Abstract
The molecular structure of hydropolysiloxane curing agents is expected to greatly affect the curing reaction and properties of the cured species, but the exact influence still remains somewhat misunderstood. Herein, we choose two representative cross-linking agents: a linear polysiloxane with the Si–H group (LPHS for short) and a branched polysiloxane with the Si–H group (TPHS for short) and a kind of high refractive index of polysiloxane resin with the vinyl-end group (short for MPSR) which was successfully synthesized in laboratories. The curing behaviors, dynamic mechanical properties, optical and electrical properties, and thermal stability of two kinds of curing systems (MPSR/TPHS and MPSR/LPHS) were systematically investigated and compared. The effect of molecular architecture of two different cross-linking agents on the curing activation energy, reactivity, and reaction rate has been studied by DSC and online FT-IR spectroscopy. The results confirm that the MPSR/TPHS system shows lower effective ac...
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