Amine-functionalized POSS as cross-linkers of polysiloxane containing γ-chloropropyl groups for preparing heat-curable silicone rubber

Applications of α, ω‐telechelic polydimethylsiloxane as cross‐linkers for preparing high‐temperature vulcanized silicone rubber

“…Figure provides the cure curve of torque versus curing time at 160°C for MCSR/MATTPS. It shows that the torque increases with the curing time and reaches the maximum at a certain curing time, which is similar to our previous studies of MCSR and the typical cure curve of rubber reported in previous literature . This result suggests that the cross‐linking networks are formed via the chemical cross‐linking reaction of amino groups with γ ‐chloropropyl groups during curing.…”

“…The TG and DTG curves of the representative MCSR/ATPS (MCSR/ATPS‐2) in nitrogen are also illustrated in Figures and , respectively. Two degradation stages can be observed in the thermal behaviors of MCSR/MATTPS‐2 during heating in nitrogen, which is similar to the degradation profiles of MCSR cured with the cross‐linkers in our previous studies . Thus, it can be inferred that MCSR cured with different kinds of cross‐linkers exhibit the same degradation mechanism in nitrogen: The first degradation step was mainly attributed to the depolymerization of CPPS, whereas the second degradation step at temperatures above 600°C was mainly attributed to the breakdown of cross‐links .…”

“…The vulcanizate was finally obtained through the reaction of amino groups of MATTPS with γ-chloropropyl groups of CPPS during curing process. The cross-linking mechanism for the preparation of MCSR/MATTPS is shown in Scheme 2. which is similar to our previous studies of MCSR 19,20,22,23 and the typical cure curve of rubber reported in previous literature. 35 This result suggests that the cross-linking networks are formed via the chemical cross-linking reaction of amino groups with γ-chloropropyl groups during curing.…”

“…To explore it for practical application, several polyamine compounds with various architectures were developed as cross-linkers of CPPS for preparing MCSR, including polyamidoamine dendrimers, siloxane polyamidoamine dendrimers, aminopropyl-modified silica, and amine-functionalized polyhedral oligosilsesquioxane. [20][21][22][23] The results of these researches further demonstrate the feasibility of using this novel curing method as a simple, convenient route for preparing HTV silicone rubber with excellent properties. Furthermore, we found that those cross-linkers with many amino groups can link more than two chains and thereby trigger concentrative cross-linking in the three-dimensional polymer networks.…”

“…Thus, this novel curing method offers a facile and inexpensive route to the preparation of HTV silicone rubber. To explore it for practical application, several polyamine compounds with various architectures were developed as cross‐linkers of CPPS for preparing MCSR, including polyamidoamine dendrimers, siloxane polyamidoamine dendrimers, aminopropyl‐modified silica, and amine‐functionalized polyhedral oligosilsesquioxane . The results of these researches further demonstrate the feasibility of using this novel curing method as a simple, convenient route for preparing HTV silicone rubber with excellent properties.…”