How does residual stress manifest in polymers? Knowing how residual stresses manifest themselves in crystalline materials? Polymers As defined by the Oxford Dictionary, a substance that has a molecular structure consisting chiefly or entirely of a large nu...
Materials that are firmly bonded together with epoxy and other tough adhesives are ubiquitous in modern life?from crowns on teeth to modern composites used in construction. Yet it has proved remarkably difficult to study how these bonds fracture and fail, and how to make them more resistant to ...
Plastics are entirely different. Although often solid, they don't have the same crystalline structure. Their molecules (which are typically very long, repetitive chains called polymers) are bonded together in such a way that the electrons inside the atoms are fully occupied. There are, in short...
Molecules are composed of atoms that have bonded and released the extra energy with them as bond formation energy. This bond can either be ionic or covalent. It is formed whennitrogen of NH3 donates its lone pair of electrons into empty orbital of boron in BF3. ...
What is the qualitative difference between nylon rope polymer and SLIME (hydrogen bonded)? How are alloys produced? Why is sebacic chloride converted to sebacoyl chloride to make nylon polymer? Explain the differences observed in the Tg and Tm values for each pair of polymers: (a) polyester A...
The manufacture of polyester, which is used to make twill nearly as frequently as cotton, is inherently bad for the environment. This fabric is made from petroleum, which is a non-renewable resource, and a number of toxic chemicals are used to extract usable polymers from this "fossil fuel"...
Pawlak, A. The entanglements of macromolecules and their influence on the properties of polymers. Macromol. Chem. Phys. 220, 1900043 (2019). Article Google Scholar Sułkowska, J. I., Sułkowski, P. & Onuchic, J. Dodging the crisis of folding proteins with knots. Proc. Natl Acad. Sc...
Pawlak, A. The entanglements of macromolecules and their influence on the properties of polymers. Macromol. Chem. Phys. 220, 1900043 (2019). Article Google Scholar Sułkowska, J. I., Sułkowski, P. & Onuchic, J. Dodging the crisis of folding proteins with knots. Proc. Natl Acad. Sc...
What are proteins with covalently-bonded carbohydratesproteins with covalently-bonded carbohydrates? What are the main differences between a monosaccharide and a disaccharide? How do enzymes interact with their specific substrate molecules? If proteins are all polymers of amino acids, then how can differe...
The impact strengths of some common polymers are shown in Table 1 below: Table 1: Impact Strengths of Some Common Polymers PolymerMin IZOD value (J/m2)Max IZOD value (J/m2) ABS - Acrylonitrile Butadiene Styrene 200 215 ASA - Acrylonitrile Styrene Acrylate 100 600 HDPE - High Density Pol...