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Synthesis, characterization, and cure chemistry of high performance phosphate cyanate ester resins

机译：高性能磷酸氰酸酯树脂的合成，表征和固化化学

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摘要

Three thermosetting cyanate ester resins with phosphate cores have been synthesized from chlorophosphates by a straightforward, three-step approach. A p-substituted bis(cyanate) ester generated by this route (PhosCy) was cured to give a thermoset material with a T-g of 223 degrees C and a char yield of 47% in air, while the m-substituted version (MPhosCy) yielded a thermoset with a T-g of only 131 degrees C and a char yield of 65% in air. The low T-g of the MPhosCy thermoset is attributed to a unique intramolecular cyclization of the cyanate ester groups, while the high char yield is attributed to a high temperature cross-linking reaction involving the phosphate core. To further explore this class of materials, a trifunctional phosphate cyanate ester (PhosCy3) was prepared from POCl3. This material was cured to generate a thermoset with an impressive T-g of > 360 degrees C and a char yield of 67% in air. All three hybrid resins can potentially be used in fire-resistant composite materials or as protective surface coatings for conventional polymers.
机译：已经通过一种简单的三步法从氯磷酸盐合成了三种具有磷酸酯核的热固性氰酸酯树脂。固化通过此方法生成的对位取代的双（氰酸酯）酯（PhosCy），得到热固性材料，Tg为223摄氏度，空气中焦炭产率为47％，而间位取代的双取代氰酸酯（MPhosCy）得到热固性塑料，Tg仅131摄氏度，空气中焦炭产率为65％。 MPhosCy热固性树脂的低T-g归因于氰酸酯基团的独特分子内环化作用，而高焦炭产率归因于涉及磷酸酯核的高温交联反应。为了进一步探索此类材料，从POCl3制备了三官能的氰酸氰酸酯（PhosCy3）。固化该材料可生成热固性塑料，其T-g令人印象深刻> 360摄氏度，空气中炭含量为67％。所有这三种杂化树脂都可以潜在地用于耐火复合材料或用作常规聚合物的保护性表面涂料。

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