The degree of polymerization, or DP, is usually defined as the number of monomeric units in a macromolecule or polymer or oligomer molecule. The polyester Dacron and the polyamide Nylon 66, shown here, are two examples of synthetic condensation polymers, also known as step-growth polymers. (c) Polyethylene having a density of 0.985 g/cm3 and a degree of polymerization of 2500; polyethylene having a density of 0.915 g/cm3 and a degree of polymerization of 2000 Solution (a) Shown below are the specific volume-versus-temperature curves for the polypropylene and polystyrene materials. It is the earliest polymerization technique in the synthetic polymers. In addition, the arrangement of the polymer molecules upon extrusion is very amorphous. 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. The number average degree of polymerization X n of chains formed at a certain moment is dependent on the termination mechanism: * combination: X n = 2 * disproportionation: X n = chemistry: 63. The step polymerization builds up the molecular weight of polymer by stepwise function. Compared to the 10,000 unit degree of polymerization in cotton, ordinary viscose rayon has a degree of polymerization of only 400. Lecture 4 Polymerization mechanisms Polymerization Monomer Polymer 64. The acrylic fibres process a very pleasing, warm and soft handle. The degree of polymerization is the number of mono meric units in a macromolecule or polymer molecule . Poly(ethylene terephthalate) (PET) is one of the most widely used linear semicrystalline thermoplastic polyester in many industrial and everyday applications because of its good mechanical and thermal properties, non-toxicity, processing low energy requirements and high chemical resistance [1,2,3].Therefore, PET has been extensively used for the manufacture of beverage bottles, packing … If we divided , the molecular weight of polymer by the molecular weight of monomer , then we can get the degree of polymerization . Sometimes, the polymerization involves the release of small molecule by-product, so it is also called condensation polymerization. ... Polyester fiber is now the largest man-made fibre in terms of volume of production. As a result the fiber is more absorbent, but much weaker than cotton. degree of polymerization translation in English-French dictionary. The degree of polymerization of silk fibroin is uncertain, with DP of 300 to 3000 having been measured in different solvents. Silk Fibre Structure. This means that 70% of the possible reactions have already occurred, even though we are still dealing with a very low average degree of polymerization. The reaction mixture in line 4 of Table 2.1 is characterized by a number average degree of polymerization Nn = 10/3 = 3.3, with only 30% of the functional groups remaining. Polyvinyl alcohol (PVA) fibers were prepared using PVA with different degree of polymerization (DP) under the same wet spinning process. 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. Only 400 is the earliest polymerization technique in the synthetic polymers called condensation polymerization English-French.! 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