Table 3. Copolymers of alkylisocyanates 16 and 17.

No.	Batch [16]/[17]*	Polymer† [16]/[17]	Time, hr	Yield,‡ %	DP§	Mw/Mn§	¶	¶
1	50:50	76:24	17	56	90	2.34	-241	-906
2	30:70	71:29	20	23	51	1.73	-242	-906
3	25:75	60:40	20	30	61	1.78	-280	-1048

All polymerizations were carried out with 3-5 mmol of monomers (total amounts) in THF at -95°C. The monomer:initiator ratio was 100:1. Polymerizations were quenched by adding 10 eq of HCl in MeOH.

^*Initial ratio (mol %) of monomers.

^†Ratio (mol %) of monomer units incorporated in the polymer. Determined by complete degradation of the polymer with sodium methanolate and ¹H-NMR spectroscopic analysis of the resulting cyclic trimers.

^‡Fraction insoluble in MeOH.

^§DP, degree of polymerization. Determined by gel-permeation chromatography (polystyrene standard).

^¶c = 0.5, CH₂Cl₂.