The need for low-cost microfabrication technologies in modern life-sciences is described. The article compares the replication technologies, hot embossing and micro-injection moulding and gives an overview over the technologies used for fabrication of the replication masters. The back-end processes transforming the replicated plastic part into a complete microsystem are described. Some manufacturing issues of mass production are discussed.
Some liquid-crystalline polyesters (LCP) with Y-shaped mesogens, differing only in the length of their spacers, were blended with poly(ethy1ene terephthalate) (PET). Calorimetric measurements show significant influence of the LCP on the crystallization of PET even at low concentrations. The mixtures are spun into fibres and their mechanical properties are compared with fibres made from pure LCPs. The formation of LCP-fibrils leads to improved values of Young's modulus and tensile strength.
ZUSAMMENFASSUNG:Einige flussigkristalline Polyester (LCP) mit Y-formigen Mesogenen, die sich voneinander nur durch die Lange ihrer Spacer unterscheiden, wurden mit Poly(eth1enterephthalat) (PET) gemischt. Kalorimetrische Untersuchungen zeigen einen deutlichen Ein-flu8 der LCPs auf die Kristallisation des PET schon bei niedrigen Konzentrationen. Die Mischungen werden zu Fasern gesponnen, deren mechanische Eigenschaften mit denen aus den reinen LCPs verglichen werden. Die Bildung von LCP-Fibrillen fuhrt zu einer Erhohung des Elastizitatsmoduls und der Zugfestigkeiten.
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