Synthesis of Controllable Carboxylated Polystyrene Microspheres by Two-Step Dispersion Polymerization with Hydrocarbon Alcohols

Table 2

Wavenumbers of functional groups in IR spectra of microspheres.

Number	Wavenumber (cm^−1)	Absorption peak
1	~3100–3000	The stretching vibration peak of -C–H- on benzene ring
2	2922	The stretching vibration peak of -C–H- on saturated carbon
3	1703	The stretching vibration peak of the C=O bond on the carboxyl group
4	1452	The stretching vibration peak of -C=C- on benzene ring
	1601
	1493