Results of bulk polymerization of ε-caprolactone (ε-CL) using P₂O₅ and isopropanol (mole ratio 200/1) at 100 °C for different reaction times.

Time (min)	Conv.a (%)	M nth b (g mol−1)	M n c (g mol−1)	Đ c
10	20	4625	3.84 × 103	1.13
20	32	73 364	4.56 × 103	1.15
30	72	16 496	16.98 × 103	1.16
60	83	19 007	18.62 × 103	1.15
90	90	20 605	20.53 × 103	1.40
180	98	22 371	21.48 × 103	1.59

^aConversion of CL.

^bThe theoretical molecular weight was calculated from [M]₀/[P₂O₅] × conv. × (MW of Monomer) + (MW of iPrOH).

^cNumber-average molar and dispersity (Đ) are determined by SEC relative to polystyrene standard, values are the ones obtained from SEC × correction factor of 0.56 ± 0.05 for PCL.¹⁹ d = not determined.