What is an aromatic polyester?
Like aramid, aromatic polyester fibers are highly crystalline aromatic polyester fibers, in which lots of the ester linkages (−CO−O–R–) are attached directly to aromatic rings. Vectran is a polyester-based high-performance Liquide Crystal Polymer (LCP) produced by Ticona, and its performances are listed in Table 2.60.
What is polyester liquid crystal?
A unique class of partially crystalline aromatic polyesters based on p-hydroxybenzoic acid and related monomers, liquid-crystal polymers are capable of forming regions of highly ordered structure while in the liquid phase. However, the degree of order is somewhat less than that of a regular solid crystal.
Is polyester amorphous or crystalline?
Basically, all polyester produced by DuPont Teijin Films™ (DTF) as well as other PET manufacturers, has a semi-crystalline structure. For trivial sake, the crystalline ratio for DTF polyester is roughly 60% – 40%. Crystallinity refers to the chemical structure of polymer chains.
What is LCP made of?
Liquid crystalline polymers (LCPs) are a relatively unique class of partially crystalline aromatic polyesters based on 4-hydroxybenzoic acid and related monomers shown in Fig. 6.2. Liquid crystal polymers are capable of forming regions of highly ordered structure while in the liquid phase.
What are crystalline polymers?
Crystalline polymer structure is described by a three-phase model, that is, a crystalline phase, an amorphous phase, and mesosphere (crystalline and amorphous interface). The fact is that radiation cross-linking of the crystalline polymer mainly occurs in the amorphous region.
Which type of polymer is crystalline?
Crystallinity makes a material strong, but it also makes it brittle. A completely crystalline polymer would be too brittle to be used as plastic….Amorphousness and Crystallinity.
| Some Highly Crystalline Polymers: | Some Highly Amorphous Polymers: |
|---|---|
| Syndiotactic polystyrene | Atactic polystyrene |
| Nylon | Polycarbonate |
What is LCP plate?
The Locking Compression Plate (LCP) is a new screw-plate system that offers the possibility of inserting conventional and locking head screws into the specially designed combination holes. It represents a further development of the PC-Fix and the LISS and was released for clinical application in March 2000.
What is Combi hole?
The Combi holes allow placement of conventional cortex and cancellous bone screws on one side or threaded conical locking screws on the opposite side of each hole.
What is LCP resin?
Xydar® LCP (liquid crystal polymer) is a glass fiber or mineral-filled resin that features excellent flow properties. It can be injection molded into thin-wall components and has outstanding strength at extreme temperatures to 300°C (572°F).
What is the difference between crystalline and semi-crystalline?
This makes them easy to thermoform. Because thee materials are isotropic in flow, they possess better dimensional stability than semi-crystalline plastics and are less likely to warp….The solidifying process.
| Hold Pressure | Flow through gate | |
|---|---|---|
| Semi-crystallisation | Maintain constant | Continues until end of crystallisation |
What is polymer crystallization?
Crystallization of polymers is a process associated with partial alignment of their molecular chains. These chains fold together and form ordered regions called lamellae, which compose larger spheroidal structures named spherulites.
What are different types of polyester?
The two main types of polyester are PCDT (poly-1, 4-cyclohexylene-dimethylene terephthalate) and PET (polyethylene terephthalate). PET is strong and versatile, and is the most commonly used polyester.
What are the types of polyester?
What is LC DCP plate?
The uniform stiffness of the LC-DCP allows smooth contouring of the plate to the bone. It may protect the plate from localized high bending stresses. DCP and LC-DCP System Implants are intended for temporary fixation, correction or stabilization of bones in various anatomical regions.