Next generation dry strength additives: Leveraging on-site synthesis  to develop high performance  glyoxalated polyacrylamides, TAPPI Journal January 2024

 


Application: There is a distinct lack of fundamental structure function relationships for gPAMs in the literature. This work hopes to shed light on the interaction between prepolymer characteristics and glyoxalation conditions, and how optimizing both parts can lead to a high-performance material.

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Author: Anthony J. Petty II, Matthew Wright, and Sachin Borkar
Next generation dry strength additives: Leveraging on-site s
ABSTRACT: Although glyoxalated polyacrylamides (gPAMs) have been described since the 1950s, the freedom to design new materials based on this chemistry has been limited by practical concerns; namely, a balance between solution concentration and material characteristics must be met to make the economics of gPAM strength additives work for the paper industry. For traditional “delivered” gPAMs, only a very narrow range of polyacrylamide molecular weights and compositions could be considered for glyoxalation. However, the development and successful implementation of automated reactor equipment that allows for the synthesis of gPAMs from glyoxal and polyacrylamide copolymers at the mill, known as “on-site” glyoxalation, obviates the shipping and stability concerns that have traditionally held back gPAM development. As such, on-site generators represent a platform that enables the glyoxalation of materials that would otherwise not have been suitable for use in a traditionally delivered gPAM product. These on-site generators therefore open new avenues for polymer design to allow for the creation of the next generation of strength additives. By leveraging the synthetic freedom of the on-site generators, a suite of high performance gPAMs has been designed, yielding materials that provide both exceptional strength and drainage performance in poor quality furnishes.
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