Acta 26 1394 1934 Gert Strobl The Physics of Polymers 3 rd Edition Heidelberg 2007. Simply stated a polymer is a long-chain molecule that is composed of a large number of repeating units of identical structure.
Molecular Weight of Repeat unit.
Polystyrene repeat unit. Change the double bond in. Polystyrene In other cases repeating and monomer units differ from the monomer by a limited number of atoms in the chemical formula as in the following example. Hesse Polymere an Phasengrenzflaechen First Edition Bremen 2004.
Polystyrene is one of the most widely used plastics the scale of its production being several million tonnes per year. Repeating units can also be made from two monomers. For polystyrene from Table 53 each repeat unit has eight carbons and eight hydrogens.
Van-der-Waals Volume V vW. A collection of products made from polystyrene. In this diagram the little n means that this group of atoms is repeated over and over to make the large polystyrene molecule you see on the right and below.
What you guys again. Styrene is polymerized by using free-radical initiators primarily in bulk and suspension processes although solution and emulsion methods are also employed. Molecular weight of repeat unit.
Molecular weight of repeat unit 8 12 gmol 8 1. Solution a The repeat unit molecular weight of polystyrene is called for in this portion of the problem. First we have to calculate the repeat unit molecular weight of polystyrene.
In its pure state PS is stiff brittle and clear. General-purpose polystyrene is clear hard and rather brittle. The repeat unit is highlighted in blue.
When drawing one you need to. The polymerisation of a styrene monomer to form a polystyrene polymer. B Compute the number-average molecular weight for a polystyrene for which the degree of polymerization is 25000.
A cup a guitar case polystyrene carvings and floating pool noodles. 1123 Polystyrene Polystyrene PS is polymerized through addition polymerization of styrene monomer Figure 16. The sum of the masses of each atom in the formula of the gas measured in atomic mass units.
UoK Problem 11 A sample of polystyrene is found to have a number average molar mass of 89440 gmol. The repeat unit is repeated over and over again many times to make up the long chain of the polymer. The repeat unit is highlighted in blue.
As the repeat unit is styrene having chemical formula. The small n means that there are many of them. B Compute the number-average molecular weight for a polystyrene for which the degree of polymerization is 26000.
Solution a The repeat unit molecular weight of polystyrene is called for in this portion of the problem. A repeat unit or repeating unit is a part of a polymer whose repetition would produce the complete polymer chain except for the end-groups by linking the repeat units together successively along the chain like the beads of a necklace. Molecular weight of repeat unit 8 C 8 H.
144 a Compute the repeat unit molecular weight of polystyrene. It is an inexpensive resin per unit weight. Molar Volume V m.
The presence of the pendant phenyl C 6 H 5 groups is key to the properties of polystyrene. We can deduce the structrure of the monomers by imagining the compounds which might be used to make the amide group. We notice that the repeating unit is linked to the rest of the chain by amide functional groups and that the repeating unit contains an amide group.
Monomer repeating unit monomeric unit polymer -amino-capronic. 300 200 nm. A The repeat unit molecular weight of polystyrene is called for in this portion of the problem.
B A simplified representation of polyvinyl acetate. The brackets contain the repeat unit. The difference between polystyrene and polyethylene is that each repeat unit in styrene has a big pendant group instead of one of the Hs.
It is a rather poor barrier to oxygen and water vapour and has a relatively low melting point. By doing this we loose all information of the spacial arrangement of the repeat units. Polymer molecules are very large compared with most other molecules so the idea of a repeat unit is used when drawing a displayed formula.
For polystyrene from Table 143 each repeat unit has eight carbons and eight hydrogens. Thus m 8A C 8A H. The structure of the polymer repeating unit can be represented as.
A The repeat unit is styrene b The number-average molecular weight is 2392000 gmol. Kuhn Kolloid Zeitschrift 68 2 1934 and.