Preparation and Characterization of Chain-Extended Bismaleimide/Carbon Fibre Composites

Table 1

Tentative assignment of the main absorption bands of FTIR.

Unmodified BMI	Intensity	Tentative assignment	Modified BMI	Intensity	Tentative assignment
3464	w	C=O	No C=O group
NH2 group not present			3389	m	NH2 Asymmetrical
3101	m	C–H maleimide	No C–H maleimide
3038	w
2900	vw	CH2	2925	vw	CH2
1709	vs	C=O	1712	vs	C=O
		asymmetrical stretching			asymmetrical stretching
1602	w		1613	w
1511	vs		1513	m
		Benzene ring			Benzene ring
1393	vs	–C–N –C–	1393	s	C–N–C
		stretching			stretching
1146	vs	–C–N–C–	1148	s	C–N–C
		maleimide			maleimide
1030	m		1025	w
949	m		950	w
833	s		827	s
		maleimide			maleimide
688	s		689	m
586	m	CH	586	m	CH

Vs—very strong, s—strong, m—medium, w—weak, and vw—very weak