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

Table 2

Microwave- assisted polymerisation of L,D-LA using complex (1 )^(a).

Entry	Time (min)	Conversion^(b) (%)	Activity^(c)	𝑀𝑤^(d) (g⋅mol^-1)	𝑀𝑛^(e) (g⋅mol^-1)	MWD^(f)	𝑇𝑔^(g)
1	20	3%	2.9	—	—	—	—
2	40	38%	17.1	—	—	—	—
3	60	68%	19.4	22300	17400	1.3	46.0
4	80	88%	18.9	27100	20900	1.3	50.1

^(a)[𝐿,𝐷-LA]/[Ti] ca. 200, L,D-LA =1 g, maximal power 200W; ^(b)determined by ¹H NMR; ^(c)kg(PLDA)⋅mol(Ti)^-1⋅h^-1; ^(d)number average molar mass measured by HPLC-SEC; ^(e)weightaverage molar mass measured by HPLC-SEC; ^(f)molecular weight distribution; ^(g)glass transition temperature as measured by DSC analysis.