Ring-Opening Polymerisation of rac-Lactide Using a Calix[4]arene-Based Titanium (IV) Complex

Table 1

Thermally induced polymerisation of L,D-LA using complex (1 )^(a).

Entry	[L,D-LA]/[Ti] Ratio	Conversion^(b) (%)	Activity^(c)	𝑀𝑤^(d) (g⋅mol^-1)	𝑀𝑛^(e) (g⋅mol^-1)	MWD^(f)	𝑇𝑔^(g)
1	200	96%	9.2	18400	15000	1.2	53.0
2	500	87%	21.0	19100	14900	1.3	52.1
3	1000	88%	42.3	27600	22400	1.2	50.0
4	1994	67%	65.3	43200	36900	1.2	41.7

^(a)𝑇 = 130^∘C, time = 3 h; ^(b)determined by ¹H NMR; ^(c)kg(PLDA)⋅mol(Ti)^-1⋅h^-1; ^(d)number average molar mass measured by HPLC-SEC; ^(e)weight average molar mass measured by HPLC-SEC; ^(f)molecular weight distribution; ^(g)glass transition temperature as measured by DSC analysis.