4.7 Article

Unintended Rate Enhancement in Mechanochemical Kinetics by Using Poly(methyl methacrylate) Jars

Journal

CRYSTAL GROWTH & DESIGN
Volume 23, Issue 1, Pages 19-23

Publisher

AMER CHEMICAL SOC
DOI: 10.1021/acs.cgd.2c01227

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Time-resolved in situ X-ray diffraction has revolutionized the study of mechanochemical transformations, but using poly(methyl methacrylate) jars can significantly alter the kinetics of mechanochemical polymorphism, necessitating a better understanding of these effects.
Time-resolved in situ (TRIS) X-ray diffraction has changed how mechanochemical transformations are studied but requires the use of X-ray transparent jars often made from poly(methyl methacrylate) (PMMA). However, using PMMA jars can alter the apparent kinetics of mechanochemical polymorphism by an order of magnitude, questioning the interpretability of established TRIS methods. Our results suggest that rate enhancement in PMMA jars may not be dominated by chemical effects of the polymer, but rather a result of different equilibrium temperatures within the jar. These features must be better understood before control over mechanochemical reactions can be achieved.

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