Synthesis and unperturbed dimensions of poly(diphenylmethyl methacrylate)

✍ Scribed by Jimmy W. Mays; Nikos Hadjichristidis; J. S. Lindner

• Publisher: John Wiley and Sons
• Year: 1990
• Tongue: English
• Weight: 449 KB
• Volume: 28
• Category: Article
• ISSN: 0887-6266
• DOI: 10.1002/polb.1990.090281101

✦ Synopsis

Abstract

The synthesis, fractionation, and characterization of poly(diphenylmethyl methacrylate) (PDPMM) are described. Analysis of tacticity by ^13^C nuclear magnetic resonance (NMR) revealed a high (25%) isotactic content. Results of low‐angle light scattering and intrinsic viscosity measurements in toluene indicate that PDPMM chains behave as random coils and that toluene is a thermodynamically good solvent. The characteristic ratio C~∞~ of the chains was determined from viscosity measurements in a near‐theta solvent, 3‐heptanone at 45°C. The corresponding value of C~∞~ = 14.0 is consistent with previous work on poly(triphenylmethyl methacrylate), C~∞~ = 20.3, and poly(benzyl methacrylate), C~∞~ = 10.0, and reflects the bulkiness of the side group and the increase in isotactic content of the chains with increasing substitution.