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

Table 4

TG and DSC results of the copolymer.

Serial number	Sample	Thermal decomposition temperature ^c)(°C)	Melting temperature ^d)(°C)	Melting enthalpy ^d)(J/g)	Crystallinity (%)
	HOPOM	209.05	172.15	124.3	49.85
	p(TOX-co-DOX)
1	p(TOX98-co-DOX2)	306.54	168.79	123.1	49.37
2	p (TOX96-co-DOX4)	308.35	166.99	118.6	47.56
3	p (TOX94-co-DOX6)	309.17	165.90	116.7	46.80
4	p (TOX92-co-DOX8)	338.07	164.88	107.8	43.23
5	p (TOX90-co-DOX10)	358.67	163.37	103.2	41.39
	p (TOX-co-D4)
6	p (TOX98-co-D42)	226.40	172.12	129.7	52.01
7	p (TOX96-co-D44)	229.37	172.23	132.5	53.02
8	p (TOX92-co-D48)	234.21	173.33	119.8	48.04
9	p (TOX90-co-D410)	236.81	173.03	121.9	48.89
10	p (TOX88-co-D412)	249.50	172.17	121.1	48.56
	p (TOX-co-CHO)
11	p (TOX99-co-CHO1)	304.52	168.09	129.9	52.09
12	p (TOX98-co-CHO2)	349.92	166.60	131.8	52.86
13	p (TOX97-co-CHO3)	383.03	155.65	123.7	49.60
14	p (TOX96-co-CHO4)	381.31	154.85	104.8	42.01
15	p (TOX95-co-CHO5)	372.72	140.89	56.7	22.72

^c)Data from TGA results. ^d)Data from DSC results.