Synthesis and chemical modification of new functional aromatic polyethers by phase transfer catalysis

Figures & data

Figure 1. Synthesis of dibromo diesters (EBr₂)_n.

Figure 2. Synthesis of polyether.

Figure 3. ¹H NMR spectrum of polymer 6 g.

Figure 4. ¹³C NMR spectrum of polymer 6c.

Table 1. Yields, average molecular weights, and glass transition temperatures of the various polyethers.

Entry	n	Biphenol	Catalyst	Solvent	T (°C)	Polyether	Yield (%)	Mw (g mol^−1)	Tg (°C)
1	2	BPA	aliquat	toluene	80	P2	62.3	2102	−17.2
2	3	BPA	TBAB	nitrobenzene	80	P3	64.2	3150	−4.5
3	4	BPA	aliquat	nitrobenzene	80	P4	60.4	3420	−5.5
4	5	BPA	aliquat	nitrobenzene	80	P5	63.7	4052	−7
5	6	BPA	aliquat	nitrobenzene	60	P6a	68.1	7100	–
6	6	BPA	aliquat	nitrobenzene	80	P6b	76.2	10,950	10.5
7	6	BPA	aliquat	nitrobenzene	110	P6c	71.4	7820	8.1
8	6	BPA	aliquat	O-dichlorobenzene	80	P6d	72.3	7200	–
9	6	Catechol	aliquat	toluene	80	P6e	70.1	6320	–
10	6	Catechol	TBAB	nitrobenzene	80	P6f	57	5840	−1.3
11	6	Catechol	TDA1	nitrobenzene	60	P6 g	54	3510	−6

Figure 5. DSC trace of polymer 6c.

Figure 6. DSC trace of polymer 6 g.

Figure 7. Hydrolysis of polyether ester.

Figure 8. ¹H NMR spectrum of polymer H1.