Crystalline poly(alkyl methacrylates)

Abe, Hiroya; Imai, Kiyokazu; Matsumoto, M.

doi:10.1002/pol.1966.110041112

Cited by 8 publications

(1 citation statement)

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“…Moderately syndiotactic PMMA (sample 24, "atactic") was synthesized by an ordinary radical polymerization using AIBN as initiator in a 50 v/v % toluene solution at 70 °C. The syndiotactic PMMA used in this study was synthesized by a Ziegler-Natta type polymerization (sample 25) , 33 Some of the isotactic samples studied were selectively deuterated. We have no indication whatsoever that the deuteration affected the physical behavior of the polymers in any way relevant to the results reported here.…”

Section: Methodsmentioning

confidence: 99%

Thin-film behavior of poly(methyl methacrylates). 1. Monolayers at the air-water interface

Brinkhuis¹,

Schouten²

1991

Macromolecules

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The monolayer behavior of PMMA of varying tacticities at the air-water interface was studied. A difference in lateral cohesive energy is argued to be responsible for the fact that the pressure area isotherms of isotactic PMMA deviate strongly from those of syndiotactic PMMA. At low surface pressures the isotactic PMMA monolayer can be characterized as an expanded type monolayer, whereas syndiotactic PMMA forms a condensed type monolayer. At areas of about 20 AZ/monomeric unit a transition can be observed in the pressure-area isotherm of isotactic PMMA. This transition was studied as a function of molecular weight, temperature, and compression speed. From the results it is deduced that the transition corresponds to a two-dimensional pseudocrystallization process in which the isotactic PMMA assumes a double-helix conformation in the monolayer, similar to the three-dimensional crystal structure. From an Avrami analysis it is inferred that the kinetics of this crystallization can be described by an activated nucleation, followed by a one-dimensional growth.

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Section: Methodsmentioning

confidence: 99%