<?xml version="1.0" encoding="UTF-8"?><xml><records><record><source-app name="Biblio" version="6.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Godinho, Maria Helena</style></author><author><style face="normal" font="default" size="100%">Borges, João Paulo</style></author><author><style face="normal" font="default" size="100%">Bordado, João Carlos</style></author><author><style face="normal" font="default" size="100%">Maria Teresa Cidade</style></author><author><style face="normal" font="default" size="100%">Martins, Assis Farinha</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Preparation and liquid-crystalline properties of toluene-4-sulphonyl urethane of hydroxypropylcellulose</style></title><secondary-title><style face="normal" font="default" size="100%">Liquid Crystals</style></secondary-title></titles><dates><year><style  face="normal" font="default" size="100%">1993</style></year></dates><urls><web-urls><url><style face="normal" font="default" size="100%">http://www.tandfonline.com/doi/abs/10.1080/02678299308027744</style></url></web-urls></urls><number><style face="normal" font="default" size="100%">3</style></number><publisher><style face="normal" font="default" size="100%">Taylor &amp; Francis</style></publisher><volume><style face="normal" font="default" size="100%">14</style></volume><pages><style face="normal" font="default" size="100%">653–659</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">&lt;p style=&quot;text-align:justify; font-size:12px; font-family:Helvetica&quot;&gt;A novel liquid-crystalline polymer, the toluene-4-sulphonyl urethane of hydroxypropylcellulose (TSUHPC), was prepared through chemical modification of hydroxypropylcellulose (HPC) of Mw = 60000 g mol−1. The resulting polymer was characterized by infrared spectroscopy, differential scanning calorimetry (DSC) and polarizing microscopy. It was found that thermotropic liquid crystal phases are formed between about 60°C and 110°C. Concentrated solutions of TSUHPC in acetone and N,N-dimethylacetamide exhibit cholesteric behaviour, at room temperature. When approaching the lyotropic mesophase to solid transition, either by cooling or by solvent evaporation, very interesting arborescent structures of a seemingly fractal nature may be observed, depending on the kinetics of the transition. A banded texture can be observed when the polymer is sheared near the transition to the isotropic phase.&lt;/p&gt;
</style></abstract><issue><style face="normal" font="default" size="100%">3</style></issue></record></records></xml>