4.6 Molecular weight data for some polymer are tabulated here. Compute (a) the number-average molecular weight and (b) the weight-average molecular weight. (c) If it is known that this material's degree of polymerization is 710, which one of the polymers listed in Table 4.3 is this ...
A High molecular weight increases the impact resistance of the material. The higher degree of entanglement means that in order to rupture, more polymer bonds need to be broken, this means that the polymer can absorb more energy before failing. ...
Chapter 2 Molecular Weight and Polymer Solutions 2 . 1 Number Average and Weight Average Molecular Weight Molecular Weight RangesAverage, WeightWeight, MolecularAnalysis, EndgroupOsmometry, MembraneOsmometry, Vapor PressureSpectrometry, MassMeasurements, Refractive I...
High-quality GPC data contains detailed information on many aspects of the p... YV Kissin - 《Journal of Polymer Science Part A Polymer Chemistry》 被引量: 241发表: 1995年 Characterizing synthetic polymers by MALDI MS. MALDI MS is a powerful tool for determining molecular-weight distributions ...
A novel and simple method is described for evaluation of molecular weight – viscosity relationships for a polymer where only broad molecular weight distribution samples are available. The method demands measurement of the intrinsic viscosity and GPC chromatograms of several samples. Results of applying...
Molecular weight Themolecular weightof a polymer can govern other properties such as particle size and stiffness, and therefore has a significant influence on immune responses by specifying these properties. However, in some cases the molecular weight of a polymer may have more direct effects on imm...
13, No. 12, pp 1119-1123 (1981) Molecular Weight Dependence of Critical Amplitudes in Polymer Solutions Kenji SHINOZAKI and Takuhei NOSE Department of Polymer CHemistry, Tokyo Institute of Technology, Ookayama, Meguro-ku, Tokyo 152, Japan. (Received June 30, 1981) ABSTRACT: Universal ratios ...
The molecular weight Mx then can be calculated according to the following equation: (16) VERIFICATION Previously1 it was concluded on the basis of experimental data2 that for 0.03 < < 0.1, the molecular weight of a given polymer calculated from the model is higher than a nominal one, but ...
9The molecular weight of PHB Despite themolecular massis an important property in determining the application of PHB, research on the molecular mass of PHB accumulated in bacteria has rarely been carried out. The molecular mass of the polymer is an important factor in determining the physical prope...
were estimated for carbon fiber polymer precursors such as poly(acrylonitrile-co-itaconic acid) synthesized by semi batch solution polymerization in mixed solvents media with the azonitrile compounds as initiator under the different ratios of solvent and non solvent from 0.75 to 2.5 in weight. The...