Tecoflex, polyurethane

Formation of (a) Aromatic Polyurethane, Pellethane, (b) Aromatic Polyurethane Biomer, and (c) Aliphatic Polyurethane Tecoflex... 

This approach has been used to hydrophilize the surface of the cycloaliphatic polyurethane Tecoflex which is the material used for catheter systems. Upon plasma treatment radicals are formed on the polymer surface which in contact with air react with oxygen and form hydroperoxides [ 108]. The subsequent pho-toinitiated or thermal decomposition of the hydroperoxides produces secondary radicals that are able to initiate the polymerization of suitable monomers [109] (Fig.l2). 2-Hydroxyethylmethacrylate (HEMA), hydroxybutylacrylate (HBA) or acrylic acid (AAc) can be used as hydrogel building monomers. 

Polyurethane Mw of PVB 170,000 18.5% hydroxyl content. PU Tecoflex EG-85A (from methylene bis cyclohexyl diurethane and polytetramethylene ether glycol). Extrusion blended DMA, DSC, TEM Miscible over entire composition range, due to interaction of PVB with hard segment. Single Tg, decreasing with PU content. Model compounds of the hard segment are also miscible (23)... 

Tecoflex (Trade name of Thermo Electron Corporation, USA). An aliphatic polyurethane based on HjjMDI/PTMO of 1000 molecular weight/BDO, available in three hardness grades 80 Shore A, 60 Shore D and 70 Shore D. 

Py-LVEIMS and PyHRMS were used in the determination of structure and composition of clinically important polyurethanes, PEUUs (Biomer, Lycra Spandex, Tecoflex and Pellethane) [746]. The antioxidants found in Biomer and Lycra Spandex were identified as well as an AO in Pellethane and an antistatic agent or residual catalyst in Biomer and Lycra Spandex. These tools are valuable for QC of implant material. PyMS is widely used in quality control of industrial products, such as foils and packaging materials [747], silicone and nitrile rubbers [748], can coatings and rubber sealing and tobacco [749]. In particular, it appears that Py-FIMS finds application not only for research in structure determination of non-volatile polymers, but also in product control. Schulten et al. [692] have described the application of Py-FIMS to paints (commercial can coatings), epoxy and polyester resins. Polyamides, acrylic and methacrylic resins, have been analysed in the same way [750-753], Py-FIMS is well suited for these investigations and allows identification of different polymer sub-units, such as monomers, dimers, backbone fragments, etc. Moreover, the technique enables differentiation of the examined compounds, which is of interest to industrial quality control. 

A. Testing Chamber. The blood testing chamber shown in Figure 2 consists of eight cylindrical wells machined into a Teflon block. Flat disks (22.2 mm X 3.2 mm) of the material of interest are placed in the bottom of the Teflon ports, then an inner sleeve of Tecoflex, a commercially available biocompatible polyurethane, is placed in the port to secure the disk and contain the test cell suspensions. The cylindrical sleeves were prepared by injection molding Tecoflex EG SOD purchased from Thermedics, Inc., Woburn, MA. The screw cap can be tightened with a torque wrench to a torque of 7 inch-ounces in order to provide a uniform pressure on the test disks so that distortion of the samples and leakage are minimized or prevented, respectively. Aliquots of suspensions of blood cellular constituents may be added to the chamber to assay interactions of the blood components with the test samples. 

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