All other trademarks and copyrights are the property of their respective owners. the [1] [2] [3] For a homopolymer, there is only one type of monomeric unit and the number-average degree of polymerization is given by D P n ≡ X n = M n M 0 {\displaystyle DP_{n}\equiv X_{n}={\frac {M_{n}}{M_{0}}}} , where M n is the number-average molecular weight and M 0 is the … Molar What is the degree of polymerization of polystyrene with a molecular weight of 200,000g/mol? Since the degree of polymerization is 25,000, using Equation 14.6 n 4. Emulsion polymerization of styrene using irreversible addition–fragmentation chain transfer agents: effect on the course of the polymerization and molecular weight. If a whole series of block copolymers containing always one of contain 8 H and 8 C atoms and 4 C and 6 H atoms, respectively. is to be compared, the degree of polymeriztion can be defined with The dead chains generated through the polymerization are negligible due to the low initiator concentration. Our method takes advantage of the powerful seeded emulsion polymerization strategy with the well-known principle of "like dissolves like" … Synthesis of Polystyrene Particles with Precisely Controlled Degree of Concaveness Polymers (Basel). Figure 3 Dependence of Glass Transition Temperature on Molecular Weight How do you think about the answers? {/eq}, where, Become a Study.com member to unlock this In some cases, this term is used to express the number of monomer units in an average polymer molecule. 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. © copyright 2003-2020 Study.com. The polymerization was carried out at 70[degrees]C oscillation frequency was 80 r/min. The primary reasons for its great popularity are its low cost, high transparency, good mechanical properties and ease of coloring, foaming, and processing. polymerization. The value of the molecular weight of polystyrene {eq}(C_8H_8)_n For example, branched polystyrene with target primary chain length of DP n = 100 monomer units, but branching restricted to the second 50 monomer units, was synthesized by initially targeting a number‐average degree of polymerization DP n = 50 monomer units using styrene (5 g, 48.0 mmol), TMEDA (0.96 mmol), and 30 mL of anhydrous benzene placed under nitrogen flow in a thoroughly … The molecular formula of the polystyrene is... See full answer below. mo = molecular weight of the … Expert Answer 100% (3 ratings) Previous question Next question Transcribed Image Text from this Question. 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. The results obtained are reported in the present paper. block degree of polymerizations (~100 per block) for a model system of “octablock” polystyrene (PS) in just 2 hr per block. What is the degree of polymerization of polyethylene HW 400000? Show transcribed image text. on the volume taken up by each block. Sciences, Culinary Arts and Personal polystyrene-polybutadiene (PS-PB). Create your account. Question: What Is The Degree Of Polymerization Of Polystyrene With A Molecular Weight Of 200,000g/mol? The mathematical expression for the required degree of polymerization of the given substance is: {eq}\displaystyle \textrm{Degree of polymerization}=\frac{M_n}{M} Calculate the degree of polymerization of polystyrene with a molecular weight of {eq}3.091 \times 10^6 Hence a symmetric diblock copolymer consists Previous question Next question Transcribed Image Text from this Question. Degree of Polymerization? The greatest advantage of doing so is a series of comparative experiments which can be carried out simultaneously in the electrical thermostatic oscillation tank. The simple example of this macromolecule is polyethylene obtaining in ethylene polymerization (Figure 1). 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. {/eq} is the value of the molecular weight of the given polymer. Polymerization was allowed to proceed at 80 °C for 8 h under an argon atmosphere. 2018 Apr 21;10(4):458. doi: 10.3390/polym10040458. In 1984, Higashimura and Sawamoto reported the first living cationic polymerization for alkyl vinyl ethers. Source(s): degree polymerization: https://shortly.im/HuELn. Our experts can answer your tough homework and study questions. 0 0. respect of two coupled How to solve: Calculate the degree of polymerization of polystyrene with a molecular weight of 3.091 x 106 g/mol. Definition & Relation to Source Reduction, Textile Yarns: Definition, Types & Classification, Solubility Equilibrium: Using a Solubility Constant (Ksp) in Calculations, UExcel Earth Science: Study Guide & Test Prep, OSAT Physics (CEOE) (014): Practice & Study Guide, ILTS Science - Physics (116): Test Practice and Study Guide, ILTS Science - Environmental Science (112): Test Practice and Study Guide, SAT Subject Test Chemistry: Practice and Study Guide, CSET Science Subtest II Earth and Space Sciences (219): Test Prep & Study Guide, ILTS Science - Earth and Space Science (108): Test Practice and Study Guide, CSET Science Subtest II Chemistry (218): Practice & Study Guide, Anatomy and Physiology: Certificate Program, Biological and Biomedical The resulting particles were washed repeatedly using water and ethanol with a centrifuge. The term degree of polymerization is defined as the number of repeating units in a polymer molecule. Degree of polymerization can be calculated according to the following relation: ... PVC, polystyrene, polyethylene, PVB, silicone, polypropylene, polyacrylonitrile and other. Expert Answer . 7 years ago. You can sign in to vote the answer. polystyrene in water than in ethanol or -Methoxyethanol. Radical emulsion polymerization of styrene was successfully carried out at 80 °C by using sodium dodecylbenzenesulfonate as the emulsifier. It is usually denoted as ‘n’ in the generalized formula -[M ] n; where M is the repeating … Because the miscibility between ethanol and - Methoxyethanol is not so good, secondary particles were The total polymerization time for the synthesis of the “octablock” polystyrene is <17 hr. Which of the following species can best serve as... 1. Question: Question 4 2 Pts Compute The Degree Of Polymerization For A Polystyrene (PS) Polymer With A Number-average Molecular Weight Of 200362 G/mol. See the answer. Frontal polymerization is a process in which a spatially localized reaction zone propagates into a monomer, converting it into a polymer. - Definitions & Types, Hume-Rothery Rules: Definition & Examples, What Is Green Chemistry? 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%. the number of monomers within each of the blocks differs. Degree of Polymerization There are several ways to define the degree of polymerization for a block copolymer. The degree of polymerization is D =25000. 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} - Properties, Applications & Examples, Natural Polymers: Definition, Types & Examples, Synthetic Polymers: Definition & Examples, What is Polyethylene? size, this means that This problem has been solved! answer! Colloid and Polymer Science 2012 , 290 (8) , 719-729. polymerization. Since the monomers usually differ in {/eq} g/mol. Yet chains filling the same volume. After 24 hours the reaction was terminated. Polymerization of Styrene. 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%. Polystyrene (PS) is one of the largest volume vinyl polymers, used in countless products from food-packing and plastic cutlery to house insulation. 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). Get more help … The phase behavior and the microstructure of block copolymers Finite‐molecular‐mass homopolymers are modeled as binary random mixtures of high polymers and oligomers or chain ends, in proportions determined by the number‐average degree of polymerization. blocks The volume fraction of the polymer in the solution studied ranges up to 0.15, and the degree of polymerization of … The synthesis of polystyrene is carried out using a reaction known as free radical polymerisation. Naming and drawing polystyrene via alkene polymerization for Chemistry 11 students. Polyethylene and Polypropylene See the answer. Bulk polymerization is advantageous in the production of cast-molded products such as polystyrene scintillators. Research has shown that to improve the polymerization rate, the monomer should be distilled prior to the reaction and, where this is impracticable, the product should be rinsed with an appropriate solution. are. 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. mn = number average molecular weight. 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. Sign in. The synthesis is shown below. Molecular weights were determined by gel-permeation chromatography, light scattering, and osmotic pressure and viscosity measurements. Polymer molecular weight rises steadily throughout reaction. Services, What is Polymerization? As an example Earn Transferable Credit & Get your Degree, Get access to this video and our entire Q&A library. The osmotic pressure in solutions of polystyrene in toluene is measured as a function of concentration and degree of plymerization of the polymer. dp = degree of polymerization . - 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? D = 25000. This leads directly to an entropic equation for the effect of molecular mass on T q in terms of the glass‐transition temperatures and transition increments of heat capacity of these two components. Less than 1 % monomer remains up degree of polymerization of polystyrene each block this is applicable if... High polymer is formed at once ; polymer molecular weight of the polymer 4 C and 6 atoms... 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