Tekočekristalni elastomeri

Povzetek

Ključne besede

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Jezik:	Slovenski jezik
Leto izida:	2011
Izvor:	Ljubljana
Tipologija:	2.11 - Diplomsko delo
Organizacija:	UL PEF - Pedagoška fakulteta
Založnik:	[M. Žebovec]
UDK:	532.783(043.2)
COBISS:	8954441
Št. ogledov:	1216
Št. prenosov:	223
Ocena:	0 (0 glasov)
Metapodatki:

Ostali podatki

Sekundarni jezik:	Angleški jezik
Sekundarni naslov:	Liquid crystal elastomers
Sekundarni povzetek:	The graduation work presents liquid crystal elastomers (LCE), which are made from liqid crystals and elastomers. Their main microscopic properties are orientation, positional order and the smectic order to the layer normal. We see these properties as different phase of the same matter. We can find them not only in crystal and liquid phase but in phases between those: in liquid crystal phases. Liquid crystal may flow, drip and they take a shape like a liquid, but they are similar to crystals because its molecules may be oriented in a crystal-like way. Elastomers are made from polymeric chains, which form an elastomeric net. That gives them macroscopic properties like shape and deformation. If we act with force on them they stretch in the direction in which they are being pulled. When a deforming force is removed, they resume their original shape, if the force is not too strong. LCE have properties of both. Their very interesting property is thermomechanical response. The liquid crystals in them go with heating from nematic phase into izotropic phase. LCE are in the direction of director in nematic phase longer than in isotropic. We explored how the crosslinking density affect the isotopic to smectic A phase transition. We used two samples with different crosslinking density. Both samples exhibit first order I-SmA phase transitions. By changing the crosslinking density the anomaly of heat capacity and with that thermomechanical response is widened. We made a mechanical model, which we can use at school, with intention to introduce children what are LCE and their thermomechanical response.
Sekundarne ključne besede:	physics;fizika;
Vrsta datoteke:	application/pdf
Vrsta dela (COBISS):	Diplomsko delo
Strani:	62 str.
Vrsta dela (ePrints):	thesis
Naslov (ePrints):	Tekočekristalni elastomeri
Ključne besede (ePrints):	tekoči kristali;elastomeri;tekočekristalni elastomeri;
ID:	8308343