Synthesis and near infrared properties of rare earth ionomers

✍ Scribed by Padmavathy Rajagopalan; Andreas T. Tsatsas; William M. Risen Jr.

• Publisher: John Wiley and Sons
• Year: 1996
• Tongue: English
• Weight: 922 KB
• Volume: 34
• Category: Article
• ISSN: 0887-6266
• DOI: 10.1002/(sici)1099-0488(19960115)34:1<151::aid-polb13>3.0.co;2-d

✦ Synopsis

SYNOPSIS

Fully exchanged, anhydrous ionomers of ethylene-co-acrylic acid (EAA) copolymers and ethylene-co-methacrylic acid (EMAA) copolymers containing D Y + ~, Er+3, Sm+3, Tb+3, Tm+3, and Yb+3, and mixtures of them, were synthesized and studied in the near infrared region by reflection and Fourier Transform Laser Raman spectroscopies. The EAA copolymers ranged from 1.4 to 8.7 mol % acid and the EMAA copolymers were 7.3 and 16.2 mol % acid. The ionomers were shown to be essentially free of carboxylic acid groups, water, or other forms containing 0 -H groups and were characterized by infrared and other methods.

They are light and heat stable, and become thermoplastic and moldable at ca. 220°C under pressure. When excited a t 1.064 p with a Nd : YAG laser, these ionomers exhibit novel, lanthanide-dependent near infrared luminescence and strong Raman scattering in the near infrared region. The strongest luminescence is observed with Sm+3 ionomers. The D Y + ~ ionomer Raman-shifts this source to emit light most strongly in the 1.53-1.55 p range where the ionomer also transmits light well.