The larger the ratio of crystals in a polymer plastic, the higher the mechanical strength, but also the greater the brittleness. Therefore a proper equilibrium between crystalline and amorphous areas is needed for obtaining useful properties of material under consideration. In addition, in many cases...
This multi-faceted situation has led to questions about size distribution and composition along with inquiries into how bulk properties of plastics change in the ocean9,10,11. Consequently, a large amount of data on physical (i.e., density, surface roughness, weight loss over time), thermal ...
Broadly, plastics can be categorized as being semicrystalline or amorphous. Understanding the implications of the structure, and specifically, the crystallinity, is important as it affects material selection, part design, processing and the ultimate anticipated service properties. Most non-polymeric ...
Molecular weight of the polymers that are used in engineering plastics affects many of the plastics properties. While it is not always known exactly what the molecular weights are, as mentioned above higher flowing plastics of a given series of products generally are lower molecular weight polymers...
Molecular weight of the polymers that are used in engineering plastics affects many of the plastics properties. While it is not always known exactly what the molecular weights are, as mentioned above, higher flowing plastics of a given series of products generally are lower molecular weight polymers...
Translation: a material with a nominal melt index of 7 g/10 min. and a density of 0.953 grams/cm3. These two numbers convey a lot of information regarding the balance of properties that can be obtained from parts molded in this material. For example, this particular selection would be ...
Despite some studies producing partial results, there has been inadequate research into the chemical composition, sources, and formation mechanisms of OA. The primary reason for this difference was the substantial variation in the physicochemical properties of OA, including its functional group composition...
Astaxanthinmolecular structurewhich contains 13 conjugated double bonds, is one kind of extremely unsteady carotenoid. 虾青素分子结构中含有13个共轭双键, 是一种极不稳定的类胡萝卜素. 互联网 The effects of materials ratios andmolecular structureon the properties of the emulsion are discussed. ...
P. Poni Institute of Macromolecular ChemistryJean-Louis Vernet & Bogdan C. SimionescuP. Poni Institute of Macromolecular ChemistryPolymer-Plastics Technology and EngineeringIoan C, Bercea M, Vernet J-L, Simionescu B. Flow prop- erties of ultrahigh-molecular-weight poly(methyl metha- crylate) in ...
Recent work has shown that certain grades of high molecular weight polyethylene have the ability to be melt-drawn to produce articles of relatively high modulus and strength; typical values are 80 GPa and 1 GPa, respectively. The source of these high mechanical properties is the unique morphology...