Abstract

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 ( ) 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.

Highlights

  • The study of N,N'-Dimethylol thiourea-formaldehyde (DMTUF) resinification is well established.1-7 The DMTUF resin, having two CH2OH groups, have found many applications, for example in corrosion protection of building materials and metallic surfaces, polymerisation accelerators, decolourating hair, flame resistant agent, coating, gelling agent, cross-linking agents, adhesives, binders, finishing agents, insect proofing in textiles.8-20 Like resol such resin may afford condensation with phenolic derivatives

  • It was thought interesting to explore the field of DMTUF- Phenol (DMTUFP) condensation

  • Synthesis of Dimethylol thiourea-formaldehyde (DMTUF) resin These were prepared by slight modification of the method reported

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Summary

Introduction

The study of N,N'-Dimethylol thiourea-formaldehyde (DMTUF) resinification is well established. The DMTUF resin, having two CH2OH groups, have found many applications, for example in corrosion protection of building materials and metallic surfaces, polymerisation accelerators, decolourating hair, flame resistant agent, coating, gelling agent, cross-linking agents, adhesives, binders, finishing agents, insect proofing in textiles. Like resol (having CH2OH self-curable groups) such resin The study of N,N'-Dimethylol thiourea-formaldehyde (DMTUF) resinification is well established.. The present communication comprises the synthesis, characterization of DMTUF resin and its postreaction with phenol. The resulting resin was studied for their curing characteristic with hexamethylenetetramine (HMTA) on DSC. Synthesis of Dimethylol thiourea-formaldehyde (DMTUF) resin These were prepared by slight modification of the method reported.. The so-called resin obtained was in the form of colourless thick liquid. It was neutralized by acetic acid and dried azeotropically. The resin prepared, was with a slight modification reported [21]. The supernatant aqueous layer was decanted and the resultant resin was washed with large amount of distilled water to remove unreacted material.

Composite fabrication
Alcoholic KOH
Elemental Analysis
Findings
Flexural Impact Specific strength strength Rockwell
Full Text
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