1374852-40-0Relevant academic research and scientific papers
Extremely high thermal resistive poly(p -phenylene benzobisoxazole) with desired shape and form from a newly synthesized soluble precursor
Fukumaru, Takahiro,Fujigaya, Tsuyohiko,Nakashima, Naotoshi
, p. 4247 - 4253 (2012)
The poly(p-phenylene benzobisoxazole) (PPBO) fiber, known as Zylon, has a very high thermal stability as well as mechanical strength when compared to any other polymers due to its ladder-like rigid structure. However, one of the critical drawbacks of its stiff structure is its insolubility in organic solvents, and only strong acids can be used use for fiber spinning of this polymer. To overcome the poor processability caused by this insolubility in organic solvents, a soluble PPBO precursor was designed and synthesized by the reaction of tert-butyldimethylsilyl (TBS) group-functionalized 4,6-diaminoresoisinol with terephthaloyl chloride for polycondensation. The obtained TBS-functionalized PPBO precursor (TBS-prePBO) shows an excellent solubility in common organic solvents, such as N-methylpyrrolidone (NMP), N,N-dimethylacetamide (DMAc), and dimethyl sulfoxide (DMSO). Transparent TBS-prePBO films made by the solution-cast method provided PPBO films after thermal treatment at 500°C for 1 h. The structure of the obtained PPBO films was characterized by IR and XRD techniques and found that the films exhibited extremely high thermal stabilities, namely, the synthesized PPBO polymer decomposition temperature reached 670°C in flowing N2, which is the highest temperature among the organic polymers reported so far.
Nanoporous benzoxazole networks by silylated monomers, their exceptional thermal stability, and carbon dioxide capture capacity
Patel, Hasmukh A.,Ko, Dongah,Yavuz, Cafer T.
, p. 6729 - 6733 (2015)
The pursuit of synthetic routes for design and preparation of nanoporous polymeric networks with inherent permanent microporosity and functionality through bottom-up methodologies remains a driving force in developing CO2-philic materials. We report nanoporous, processable, benzoxazole-linked covalent organic polymers (Box-COPs) that show exceptional thermal stability up to 576 °C. Box-COPs can be formed into films thanks to the silylation that is used to guide polymeric network formation. Surface areas of up to 606 m2 g-1 and narrow pore sizes of 4.36 ? were observed with a CO2 uptake capacity of 139.6 mg g-1 at 273 K and 1 bar. Box-COPs were stable in boiling water for a week without deteriorating CO2 capture capacity.
Preparation method of epoxy-terminated p-phenylene benzodioxazole precursor
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Paragraph 0026, (2017/08/28)
The invention provides a preparation method of an epoxy-terminated p-phenylene benzodioxazole precursor. The preparation method is characterized in that on the basis of a scheme using TBS-DAR to synthesize PBO, glycidol containing epoxy groups is introduced into a PBO molecular structure through the reaction of the acyl chloride groups of intermediate TPC-prePBO and hydroxyl groups, and Epoxy-prePBO is prepared. The epoxy-terminated p-phenylene benzodioxazole precursor Epoxy-prePBO which is well compatible with PBO fibers is used for carrying out copolymerization modification on BADCy resin, so that the interfacial bonding strength of the Epoxy-prePBO/BADCy modified resin and the PBO fibers is improved, and the pull-out strength of a PBO fiber/BADCy micro-composite material is increased to 3.02-3.10MPa from 2.93MPa in the prior art.
