ISSN:
1436-2449
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
,
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
,
Physics
Notes:
Summary The synthesis and determination of virtual mesomorphic phase transitions of the polyether based on l-(4-hydroxyphenyl)-2-(2-methyl-4-hydroxyphenyl) ethane (MBPE) and 1,14-dibromotetradecane (MBPE-14) and of the copolyethers based on MBPE and 1,14-dibromotetradecane with 1,5-dibromopentane (MBPE-5/14), 1,8-dibromooctane (MBPE-8/14) and 1,9-dibromononane (MBPE-9/14) are presented. The homopolymer MBPE-14 is only crystalline, while the copolymers display a monotropic (MBPE-5/14 and MBPE-9/14) or even an enantiotropic (MBPE-8/14) nematic mesophase. The averaged virtual isotropicnematic transition temperature of MBPE-14 determined from these copolymers is 87 ± 7 °C (ΔH=2.77±0.21 kcal/mru).
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00718925
