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   in situ generation of ammonia: an efficient catalyst for the synthesis of phenol-aniline-formaldehyde resol resins  
   
نویسنده wale apparav ,mulani khudbudin ,donde kamini ,ponrathnam surendra ,chavan nayaku
منبع advanced journal of chemistry-section a - 2020 - دوره : 3 - شماره : 2 - صفحه:146 -158
چکیده    a novel method developed for the synthesis of resol based phenol-anilineformaldehyde (paf) resins by in situ generation of ammonia using magnesium hydroxide and ammonium chloride as reagents in the presence of phenol, aniline and formaldehyde. the synthesized paf resol resins were characterized by ir, nmr spectroscopic methods, thermal stability by thermogravimetric analysis (tga) and thermal properties by differential scanning colorimerty (dsc). free phenol and free aniline of paf resins were determined using gas chromatography and also these resins characterized for elemental analysis, inherent viscosity, molecular weight and gel time. dsc results illustrated that the glass transition temperatures of paf resins exhibited in the range of 72-110 °c, whereas tga results depicted that the thermal stability of the paf resins revealed in the range of 516-548 °c. in situ generation of ammonia showed higher thermal stability and lower content of free phenol and free aniline in paf resin.
کلیدواژه phenol-aniline-formaldehyde resins ,in-situ ,ammonia ,resol ,thermal properties
آدرس national chemical laboratory, chemical engineering and process development division, india, ramnarain ruia college, department of chemistry, india, ramnarain ruia college, department of chemistry, india, national chemical laboratory, chemical engineering and process development division, india, national chemical laboratory, chemical engineering and process development division, india
پست الکترونیکی nn.chavan@ncl.res.in
 
 

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