Polyisocyanurate from IPDI was synthesized by using quaternary amine salt

N

N

N-trimethyl—N-(2-hydroxyethyl)ammonium hydroxide(TMR-3) as catalyst．The structure analysis and characterization of the product was studied by NMR(1H

13C

DEPT

13C-1H-HMBC)．The peaks at δ3．509～3．650

4．094—5．047

3．052— 3．374

3．749—3．766 of the 1H-NMR spectrum were attributed to the hydrogen proton on the 1’。carbon atom connecting with the nitrogen atom of N＝C＝O

the hydrogen proton on the 1”acarbon of the IPDI trimer

the hydrogen proton on the 10”a carbon connecting with the nitrogen atom of N＝C＝O

the hydrogen proton on the 10’a carbon of the IPDI trimer

respectively．The peaks at δ 122．07—122．41

δ 123．04～123．41 of the 13C—NMR spectra belonged to the double bonded carbon of N＝C＝O of 12"and 11"．The peaks at δ 150．06．δ 150．87—150．97 of the 13C—NMR spectra belonged to the carbon on the carbonyl group of the IPDI trimer of 11”and l2’．The peaks at δ 48．75～49．01．δ 49．07—50．78 of the 13C—NMR spectra belonged to the tertiary carbon of 1’and 1”．The peaks at δ 51．14．δ 57．18～57．20 of the 13C—NMR spectra belonged to the l0”carbon of methylene．The peaks at δ 54．70

δ 57．18～57．20 of the 13C-NMR spectra belonged to the l0’carbon of methylene．The results show the main product of IPDI self-polymerization was trimer isocyanurate．Trimefized isocyanuric and isocyanate groups were main groups in the polyisocyanurate．1D and 2D NMR can differentiate two sorts of earbonyl groups and establish the connections of all carbon and hydrogen atoms of mixed structures that originated from four different substitutions．The calculated area values of peaks demonstrated the structure characterization of the polyisocyanurate．