Table 3.
Mean values of melting peak temperature Tm, melting enthalpy ∆Hm, crystallization peak temperature Tc, and crystallization enthalpy ∆Hc derived from DSC. Subscript numbers 1 and 2 indicate first and second peak observed in a given heating or cooling scan.
| Tm1 | ∆Hm1 | Tm2 | ∆Hm2 | Tc1 | ∆Hc1 | Tc2 | ∆Hc2 | |
|---|---|---|---|---|---|---|---|---|
| °C | J/g | °C | J/g | °C | J/g | °C | J/g | |
| rPE-A | 132.5 | 176.6 | 162.5 | 4.0 | 117.5 | 181.0 1 | - | - |
| rPE-C | 131.9 | 177.7 | 160.4 | 3.7 | 118.2 | 181.5 1 | - | - |
| rPE-D | 131.3 | 201.4 | - | - | 117.8 | 202.0 | - | - |
| rPE-E1 | 131.3 | 173.1 | 159.0 | 2.6 | 117.7 | 177.7 1 | - | - |
| rPE-E2 | 131.0 | 179.1 | - | - | 117.7 | 181.1 | - | - |
| rPE-F | 131.5 | 190.8 | - | - | 118.1 | 189.2 | - | - |
| rPP-A | 126.1 | 4.5 | 164.0 | 70.7 | 123.6 | 88.7 2 (79.2) 3 | 115.2 | (9.5) 3 |
| rPP-C | 124.4 | 1.2 | 162.6 | 74.4 | 124.9 | 85.7 2 | 110.3 | - |
| rPP-D | 124.5 | 2.1 | 158.9 | 56.7 | 122.1 | 77.9 2 | 110.8 | - |
| rPP-F | 126.8 | 12.2 | 161.8 | 59.8 | 123.1 | 83.4 2 (66.6) 3 | 115.8 | (16.8) 3 |
1 Numbers refer to entire exothermal enthalpy change, including crystallization of minor PP fraction. 2 Numbers refer to entire exothermal enthalpy change, including a small amount from crystallization of minor PE fraction. 3 Numbers in brackets are derived from splitting overlapping peaks at 119 °C. Value thus obtained for ∆Hc1 of PP fraction is likely underestimated, while ∆Hc2 of PE fraction is likely overestimated.