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picture1_Bulk Polymerization Example 87891 | 6752 Item Download 2022-09-15 01-49-02


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File: Bulk Polymerization Example 87891 | 6752 Item Download 2022-09-15 01-49-02
chapter 3 chapter 3 molecular weight molecular weight 1 thermodynamics of polymer solution 2 mol wt determination 1 weight shape and size of polymers 1 weight shape and size of ...

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                 Chapter 3
                  Chapter 3
              Molecular Weight
              Molecular Weight
        1. Thermodynamics of Polymer Solution
        2. Mol Wt Determination
         1. Weight, shape, and size of polymers
         1. Weight, shape, and size of polymers
           monomer – oligomer – polymer
              dimer, trimer, ---
              telomer ~ oligomer from telomerization (popcorn polymerization)
              telechelic polymer ~ with functional group
              macro(mono)mer ~ with polymerizable group [wrong definition 	p72]
              pleistomer ~ mol wt > 1E7
           usual range of mol wt of polymers
              25000 ~ 1E6
              mol wt of chain polymers are higher 
           molecular weight  conformation Æ shape      molecular size
              LS (solution) and SANS (bulk) determine size.
              DSV and GPC utilize this relation in solution.
                                                               Ch 3-1 Slide 2
         2. Solution
          2. Solution
            ΔG = ΔH –T ΔS
                m        m          m
                                                    m for mixing
                                                    f for melting (fusion)
               ΔSm > 0  always 
               ΔHm > 0  almost always
                   “like dissolves like”
                   ΔHm = 0 at best (when solute is the same to solvent)
                   if not, ΔHm > 0
                   ΔHm < 0 only when specific interaction like H-bonding exists
               For solution, ΔH < T ΔS
                                 m         m
                                                                     Ch 3-1 Slide 3
         Solubility parameter
         Solubility parameter
                                    ½              ½ 2               : solvent
            ΔH = V [(ΔE /V ) –(ΔE /V ) ] v v                        1
               m      m       1   1          2   2        1 2        : solute
                  = V [δ – δ ]2 v v                                 2
                       m    1    2     1 2
               ΔE ~ cohesive energy ~ energy change for vaporization
                  ΔE = ΔH     –PΔV ≈ ΔH    –RT  [J]
                          vap            vap
               ΔE/V ~ cohesive energy density  [J/cm3 = MPa]
                                               ½
               δ ~ solubility parameter [MPa ]
                       ½        6     2 ½          3 ½                 3 ½
                  [MPa ] = [(10 N/m ) ] = [(J/cm ) ] ≈ [(1/2)(cal/cm ) ]
                                                      	Table 3.1 & 3.2
                                                                   Ch 3-1 Slide 4
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...Chapter molecular weight thermodynamics of polymer solution mol wt determination shape and size polymers monomer oligomer dimer trimer telomer from telomerization popcorn polymerization telechelic with functional group macro mono mer polymerizable pleistomer e usual range chain are higher conformation ls sans bulk determine dsv gpc utilize this relation in ch slide g h t s m for mixing f melting fusion sm always hm almost like dissolves at best when solute is the same to solvent if not only specific interaction bonding exists solubility parameter v cohesive energy change vaporization p rt vap density table...

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