Meldrum's acid (MA) groups are incorporated into polydimethylsiloxane (PDMS) chains as reactive units to impart self-crosslinkable and modifiable features to PDMS. The synthesis of MA-functionalized PDMS (MA-PDMS) has been performed through hydrosilylation reactions using an MA-functionalized bifunctional styrenic compound and Si–H terminated dimethylsiloxane compounds as monomers. The MA-PDMS samples exhibit number-averaged molecular weights of about 5000–10 000 Da and have been spectrally characterized with Fourier transform infrared and ¹H and ²⁹Si nuclear magnetic spectroscopies. Thermolysis of the MA groups of MA-PDMS is traced with thermal analysis (differential scanning calorimetry and thermogravimetric analysis) to demonstrate the reactivity of MA-PDMS. Self-crosslinking and post-modification reactions of MA-PDMS are carried out with the ketene groups generated from the MA thermolysis reaction through ketene dimerization and nucleophilic addition reactions, respectively. A phosphorus compound (9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide, DOPO) is utilized as the modifier for MA-PDMS post modification so as to result in DOPO-functionalized PDMS (DOPO-PDMS). Based on the developed reaction routes, this work also demonstrates a convenient and effective approach for preparing DOPO-functionalized-PDMS compounds, which are potential flame retardants for polymeric materials exhibiting Si/P synergistic effects on flame retardation.

中文翻译：

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具有Meldrum酸基的可自交联和可改性的聚硅氧烷†

Meldrum的酸（MA）基团作为反应性单元掺入聚二甲基硅氧烷（PDMS）链中，以赋予PDMS自交联和可修饰的特征。MA功能化PDMS（MA-PDMS）的合成已通过使用MA功能化双官能苯乙烯化合物和Si–H封端的二甲基硅氧烷化合物为单体的氢化硅烷化反应进行。MA-PDMS样品的数均分子量约为5000–10000 Da，并已通过傅立叶变换红外光谱和¹ H和²⁹进行了光谱表征硅核磁光谱学。用热分析（差示扫描量热法和热重分析）追踪MA-PDMS的MA基团的热解，以证明MA-PDMS的反应性。MA-PDMS的自交联和后修饰反应分别通过MA热解反应通过烯酮二聚化和亲核加成反应生成的烯酮基团进行。磷化合物（9,10-二氢-9-氧杂-10-磷杂菲-10-氧化物，DOPO）被用作MA-PDMS改性后的改性剂，从而得到DOPO官能化的PDMS（DOPO-PDMS）。基于已开发的反应路线，这项工作还展示了一种方便有效的方法来制备DOPO官能化的PDMS化合物，