Mechanical-dynamic properties and structure of polyacrylic acid grafted on polypropylene

✍ Scribed by M. Pegoraro; L. Szilágyi; A. Penati; G. Alessandrini

• Publisher: Elsevier Science
• Year: 1971
• Tongue: English
• Weight: 492 KB
• Volume: 7
• Category: Article
• ISSN: 0014-3057
• DOI: 10.1016/0014-3057(71)90072-3

✦ Synopsis

The real and imaginary parts of the elastic modulus of isotactic polypropylene, polyacrylic acid and polyacrylic acid grafted on polypropylene in three different amounts (12.3, 41 and 57 per cent) were measured vs. temperature. Characteristic transitions of the two homopolymers were observed in grafted polymers. A transition at about room temperature was attributed to the fl transition of polypropylene; another transition at a higher temperature is due to the superposition of the glass transition of polyacrylic acid and of the a transition of polypropylene: the presence of polypropylene causes the glass transition of polyacrylic acid to shift toward lower temperatures.

The examined system consists of two phases, indicated also by observations with the scanning and by the transmission electronic microscopes.