Study on Ring-Opening Copolymerization of Trioxymethylene and Second Monomer Initiated by Phosphotungstic Acid
Table 1
1H-NMR results of copolymerization of TOX with the second monomer.
Serial number
Sample
Second monomer
n(T):n(O)(O)a) (mol%)
n(T):n(O)(O)b) (mol%)
p (TOX-co-DOX)
1
p (TOX98-co-DOX2)
98 : 2 (2%)
99.18 : 0.52 (0.33%)
2
p (TOX96-co-DOX4)
96 : 4(4%)
98.40 : 1.60(1.60%)
3
p (TOX94-co-DOX6)
94 : 6(6%)
96.24 : 3.76(2.37%)
4
p (TOX92-co-DOX8)
92 : 8(8%)
96.10 : 3.90(3.90%)
5
p (TOX90-co-DOX10) p (TOX-co-D4)
90 : 10(10%)
95.68 : 4.32(4.32%)
6
p (TOX98-co-D42)
98 : 2(2%)
99.84 : 0.16(0.16%)
7
p (TOX96-co-D44)
96 : 4(4%)
99.69 : 0.31(0.31%)
8
p (TOX92-co-D48)
92 : 8(8%)
99.66 : 0.34(0.34%)
9
p (TOX90-co-D410)
90 : 10(10%)
99.58 : 0.42(0.42%)
10
p (TOX88-co-D412) p (TOX-co-CHO)
88 : 12(12%)
99.36 : 0.64(0.64%)
11
p (TOX99-co-CHO1)
99 : 1(1%)
99.76 : 0.24(0.44%)
12
p (TOX98-co-CHO2)
98 : 2(2%)
99.47 : 0.53(0.60%)
13
p (TOX97-co-CHO3)
97 : 3(3%)
98.93 : 1.07(1.43%)
14
p (TOX96-co-CHO4)
96 : 4(4%)
98.51 : 1.49(2.14%)
15
p (TOX95-coCHO5)
95 : 5(5%)
96.39 : 3.61(3.24%)
n(T):n(O) represents the mole ratio of TOX with the second monomer. (O)a) represents the feeding mole fraction of the second monomer; (O)b) represents the mole fraction of the second copolymerization component in the total copolymerization component calculated by equations (1)–(3).
