Electrical resistivity, polymer packaging

Polymer-matrix composites have been used as one of the most common packaging materials for encapsulating a variety of electronic components for dissipating heat [14]. In this section, 3D AlN nanowhiskers with brush-hke structure were filled into the polymer matrix to enhance its thermal conductivity. The 3D brush-hke AlN fiUers were fabricated by CS process [7a], as iUustrated in Section 3.2. The use of AlN as a filler candidate to enhance the thermal conductivity of the polymer is attributed to its attractive properties such as high thermal conductivity, high electrical resistivity, and good chemical stabihty with polymers [1]. To explore the promoting effect of the 3D brush-hke AIN fillers on thermal conductivity, three types of AIN fillers with different brush-hke filler aspect ratio were added into polymer matrix to fabricate a series of composites and their thermal conductivities were measured. The results demonstrated that the 3D brush-hke AIN nanowhiskers fillers can effectively enhance the thermal conductivity of the polymer composite. 

Polyethylene is the most common thermoplastic polymer with multiple applications insulating materials in electrical cables, pipes, packaging (bags, film, containers, a. s. o.), medical devices and other fields because of its good chemical and stress-crack resistance besides high strength. 

The polymer, like many fluorine-containing polymers has very good weathering resistance and may also be used continuously up to 150°C. Outside of the electrical field it finds use in fluid handling, in hot water piping systems, in packaging and in chemical plant. A widely used specific application for PVDF is in ultra-pure water systems for the semiconductor industry. 

Methylpentene polymer, a light plastic, has a crystalline melting point of 464 retention up to 392° F, transparency of 92%, and electrical properties similar to fluoroethylene. Its impact strength is greater than polystyrene and polymethyl methacr resistant to alkalies, weak acids, and non-chlorinated solvents. It may be injection m< implements for food packaging and preparation, medical care, and non-stick coating ... 

Vinylfluoride Polymer (Poly vinyl Fluoride), (—HgC.CHF—). A transparent solid used for prepn of films. It possesses superior resistance to chemicals and outdoor weather. The film is flexible, tough, has dielectric constant, has low permeability to air Si water a d has high resistance to heat. This polymer may serve as replacement of paints and as an outdoor protective coating for siding roof also br glazing, packaging, and electrical uses... 

Polyvinyl Fluoride Crystalline thermoplastic polymer of vinyl fluoride has good toughness, flexibility, weatherability, and low-temperature and abrasion resistance. Processed by film techniques. Used in packaging, glazing, and electrical devices. Also called PVR... 

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