Viscosities of dilute solutions of poly(tetrahydrofurfuryl methacrylate)

Abstract

S U M M A R Y := 6,13.105) of poly(tetrahydrofurfury1 methacrylate) in eleven solvents at temperatures between 30°C and 50°C show the following order: tetrachloroethane > dichloroethane > tetrahydrofuran > chloroform > benzene > bromobenzene > ethyl acetate > carbon tetrachloride > methyl pentyl ketone > acetone > 2-hydroxymethyltetrahydrofuran. Values of HUGCINS slope constants range between 0,34 to 0,48 for the unfractionated polymer and the magnitudes of a and k in the expression [ q ] = k M " show little variations with temperature in case of good solvents whereas the opposite is observed in case of poor solvents. The theta temperature for 2-hydroxymethyltetrahydrofuran containing 20 % methanol is 31,2 t 0,3"C and 3,49, 5,72, and 4,97 are the values for KO .lo4, (2/M)1'2.109 and (~~2)1'2~108, respectively. Z U S A M M E N F A S S U N G : Die Viskositatszahlen von sieben Fraktionen (mn = zwischen 1,69 .lo5 und 6,13.105) von Poly(tetrahydrofurfurylmethacry1at) in elf Losungsmitteln zwischen 30" und 5OoC weisen die nachstehende Reihenfolge auf: Tetrachlorathan > Dichlorathan > Tetrahydrofuran > Chloroform > Benzol > Brombenzol > Athylacetat > Tetrachlorkohlenstoff >Methylpentylketon > Aceton > 2-Hydroxymethyltetrahydrofuran. Die Werte der HUCCINsschen Konstanten fur unfraktionierte Polymere liegen zwischen 0,34 und 0,48. In guten Losungsmitteln zeigen die in der Beziehung [ q ] = kM" auftretende Werte von a und k nur geringe Anderungen mit der Temperatur, die sich jedoch in schlechten Losungsmitteln bemerkbar machen. Die Thetatemperatur fur 20 % Methanol enthaltendes 2-Hydroxymethyltetrahydrofuran ist 31,2 5 0,3'C. Ko.104; (~/ M ) 1 ' Z . 1 0 9 bzw. (~~/Z)''z.108 haben die Werte 3,49, 5,72 bzw. 4,97.

Solution properties, unperturbed dimensions, and chain flexibility of poly(1‐adamantyl acrylate)

“…However, the thermal properties of PAdA are outstanding and even superior to polymethacrylates like PMMA and PTHFMA, due to 1‐adamantyl group's unique compact structure (diamond lattice and bridged nature). PAdA has a T g that is higher than that of PS (100 °C) and a characteristic ratio that is essentially identical to that of PS . The adamantyl group is bulkier than the phenyl group but the closer proximity of the phenyl group to the polymer backbone in the case of PS results in equivalent hindrances to rotation about backbone bonds.…”

“…PAdA has a T g that is higher than that of PS (100 8C) and a characteristic ratio that is essentially identical to that of PS. 34 The adamantyl group is bulkier than the phenyl group but the closer proximity of the phenyl group to the polymer backbone in the case of PS results in equivalent hindrances to rotation about backbone bonds.…”