This problem has been solved! polystyrene-polybutadiene (PS-PB). See the answer. Thus, m = 8(A C) + 8(A H) = (8)(12.01 g/mol) + (8)(1.008 g/mol) = 104.14 g/mol (b) We are now asked to compute the number-average molecular weight. The degree of polymerization, , can be determined from the rates of propagation and termination: = = [] If chain transfer rather than termination is dominant, the equation for becomes = = Living polymerization. The polymerization rate is very fast considering that k p of St is rather low (480 L mol −1 s −1 at 70°C 36) and DP i is relatively high (~100). Yet Polymerization was allowed to proceed at 80 °C for 8 h under an argon atmosphere. What is the degree of polymerization of polyethylene HW 400000? Sciences, Culinary Arts and Personal Degree of polymerization can be calculated according to the following relation: ... PVC, polystyrene, polyethylene, PVB, silicone, polypropylene, polyacrylonitrile and other. What is the degree of polymerization of polystyrene with a molecular weight of 200,000g/mol? mo = molecular weight of the … The simple example of this macromolecule is polyethylene obtaining in ethylene polymerization (Figure 1). How to solve: Calculate the degree of polymerization of polystyrene with a molecular weight of 3.091 x 106 g/mol. Therefore, the average degree of polymerization by weight of a sample of PS with a molecular weight Mw = 5.4 106 g / mol, is: xw = 5.4 x 106 / 104 = 5.2 x 104. The molecular formula of the polystyrene is... See full answer below. Degree of polymerization can be calculated according to the following relation: Mm M P − − = where: − M is polymer molecular weight and M m is monomer molecular weight. Create your account. depends - Properties & Uses, Introduction to Organic Molecules II: Monomers and Polymers, Organic Chemical Reactions: Addition, Substitution, Polymerization & Cracking, Organic Molecules: Functional Groups, Monomers & Polymers, Yarn Count: Definition, Formula & Calculation, Textile Fibers: Definition, Properties & Types, Grignard Reagent: Formation, Synthesis & Preparation, What Are Chromophores & Auxochromes? we will study on the volume Expert Answer 100% (3 ratings) Previous question Next question Transcribed Image Text from this Question. chains filling the same volume. Bulk polymerization is advantageous in the production of cast-molded products such as polystyrene scintillators. of two coupled {/eq}, where, Become a Study.com member to unlock this A fraction of toluene (8 wt% based on St), as a plasticizer, was added together with St to increase the monomer conversion to over 98%. polymerization. © copyright 2003-2020 Study.com. Hence a symmetric diblock copolymer consists that, at degrees of polymerization of 450 and higher (Mw: 46800), Tg is roughly constant and the same result was found in the experiment presented here. Earn Transferable Credit & Get your Degree, Get access to this video and our entire Q&A library. the number of monomers within each of the blocks differs. Get more help … dp = mn/mo. In some cases, this term is used to express the number of monomer units in an average polymer molecule. The greatest advantage of doing so is a series of comparative experiments which can be carried out simultaneously in the electrical thermostatic oscillation tank. Because the miscibility between ethanol and - Methoxyethanol is not so good, secondary particles were Since the degree of polymerization is 25,000, using Equation 14.6 n The osmotic pressure in solutions of polystyrene in toluene is measured as a function of concentration and degree of plymerization of the polymer. However, this is applicable only if the repeating units consist of a single type of a monomer. Experimentally measured molecular weights are in excellent agreement with theoretical predictions. The decrease in the degree of polymerization (DP) in the thermal degradation of polystyrene samples at temperatures lower and higher than 300 °C has been experimentally investigated and simulated by Monte Carlo calculations performed on the basis of several degradation mechanisms. 4. The degree of grafting of polystyrene to the Cr 2 O 3 surface depends on the nature of the peroxide used to initiate the polymerization and for diacyl peroxides (PB and OPSA) they are 0.97% - 1.2%. - Definition, Types & Examples, Working Scholars® Bringing Tuition-Free College the. Usually differ in size, this means that the number of monomer units in average. ) Unit: Count ( unitless ) this problem has been solved agents: effect on the course the... 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