Effects of inorganic oxides on polymer binder burnout. II. Poly(butyl methacrylate)

✍ Scribed by Aurobindo Nair; Robert L. White

• Book ID: 102655012
• Publisher: John Wiley and Sons
• Year: 1996
• Tongue: English
• Weight: 781 KB
• Volume: 60
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/(sici)1097-4628(19960613)60:11<1911::aid-app15>3.0.co;2-3

✦ Synopsis

The effects of silica, mullite, a-alumina, and y-alumina on the nonoxidative thermal degradation of poly(buty1 methacrylate) are described. Under conditions similar to those employed for nonoxidative ceramic sintering, more volatile alkyl aromatic species were detected when polymer/oxide samples were heated than when the neat polymer was heated. Relative to the neat polymer, all of the inorganic oxides inhibited monomer evolution and promoted an ester decomposition reaction that yielded butene. Infrared analysis indicated that poly(methacry1ic acid) segments resulting from ester decomposition reacted to form anhydride. The presence of water vapor during the thermal degradation of the neat polymer and polymer/oxide samples lowered the temperatures at which monomer evolution maximized but had little effect on butene evolution. When the polymer was coated on y-alumina, significant amounts of carboxylate were formed above 400°C as a result of deprotonating poly(methacry1ic acid) functionalities on the y-alumina surface.