Prepolymerization of Lacquer Sap under Pure Oxygen Atmosphere and Its Effects on the Properties of Lacquer Film

Table 1

The molecular weight distribution of the raw and the prepolymerized lacquer saps under different atmospheres.

Sample	Prepolymerization time	Oxygen atmosphere^b			Air atmosphere
		Polymer/%	Oligomer/%	Monomer/%	Polymer/%	Oligomer/%	Monomer/%
RL^a	0 h	0.09	17.23	82.68	0.09	17.23	82.68
1	0.5 h	3.64	48.61	47.75	0.50	28.29	71.21
2	1.0 h	4.66	58.32	37.02	0.63	31.44	67.93
3	1.5 h	7.10	55.35	37.55	0.88	32.87	66.25
4	2.0 h	10.95	58.62	30.43	1.08	33.34	65.58
5	2.5 h	15.84	54.38	29.78	1.10	34.17	64.73
6	3.0 h	20.48	56.24	23.28	1.51	37.85	60.64

Raw lacquer; ^bpolymer: ; oligomer: ; monomer: .