Abstract
ORD and UV measurements were carried out on poly[(+)-2-methyl-butyl methacrylate]s (PMBMA) with various tacticities and on the monomeric analogue.Specific rotation ([α], measured between 400 and 250 m μ) of isotactic (i-) PMBMA is larger and that of atactic (a)PMBMA is smaller than that of the monomeric analogue at room temperature. Extinction coefficient (k, measured at 217 mμ) of i-PMBMA is larger than that of α-PMBMA. The monomeric analogue showed the lowest absorption.Specific rotation of i-PMBMA and the monomeric analogue decreases, while that of a-PMBMA increases with increasing temperature. Values of the temperature coefficient of [α], Δ[α]/[α]ΔT, of these three samples are of the order of 10−3. In the case of n-heptane and dioxane solutions, the absolute value of Δ[α]/[α]ΔT each sample measured between 60 and 70°C is smaller than that obtained between 50 and 60°C.The extinction coefficient of these samples decreases with temperature and the relative temperature effects of k, Δk/kΔT, are of the order of 10−3. The absolute value of Δk/kΔT of i-PMBMA is greater, but that of a-PMBMA and the monomeric analogue is smaller in the high temperature range (60 to 70°C) than in the low temperature range (30 to 40°C).The significant differences observed in a series of optical behavior may arise from the differences in the electronic perturbation of chromophores originating from con-formational differences (including the conformation of -COO groups) in the very local parts of the polymer chain.
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Ohara, K. Optical Rotatory Dispersion and Ultraviolet Spectrum Studies of Poly[(+)-2-methylbutyl methacrylate] and Monomeric Analogue. Polym J 2, 109–116 (1971). https://doi.org/10.1295/polymj.2.109
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DOI: https://doi.org/10.1295/polymj.2.109