This study was focused on thermal properties of ethylene copolymers with di-, tri- and tetra-alkenylsilsesquioxanes (POSS) synthesized by ansa-metallocene complex. Ethylene copolymers with multi-alkenyl POSS were characterized by different thermal behavior depending on the kind of POSS comonomer and its content, as well as the copolymer structure. The copolymers differed in the incorporation way of POSS into the polymer chain (linear and crosslinked structure), content of specific unsaturation groups, molecular weight, as well as heterogeneity of polymer chain compositions. It was found that the kind and content of unsaturation groups in E/POSS copolymers played a significant role in the thermal stability of the obtained hybrid materials determined in non-isothermal conditions. Thus, linear copolymers showed higher thermal stability in comparison with neat polyethylene and crosslinked copolymers.

Thermal stability of copolymers under iso-thermal conditions (1500 h heating at 100 °C) of polymeric products was primarily determined by the kind and content of silicon-oxygen POSS cage incorporated into the polymer chain. Incorporation of alkenylsilsesquioxane with completely condensed POSS cage into the polymer chain caused significant improvement of thermal stability, even in case of crosslinked copolymers, in contrast to comonomers with incompletely condensed silicon-oxygen POSS cage.

这项研究的重点是通过ansa-合成的乙烯共聚物与二，三和四烯基倍半硅氧烷（POSS）的共聚物的热性能。茂金属配合物。具有多烯基POSS的乙烯共聚物具有不同的热行为，这取决于POSS共聚单体的种类及其含量以及共聚物的结构。共聚物的不同之处在于POSS进入聚合物链的方式（线性和交联结构），特定不饱和基团的含量，分子量以及聚合物链组成的不均一性。发现在非等温条件下，E / POSS共聚物中不饱和基团的种类和含量对所得杂化材料的热稳定性起着重要作用。因此，与纯聚乙烯和交联共聚物相比，线性共聚物显示出更高的热稳定性。

聚合物在等温条件下（在100°C加热1500 h时）的共聚物热稳定性主要取决于掺入聚合物链中的硅氧POSS笼的种类和含量。与具有不完全缩合的硅-氧POSS笼的共聚单体相比，即使在交联共聚物的情况下，将具有完全缩合的POSS笼的烯基倍半硅氧烷与聚合物链结合也可显着提高热稳定性。