In
this study, a novel bisphenol-containing cyclohexane group [4,4′-(cyclohexane-1,1-diyl)bis(2-methoxyphenol)
(CDBMP)] was synthesized. It was reacted with 4,4′-dichlorodiphenylsulfone
to synthesize polyether sulfone-containing −OCH3 groups (PES–OCH3). Then, PES–OCH3 was reacted with BBr3 and (t-Boc)2O to yield PES–OH and PES–Boc, respectively.
The glass transition temperatures of PES–OCH3 and
PES–OH were found to be 177.6 and 240.7 °C, respectively.
The resultant resins exhibited good tensile strength and solubility
(dissolved in N-Methyl-2-Pyrrolidine, dimethylformamide, and so on).
Interestingly, PES–Boc showed excellent foam property, and
the density of the foam decreased from 1.23 to 0.012 g/cm3. Also, we found that the dielectric constant and dielectric loss
values (107 Hz) of the foaming sample were in the range
of 1.9–2.7 and 4.22 × 10–3 to 7.99 ×
10–3, respectively. The introduction of hydroxyl-Boc-assisted
modification provides a controllable process to fabricate porous and
ultra-light materials, and it can be potentially applied in these
fields such as microelectronics and high speed communication systems.
A series
of thermoplastic and optical transparent polyimide-bearing
aliphatic rings were manufactured through a two-step approach. The
solubility and melt processability were significantly enhanced after
embedded with flexible thio-ether moieties. The complex viscosity
was within 225.6–3980 Pa·s from 330 to 300 °C. The
modified polyimide exhibited moderate mechanical strength to 76 MPa.
The 5% thermal weight loss temperature was around 443 °C, with
a glass transition temperature of 204.6–234.8 °C. Although
the cyclic aliphatic segments endowed the obtained PIs with improved
optical performance, the transmittance could be up to 82% at 450 nm,
while the transmittance of industrialized thermoplastic polyimide
derived from PMDA and ODA was less than 20% under the same condition.
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