Interlayer functionalization of magadiite with sulfur-containing organosilanes

The role of interlayer grafting on the mechanical properties of magadiite/styrene‐butadiene rubber composites

“…Reacting CMGD with Si69 using a relatively low Si69:MGD ratio (0.067 g/g) produces the product (OS) 0.10 (CTA) 0.95 MGD, denoted below as l‐SMGD. Full characterization results show that Si69 grafting is accompanied by displacement of some of the adsorbed CTA + . However, XRD results show that l‐SMGD has a layer spacing of 2.88 nm, only slightly less than that of CMGD.…”

“…Na‐MGD was cation‐exchanged in an aqueous suspension containing 1.16 mmol cetyltrimethyl ammonium (CTA + ) per gram of Na‐MGD, resulting in uniform exchange of CTA + for Na + as reported previously and references cited therein. Cetyltrimethyl ammonium bromide (CTAB, Sigma‐Aldrich) was used as received.…”

“…The CTA‐treated MGD product (denoted as CMGD) was used as the starting material for functionalization with either bis ‐(triethoxysilylpropyl) tetrasulfide (TESPT, known commercially as Si69) or 3‐mercaptopropyltriethoxysilane (MPTES). Full details of the synthesis and characterization of these silane‐functionalized MGD materials may be found in our previous work …”

“…Similarly, reacting CMGD with MPTES (0.70 g/g MPTES:MGD ratio) produces (OS) 1.20 (CTA) 0.35 MGD, denoted below as MMGD. For both of these materials, full characterization results demonstrate that Si69 or MPTES grafting displaces most of the adsorbed CTA + . Moreover, the MGD layer spacing values decrease from 3.10 nm to 2.26 and 2.15 nm for m‐SMGD and MMGD, respectively.…”

“…Table lists all of the composites prepared and reported in this work. The filler loading was constant at 26.3 phr based on inorganic content; the nominal (actual) filler loadings (Table ) varied due to the differing organic content as measured by TGA, as published previously . Composites were prepared using a standard procedure involving batch mixing, two‐roll milling, and vulcanization in a heated hydraulic press, also as detailed previously …”