Polycaprolactone Density

The authors would like to thank Sam Gnaniah for determining the level of crystallinity within the polycaprolactone and Adam Calver for performing many of the density measurements. This work was funded by the United Kingdom Department of Trade and Industry as part of its programme of reseach on Materials for Processing and Performance (Project MPP 4.2 Physical Characterisation of Tissue Scaffolds). 

As compared to metallic compounds used as shape memory materials, shape memory polymers have low density, high shape recoverability, easy processability, and low cost. Since the discovery by Mitsubishi in 1988, polyurethane SMPs have attracted a great deal of attention due to their unique properties, such as a wide range of shape recovery temperatures (— 30°C to 70°C) and excellent biocompatibility, besides the usual advantages of plastics. A series of shape memory polyurethanes (SPMUs), prepared from polycaprolactone diols (PCL), 1,4-butanediol (BDO) (chain extender), and 4,4 -diphenylmethane diisocyanate (MDI) or toluene diisocyanate (TDI) have recently been introduced [200—202]. 

Dibromopropyl methacrylate Dimethyl sulfoxide Glass Glycidyl ether 100 Graphite Hexamethylenediamine Piperazine dihydrochloride Polycaprolactone Polyethylene, high-density Polyethylene, low-density... 

Unique fiber collector designs have been attempted to loosen the electrospun scaffold to improve cell infiltration. The principle of the collector design is to reduce the fiber intersections. For example, a half-ball collector containing pillars was designed to achieve cotton ball-like fibrous scaffolds by changing the fiber deposition space (Figure 19.5(a)) [22]. An ethanol bath was used as a collector to obtain low-density electrospun polycaprolactone scaffolds (Figure 19.5(b)) [23]. The ethanol quickly stabilizes the polymer fiber surface to reduce the intersections between fibers. 

Arvanitoyannis, L, Psomiadou, E., Biliaderis, C.G, Ogawa, H., Kawasaki, H. and Nakayama, O. (1997). Biodegradable films made from low density polyethylene (LDPE), ethylene acrylic acid (EAA), polycaprolactone (PLC) and wheat starch for food packaging applications Part 3. Starch-Starke, 49,306-322. 

Arvanitoyannis 1, Psomiadou E, Biliaderis CG, Ogawa H, Kawasaki N, Nakayama A. 1997. Biodegradable Films Made from Low Density Polyethylene (LDPE), Ethylene Acrylic Add (EAA), PolyCaprolactone (PCL) and Wheat Starch for Food Packaging Applications Part 3. Starch/Starke 49(7/8) 306-322. 

The depolymerase assay used in this work consisted of a densitometric assay using fine particles of polycaprolactone 300 prepared by precipitating the polymer from solution with water, and filtering the resulting suspension to remove aggregates (Jarrett, et al, 1983) The reaction mixture consisted of 1 3 ml 5mM cholate buffer (pH 7 0), 0 2 ml PCL 300 particle suspension and 1 ml of the enzyme preparation The tube was mixed and the optical density at 580 nm read at 0 time and at 5 min intervals for a minimum of 30 min Most reaction mixtures were held at room temperature except for the determination of temperature optimum Appropriate controls were followed simultaneously ... 

Low Density Polyethylene (LDPE) 9 Polycaprolactones 2-5 Low Density Polyethylene (LDPE) 9... 

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