# degree of polymerization

23. For most industrial purposes, degrees of polymerization in the thousands or tens of thousands are desired.   For a homopolymer, there is only one type of monomeric unit and the number-average degree of polymerization is given by. What does degree of polymerization mean? A common means of expressing the length of a chain is the degree of polymerization, which quantifies the number of monomers incorporated into the chain. Information and translations of degree of polymerization in the most comprehensive dictionary definitions resource on the web. Definition of degree of polymerization in the Definitions.net dictionary. The degree of polymerization, DP is the original number of molecules divided by the remaining number of molecules and approaches a number equal to the original number of molecules as N approaches one. Degree of polymerisation of paper. Meaning of degree of polymerization. There are several versions of this equation, proposed by Wallace Carothers, who invented nylon in 1935. Degree of Polymerization There are several ways to define the degree of polymerization for a block copolymer. The molecular weight of a particular polymer molecule is a product of the degree of polymerization and the molecular weight of the repeating unit. The degree of polymerization, or DP, is the number of monomeric units in a macromolecule or polymer or oligomer molecule.. For a homopolymer, there is only one type of monomeric unit and the number-average degree of polymerization is given by â¡ =, where M n is the number-average molecular weight and M 0 is the molecular weight of the monomer unit. The degree of polymerization, or DP, is usually defined as the number of monomeric units in a macromolecule or polymer or oligomer molecule. New insulating paper has typically a DP of 1100 and a high tensile strength. The extent of paper degradation is represented by the degree of polymerisation or DP of paper. Number of monomer molecules which take part in polymerization is (1 Point) Degree of polymerization Molecular weight of polymer Tg of polymer None of the above In step-growth polymerization, the Carothers equation (or Carothers' equation) gives the degree of polymerization, X n, for a given fractional monomer conversion, p.. Cellulose chain length expressed as cellulose DP can affect the mechanical properties of composite materials and paper products, the solubility of cellulose in a given solvent, and the efficiency of enzymatic hydrolysis of lignocellulosic biomass. In linear polymers the individual polymer chains rarely have exactly the same degree of polymerization and molar mass, and there is always a distribution around an average value. DP No ' N Thus, the degree of polymerization can be expressed by DP = No N0d-P) i 1-P Consider a reaction that can be pushed to 90% completion. 1.2 The degree of polymerization (or the degree of condensation) of a particular cellulose molecule is the number of anhydro-Î²-glucose monomers, C 6 H 10 O 5, in the cellulose molecule. The degree of polymerization (\(DP\)) in a polymer molecule is the number, n, of repeating units in the polymer chain. The most naive one is just the total number of monomers: N1 = NS + NB A more sophisticated way is to use the geometric mean of NS and NB: N2 = 2 sqrt{NS NB} This corresponds to introducing a mean molar volume v = sqrt{vS vB} Degree of polymerization (DP) is one of the most important structural properties of cellulose.