Polypropylene metallized

Frame materials inert metal polypropylene, polyethylene, poly-... 

El-Husseini MH, Venet P, Rojat G, Joubert C. Thermal simulation for geometric optimization of metallized polypropylene film capacitors. IEEE Transactions on Industry Applications 2003 38(3) 713—718. 

Metallized polypropylene (PP) is used today in many different fields such as automotive, decoration, electrical. In order to obtain a good adhesion between the aluminium and the polymer a pretreatment of the film prior to the metallization is necessary. Indeed, the very extreme surface of the polymer has to be modified in order to prepare it to a good adhesion with the metal. Thus the polymer is placed in a low pressure plasma of nitrogen with a corona discharge configuration of electrodes, and the metallization is carried out in situ after the pretreatment in nitrogen. This process, which simulates an industrial polymer film treatment has proven a great efficiency for very short treatment times (23 ms) (1).However, the mechanisms responsible for the improvement of adhesion are not totally explained yet. 

Powered sheaths have replaced the telescoping metal, polypropylene, and Teflon sheaths. There are now two powered sheaths available for clinical use for lead extraction. Powered sheaths use an energy source to cut through and vaporize the encapsulating fibrous scar that has grown around the endocardial lead. The first commercially available and FDA approved power sheath is the Spectranetics excimer laser sheath. The second and more recently available is the Cook Vascular Electrosurgical Dissection Sheath. The powered sheaths are available in multiple sizes between 12 and 16 French (Fig. 6.9). The power sheaths are also complemented with outer Teflon sheaths for counterpressure and countertraction. 

Rabuffi M, Picci G (2002) Status quo and future prospects for metallized polypropylene energy storage capacitors. IEEE Trans Plasma Sci 30 1939... 

Outstanding adhesion to polar substrates, metal, polypropylene, and olefinic based elastomers during insert molding, extrusion coating, and powder coating. 

Yializis, A., Ellwanger, R.E., Harvey, J., "Barrier Degradation in Aluminum Metallized Polypropylene Films," Proceedings of the 40th Annual Technical Conference of the Society of Vacuum Coaters (97), pp371-375... 

The actuator contains the final orifice and a finger pad or mechanical linkage for on—off control. The spray pattern is largely affected by the constmction of the actuator, particularly by the chamber preceding the orifice. Actuators are often termed mechanical breakup and nonmechanical breakup depending upon the complexity of this chamber. Mechanical breakup actuators are of more expensive two-piece constmction. Actuators are usually molded from polyethylene or polypropylene the breakup insert may be almost any material, including metal. 

Corrosion. Ammonium bifluoride dissolves in aqueous solutions to yield the acidic bifluoride ion the pH of a 5% solution is 3.5. In most cases, NH4HF2 solutions react readily with surface oxide coatings on metals thus NH4HF2 is used in pickling solutions (see Metal surface treatments). Many plastics, such as polyethylene, polypropylene, unplasticized PVC, and carbon brick, are resistant to attack by ammonium bifluoride. 

Structural Components. In most appHcations stmctural foam parts are used as direct replacements for wood, metals, or soHd plastics and find wide acceptance in appHances, automobUes, furniture, materials-handling equipment, and in constmction. Use in the huil ding and constmction industry account for more than one-half of the total volume of stmctural foam appHcations. High impact polystyrene is the most widely used stmctural foam, foUowed by polypropylene, high density polyethylene, and poly(vinyl chloride). The constmction industry offers the greatest growth potential for ceUular plastics. 

Polyester and polypropylene films have been laminated (ca 1991) to base steel sheet to impart protection to the metal. These laminated metals are used to make two-piece drawn cans. 

A typical automobile battery weighs 16.4 kg and consists of 3.5 kg metallic lead, 2.6 kg lead oxides, 4.0 kg lead sulfate, 1.3 kg polypropylene, 1.1 kg PVC, mbber and other separators, and 3.9 kg electrolyte. Including acid and water, the lead-beating parts represent 61 wt %, ie, 21 wt % of lead alloy (2% Sb) and 40 wt % lead oxides and sulfate. Nonlead-beating parts constitute the remaining 39% the case (hard mbber or polypropylene) and separators (PVC) at 15 wt % and the electrolyte at 24 wt %. 

---