Study on Ring-Opening Copolymerization of Trioxymethylene and Second Monomer Initiated by Phosphotungstic Acid

Table 2

Cationic copolymerization of TOX and DOX.

Initiator	Dosage of initiator (ppm)	Yield (%)	(g/mol)
BF3·O(Bu)2	70	75.8	6.9	2.42
BF3·O(Bu)2	60	75.6	7.2	2.42
BF3·O(Bu)2	50	76.2	7.6	2.37
BF3·O(Bu)2	40	58.9	8.4	2.22
BF3·O(Bu)2	20	—	Nonpolymerization	—
H3PW12O40	12	77.8	8.8	2.36
H3PW12O40	10	78.6	9.8	2.22
H3PW12O40	8	74.3	10.6	2.31
H3PW12O40	6	69.2	13.2	2.12
H3PW12O40	4	—	Nonpolymerization	—

The polymerization temperature is 80 °C. The feeding ratio (mol%) of TOX and DOX is 96 : 4.