapour Pressure ◽  
Condensation Reaction ◽  
Average Molecular Weight ◽  
Spectral Studies ◽  
Synthesis And Characterization ◽  
Molecular Weight Determination ◽  
Number Average Molecular Weight

Poly(coumarin-urethane)s (PCUs) were prepared by the condensation reaction of 3,3'-dihydroxy-6,6'-methylcnebiscoumarin (DHMBC) with various diisocyanates. All the poly(coumarin-urethane)s were characterized by elemental analysis, IR spectral studies, number average molecular weight determination (by vapour pressure osmometry), viscosity studies and thermogravimetry.

Epoxy-modified polyimides: part I

1993 ◽  
Vol 5 (2) ◽  
pp. 145-153 ◽  
Author(s):  
Hasmukh S Patel ◽  
Vipul J Shah
Keyword(s):  
Average Molecular Weight ◽  
Conductometric Titration ◽  
Diglycidyl Ether ◽  
Spectral Studies ◽  
Scanning Calorimetry ◽  
Molar Ratios ◽  
Preliminary Study ◽  
Glass Reinforcement ◽  
The Michael Addition ◽  
Cure Epoxy Resin

The Michael addition reaction of N,N'-l,4-phenylene bis(maleimide) (PBM) with 4,4'-diamino diphenyl methane (DDM) at 1:1, 1: 1.5 and 1:2 molar ratios was carried out in melt at 125-130'C. The resultant polyimide oligomers (PBM-DDM) were characterized by elemental analysis, number of amino and imino groups, IR spectral studies, number average molecular weight, by non-aqueous conductometric titration, and thermogravimetry. These polyimide oligomers were used to cure epoxy resin, namely diglycidyl ether of bisphenol-A, and studied by differential scanning calorimetry (DSC). The unreinforced PBM-DDM epoxy-cured products have also been prepared and characterized. A preliminary study of glass reinforcement based on the PBM-DDM epoxy system has also been established.

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