Flexural modulus and molecular motion of PPE and PC by blending low molecular weight compounds

✍ Scribed by Atsushi Nanasawa; Shigeki Takayama; Kunihiko Takeda

• Publisher: John Wiley and Sons
• Year: 1997
• Tongue: English
• Weight: 340 KB
• Volume: 66
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/(sici)1097-4628(19971003)66:1<19::aid-app3>3.0.co;2-r

✦ Synopsis

Physical and dynamic viscoelastic properties of the blends of polyphenyleneether (PPE) and aromatic low molecular weight compounds with specific chemical structure were studied. As a result, flexural modulus increase was observed by blending aromatic phosphates, phthalic esters, or aromatic amine, which had similar chemical structure to aromatic phosphates. The observed maximum flexural modulus was 2.94 MPa, whereas PPE alone showed 2.45 MPa. There was a trend that flexural modulus increased according to the molecular weight of aromatic phosphate, though molecular weight dependence was very small for phthalic esters. By calculating the interaction between PPE chains and low molecular weight components using a molecular dynamic simulation program, it was found that there was a peculiar conformation where benzene rings interacted with methyl groups of PPE, then flexural modulus was affected as a result of this interaction. A similar conclusion was obtained by a b-dispersion shift observed by dynamic viscoelastic spectroscopy.