## 3 Results and Discussion
### Unreacted TAIC in Laminates  
[PERSON] et al. [54] studied the curing reaction of TAIC and pointed out that the unsaturated bonds of TAIC are difficult to be fully consumed because TAIC chains have bulkier isocyanate side groups than the chains derived from the polymerizations of other multi-allyl compounds, and rigid TAIC chains lead to a reduced interaction between polar isocyanuric rings belonging to both the polymer chain and TAIC monomer. These dissociated -C=C- bonds either came from the partially reacted TAIC molecules or from the unreacted free TAIC molecules in the system (Scheme 2). To identify and quantify the soluble components of the cured samples, a certain amount of cured P/T-0.25 and P/T-1.50 samples were crushed and extracted for 12 h in boiled MEK and the extracts were studied by HPLC, \({}^{1}\)H-NMR, and \({}^{13}\)C-NMR.  
Figure 5: The calibration curve for –C=C– absorbance of TAIC at 3086 cm\({}^{-1}\).  
\begin{table}
\begin{tabular}{c c c c c} \hline
**P/T-0.00-L** & **mTAIC (mg)** & **nTAIC (mmol)** & **n-C=C- (mmol)** & **A\({}_{\textbf{Peak area-3086}}\)** \\ \hline
0 & 0 & 0 & 0 & 0 \\
1.56 & 0.6686 & 0.0027 & 0.0081 & 0.48 \\
2.87 & 1.2300 & 0.0049 & 0.0148 & 0.83 \\
4.52 & 1.9371 & 0.0078 & 0.0233 & 1.78 \\
5.99 & 2.5671 & 0.0103 & 0.0309 & 1.88 \\
8.60 & 3.6857 & 0.0148 & 0.0444 & 3.72 \\ \hline \end{tabular}
\end{table}
Table 3: Calculation of fitting data of different amounts of P/T-0.00-L sample powders.  
The standard curve for quantitative HPLC analysis was established by measuring several TAIC/MEK solutions with a given TAIC concentration, as shown in Figure 6a,b. Based on the linear regression equation obtained and the chromatograms of the extracts (Figure 6c), it was found that there was 276.72 mg of TAIC in the extract of P/T-0.25, which meant that 14.74% of the TAIC did not take part in the reaction and it occupied 6.24% of the total mass of the sample. Furthermore, in P/T-1.50, these values were 7.49 mg, 0.48%, and 0.20% (Table 4).  
Similar phenomena were observed with NMR measurements. \({}^{1}\)H-NMR and \({}^{13}\)C-NMR spectra of the extracts were shown in Figure 7a,c. When Figure 7a,c were enlarged in equal proportions (Figure 7b,d), similar phenomena as the HPLC could be obtained. There was 286.29 mg of TAIC in the extract of P/T-0.25, but not in P/T-1.50. It was found that 15.26% of the TAIC in P/T-0.25 did not participate in the reaction, which was 6.46% of the total mass of the sample (Table 3).  
Figure 6: (**a**) Chromatograms of extracts from P/T-0.25 and P/T-1.50; (**b**) HPLC chromatograms of TAIC/MEK solution with different TAIC mass fractions; (**c**) TAIC calibration curve. The abscissa was the detected TAIC quality, and the ordinate was the area of TAIC peak.  
\begin{table}
\begin{tabular}{c c c c c c c c} \hline \hline
**Sample** & **Weight (mg)** & **HPLC (mg)** & **wt\%** & **wt\%** & **1H-NMR** & **wt\%** & **wt\%** \\  & & **(in TAIC)** & **(in Sample)** & **(mg)** & **(in TAIC)** & **(in Sample)** \\ \hline P/T-0.25 & 4433.0 & 276.72 & 14.74\% & 6.24\% & 286.29 & 15.26\% & 6.46\% \\ P/T-1.50 & 3690.4 & 7.49 & 0.48\% & 0.20\% & 0 & 0 & 0 \\ \hline \hline \end{tabular}
\end{table}
Table 4: Quantitative analysis results of different test methods.  
Figure 7: (**a**,**b**) \({}^{1}\)H-NMR spectra of different samples’ extractions; (**c**,**d**) \({}^{13}\)C-NMR spectra of different samples’ extractions.