Differential scanning calorimetry and thermogravimetry studies of polyacrylamide prepared by free-radical polymerization in inverse microemulsion and in solution

✍ Scribed by Ivica Janigová; Katarína Csomorová; Martina Stillhammerová; Jaroslav Bartoň

• Publisher: John Wiley and Sons
• Year: 1994
• Tongue: English
• Weight: 320 KB
• Volume: 195
• Category: Article
• ISSN: 1022-1352
• DOI: 10.1002/macp.1994.021951108

✦ Synopsis

Abstract

In spite of the free‐radical polymerization of acrylamide in different reaction environments (non‐percolating (A) and/or percolating (B) inverse microemulsions, water/isopropanol solution (C)) the polyacrylamides obtained did not differ in their T~g~ values (A: 468 K; B: 469 K; C: 468 K). Similarly, the course of thermogravimetry curves for all three samples A, B and C, was practically identical. The results confirmed that the spatially oriented array of acrylamide molecules at the water/oil interface of the inverse micellar system was destroyed already at early stages of polymerization. The formation of longer polymer chains due to the polymerization at water/oil interface was thus restricted or even eliminated in favor of the propagation of polyacrylamide growing chains in isotropic conditions of water pools of inverse micelles.