By Thomas L. Szabo (Auth.)
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Additional info for Plastics. Inside Out
If q5 = 0, atoms that are covalently bonded to C1 and t o C 4 come into close contact; consequently the potential energy of that shape or conformation is high. However, if ~b = 180 ~ atom C4 is at a maximum distance from C1, and none of the atoms bonded to C4 comes close to an atom bonded to C1. Hence, the potential energy has a minimum value. This is referred to as the trans (t) conformation of the bond C2~C3. Further sub-minima at 4~ = + 60 ~ are referred to as gauche + (g+) and gauche- (g-) conformations.
The higher melting point of polypropylene (170~ compared with HDPE (135 ~ makes it more suitable for fibre applications, and 30% of the production goes into carpets and ropes. About 20% is used in the form of oriented polypropylene film for wrapping potato crisps, cigarettes, etc. where good clarity is required. 3 Polyvinyl chloride Most of the PVC intended for melt processing is made by suspension polymerisation in a batch reactor (Fig. 16), a large stirred pressure vessel with a water cooling jacket for temperature control.
2 defines the rotation angle ~b of bond C2--C 3 from the relative positions of bonds C1--C2 and C3--C4. PMMA g PE c+g I PET I c+rl (c +)g ! L Figure 3. I ! o a I I 0 200 Temperature ~ I D g Glassy L Liquid c Crystalline rl Rubbery liquid R Rubber D Decomposes I 400 Changesin the state of five typical polymers with changes in temperature. Chapter 3 Microstructure 57 >. 2 Internalenergy variation with rotation of a C ~ C bond in polyethylene. If q5 = 0, atoms that are covalently bonded to C1 and t o C 4 come into close contact; consequently the potential energy of that shape or conformation is high.