Calculate the solubility parameter of polyisobutene from table 3.3. How does thi

Question

Calculate the solubility parameter of polyisobutene from table 3.3. How does this value compare with that shown in figure 3.2?

l;: derived from measurement of heat of evaporation) Group Group molar attraction constants at 25'C (according to Small; derlved from measurement of heat of e Table 3.3 Group G Group single single 340 425 105-115 Br 5-membered 6-membered -CH3 214 Ring -CH2-single-bonded 133 Ring 95-105 I 20-30 CF2 CF,} 28 Conjugation -93 H 190 O 111 19 COO -CH CC2 260 triple as in-CCl, 270 Si (in silicones) 38 (o, m, p) 1146 C 250 Source: P. A. Small, J.Appl. Chem., 3, 71 (1953). Units of G (cal-cm)12/mol. The solubility parameter can be calculated via 82 GM, where M is the mer molecular weight.

Explanation / Answer

The solubility parameters are expressed as ( energy units / cm^3)^1/2

Or as MPa^1/2

So the parameters are

7.85 (cal /cm^3 )1/2 and 16.5 (MPa)1/2

The figure shows that intrinsic viscosity versus the solubility parameter.

The solubility is maximum which shows that viscosity is maximum

From figure (A) , the intrinsic viscosity is maximum at near 7.8 (cal /cm^3 )1/2

So it matches the value

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