Ultrahigh molecular weight high-density

Ramasubramanian N, Krishnamurthy R, Malhotra SK. Tribological characteristics of filled ultrahigh molecular weight high density polyethylene. Wear 1993 162-164 631-5. 

Polyethylene, high density, ultra-high m.w.. See Polyethylene, ultrahigh m.w. high-density Polyethylene, high-molecular weight high-density... 

Two types of polyethylenes with high molecular weight are commercially available, namely high molecular weight high density polyethylene (HMW-HDPE) and ultrahigh molecular weight polyethylene (UHMWPE). 

Polyethylene, crystallites in, 1215 high-density, 1210 high-molecular-weight, 1210 kinds of, 1210 low-density, 1210 synthesis of, 240-241 ultrahigh-molecular-weight, 1210 uses of, 242... 

The wear behaviour of polytetrafluoroethylene (PTFE), carbon-filled PTFE, high density polyethylene (HDPE), ultrahigh molecular weight polyethylene (UHMPE), low density polyethylene (LDPE) and polymethyl methacrylate (PMMA) was studied. To ensure consistent and controlled properties of the samples, many of the materials were processed in the authors laboratory. The details of sample preparation and processing techniques are reported elsewhere ( ). ... 

Polyethylene can be made into a high-strength, high-modulus fiber (tradenamed Spectra by Allied Signal, Inc.) and then into a fabric. The polyethylene is an ultrahigh-molecular-weight polymer. The density of Spectra is the lowest of all fibers, which makes its use in aerospace laminates especially attractive. However, laminates must not be exposed to temperatures over 250°F. Spectra has very attractive electrical properties with low dielectric constant and loss factor. These properties are useful in radomes. Spectra is also used in ballistic applications like helmets and aircraft panels. 

Polyolefin materials used for the battery separator are based on a homopolymer or a blend of polyethylene (PE) and polypropylene (PP) in a number of combinations between high density polyethylene (HOPE) and ultrahigh molecular weight polyethylene (UHMWPE). The methods for manufacturing the microporous polyolefin membranes can be divided into the dry process and wet process. Both processes contain an extmsion step to produce a thin film, and employ one or more orientation steps to impart porosity and increase tensile strength. The membranes made by diy process show a distinct slit-pore microstmcmre, while those by wet process feamre interconnected spherical or elliptical pores. 

Table3.3-1 Polyethylene high-density, HDPE ultrahigh-molecular-weight, UHMWPE...

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