The effect of the ethereal oxygen and the hydroxyl group of the side chains on the glass transition temperature and the viscoelastic characteristics of some esters of poly(methacrylic acid)

1968 ◽  
Vol 33 (10) ◽  
pp. 3197-3204 ◽  
Author(s):  
M. Ilavský ◽  
J. Hasa ◽  
J. Janáček
Keyword(s):  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Methacrylic Acid ◽  
Hydroxyl Group ◽  
Side Chains ◽  
Viscoelastic Characteristics ◽  
Ethereal Oxygen

Synthesis of Epoxy and Block Oligomer Modified Clay Nanocomposite

2001 ◽  
Vol 703 ◽  
Author(s):  
Kang Hung Chen ◽  
Sze Ming Yang
Keyword(s):  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Methacrylic Acid ◽  
Water Resistance ◽  
Clay Content ◽  
Light Transmittance ◽  
Sodium Ions ◽  
Modified Clay ◽  
Clay Layers

ABSTRACTAcrylic triblock (AxMyBz) and diblock (MyBz) oligomers containing methyl methacrylate (MMA, M), methacrylic acid (MAA, A) and dimethylaminoethyl methacrylate (DMAEMA, B) groups are intercalated into the layers of montmorillonite. The results indicate that the block oligomer lay flatly between the clay layers. ICP analyses of Na+ content indicate no unexchanged sodium ions are left in the intercalated clay.Nanocomposites of epoxy and clay modified with block oligomers were synthesized. Glass transition temperature (Tg) of the nanocomposite is 129.6°C (M18B2424+ modified clay) compared to 84.1°C for the physical mixture of epoxy and unmodified clay. Tg increases with decreasing amount of modified clay. When modified clay content are below 2 phr, Tg higher than 131.7 °C can be obtained. Water resistance and light transmittance of the nanocomposite is also improved over composite of epoxy and unmodified clay.

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