Poly(delta-gluconolactone) and Poly(delta-gluconolactone-ε-caprolactone) from delta-Gluconolactone and ε-Caprolactone by Ring-Opening Polymerization

Table 2

ROP of d-GL with various time and temperature in MBTO catalytic .

Entry	Temperature/°C	Time/h	/%
(1)	120	24	---
(2)	130	8	48.2
(3)	130	12	56.8
(4)	140	4	51.3
(5)	140	6	63
(6)	140	8	61.7
(7)	150	4	69
(8)	150	6	78.3
(9)	150	8	84.2
(10)	160	4	91.6
(11)	160	6	89.7
(12)	170	4	78.3

reactions were performed in n-octane with MBTO, [d-GL]/[Cat] = 500 : 1, monomer : initiator = 1000 : 1. by integration of methane resonances in ¹H NMR of PGL (DMSO-d₆, 600 MHz).