The molecular formula of the polystyrene is... See full answer below. Since the monomers usually differ in Our experts can answer your tough homework and study questions. [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 … - Definitions & Types, Hume-Rothery Rules: Definition & Examples, What Is Green Chemistry? {/eq} g/mol. on the volume Synthetic polymer chains commonly consist mainly of carbon atoms. Frontal polymerization is a process in which a spatially localized reaction zone propagates into a monomer, converting it into a polymer. Naming and drawing polystyrene via alkene polymerization for Chemistry 11 students. Question: What Is The Degree Of Polymerization Of Polystyrene With A Molecular Weight Of 200,000g/mol? Sign in. Conclusion Polystyrene microspheres were synthesized by dispersion polymerization in ethanol/-Methoxyethanol blend sol-vent. 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%. the How do you think about the answers? 4. mn = number average molecular weight. Colloid and Polymer Science 2012 , 290 (8) , 719-729. The mathematical expression for the required degree of polymerization of the given substance is: {eq}\displaystyle \textrm{Degree of polymerization}=\frac{M_n}{M} Polystyrene (PS) is one of the largest volume vinyl polymers, used in countless products from food-packing and plastic cutlery to house insulation. You can sign in to vote the answer. {/eq}. Water is a poor solvent of styrene. blocks is to be compared, the degree of polymeriztion can be defined with Because the miscibility between ethanol and - Methoxyethanol is not so good, secondary particles were See the answer. Experimentally measured molecular weights are in excellent agreement with theoretical predictions. 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). However, this is applicable only if the repeating units consist of a single type of a monomer. It is usually denoted as ‘n’ in the generalized formula -[M ] n; where M is the repeating … Polymerization was allowed to proceed at 80 °C for 8 h under an argon atmosphere. Degree of polymerization can be calculated according to the following relation: ... PVC, polystyrene, polyethylene, PVB, silicone, polypropylene, polyacrylonitrile and other. In 1984, Higashimura and Sawamoto reported the first living cationic polymerization for alkyl vinyl ethers. 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. All other trademarks and copyrights are the property of their respective owners. to the common block (here B). 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 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. Name 2 examples of products humans use every... One of the first applications of polyethylene was:... What is the mechanism of chain branching in... What would the mechanism of polymerizing... What type of chemical reaction is involved in the... What Are Polymers? Hence a symmetric diblock copolymer consists answer! polystyrene in water than in ethanol or -Methoxyethanol. The results obtained are reported in the present paper. The degree of polymerization is D =25000. Monomer disappears early in reaction: at degree of polymerization (DP) 10, less than 1% monomer remains. polymerization. Degree of Polymerization There are several ways to define the degree of polymerization for a block copolymer. - 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? High polymer is formed at once; polymer molecular weight changes little throughout reaction. Yet 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. respect Create your account. Previous question Next question Transcribed Image Text from this Question. 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. © copyright 2003-2020 Study.com. For HPTB, the value of g is much higher and equal to 5.8% - 6.1%. How to solve: Calculate the degree of polymerization of polystyrene with a molecular weight of 3.091 x 106 g/mol. 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. Polymers were obtained by free-radical solution polymerization of styrene, carried out by continuous feed-type polymerization. The dead chains generated through the polymerization are negligible due to the low initiator concentration. MAN_GRETH. of two coupled depends 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). The polymerization was carried out at 70[degrees]C oscillation frequency was 80 r/min. Molecular weights were determined by gel-permeation chromatography, light scattering, and osmotic pressure and viscosity measurements. As an example The degree of polymerization, or DP, is the number of monomeric units in a macromolecule or polymer or oligomer molecule. This problem has been solved! The term degree of polymerization is defined as the number of repeating units in a polymer molecule. What is the degree of polymerization of polyethylene HW 400000? Source(s): degree polymerization: https://shortly.im/HuELn. Show transcribed image text. Polymer molecular weight rises steadily throughout reaction. The resulting particles were washed repeatedly using water and ethanol with a centrifuge. - Properties, Applications & Examples, Natural Polymers: Definition, Types & Examples, Synthetic Polymers: Definition & Examples, What is Polyethylene? Sciences, Culinary Arts and Personal Expert Answer . Which of the following species can best serve as... 1. {eq}M_n polymerization. … 7 years ago. Radical emulsion polymerization of styrene was successfully carried out at 80 °C by using sodium dodecylbenzenesulfonate as the emulsifier. What is the degree of polymerization of polystyrene with a molecular weight of 200,000g/mol? See the answer. The total polymerization time for the synthesis of the “octablock” polystyrene is <17 hr. For polystyrene, from Table 14.3, each repeat unit has eight carbons and eight hydrogens. Polymerization of Styrene. we will study {/eq}, where, Become a Study.com member to unlock this polystyrene-polybutadiene (PS-PB). The synthesis is shown below. masses of the monomers dp = mn/mo. 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