Specific interactions and miscibility of blends of poly(ε-caprolactam) and sulfonated PEEK ionomer

✍ Scribed by Xinya Lu; R. A. Weiss

• Publisher: John Wiley and Sons
• Year: 1996
• Tongue: English
• Weight: 913 KB
• Volume: 34
• Category: Article
• ISSN: 0887-6266
• DOI: 10.1002/(sici)1099-0488(19960730)34:10<1795::aid-polb11>3.0.co;2-6

✦ Synopsis

Sulfonation of poly(oxy-1,4-phenyleneoxy-1,4-phenylenecarbonyl-l,4-phenylene), PEEK, improves its miscibility with poly(t-caprolactam), . This article describes the thermal transitions and the specific interactions that occur for blends of the free acid derivative (H-SPEEK) and the lithium (Li-SPEEK) and zinc salts (Zn-SPEEK) of sulfonated PEEK (19.2 mol % sulfonation) with N6. The interactions responsible for miscibility were characterized by Fourier transform infrared (FTIR) spectroscopy. For blends of H-SPEEK and N6, miscibility is due to hydrogen bonding between the sulfonic acid and the amide group. For blends of N6 with the salts of SPEEK the specific interaction involves a n ion-dipole complex of Li+ with the amide carbonyl or Zn2+ with the amide nitrogen. The relative strengths of the intermolecular interactions for the three types of blends increased as the cation was varied in the order: H+ < Li' < Zn2+, and the T,s of the mixtures increased in the same order.