Synthesis and properties of organic‐silica nanocomposites with perhydropolysilazane

Abstract

ABSTRACT:The synthesis and properties of the organic polymersilica nanocomposites by blending perhydropolysilazane with organic polymer having hydroxyl groups have been described. Poly(methyl methacrylate) (PMMA)-silica nanocomposites with a PMMA/silica lamellar structure and spherical silica domains in a PMMA matrix were obtained with random copolymers and block copolymers. The effect of the architecture of the random and block copolymers on the morphology of composites has been summarized. The thermal stability, electrical properties, such as field break down, leakage current, etc., and surface hardness of the composites have been discussed.

Inorganic–Organic Silica/PDMS Nanocomposite Antiadhesive Coating with Ultrahigh Hardness and Thermal Stability

“…Here, perhydropolysilazane (PHPS) and PDMS are adopted, which are an ideal polymeric precursor for uniform-rigid silica film and a well-recognized low-surface-tension material, respectively. A new polymeric precursor was first synthesized with dihydroxyalkyl-terminated polydimethylsiloxane (HOC-PDMS) and PHPS via the reaction between the −OH group in PDMS and the Si–N/Si–H bonds in PHPS (Figure S1 in the Supporting Information). , Then, SPNC was prepared by coating the polymeric precursor on substrates, followed by vacuum ultraviolet (VUV) irradiation at room temperature (Figure a). VUV irradiation converts PHPS moiety into a dense inorganic silica via a photocleave and oxidation process, while the PDMS maintains in silica continuous phase (Figure S2 in the Supporting Information). − By tuning ratio of PDMS to PHPS in the copolymer, inorganic–organic silica/PDMS coatings were prepared, denoted as C1–C50, according to the ratio of PDMS in silica.…”

Modification of perhydropolysilazane with aluminum hydride: Preparation of poly(aluminasilazane)s and their conversion into Si–Al–N–C ceramics

“…10 Among poly(silazane)s, perhydridopolysilazane (PHPS), prepared via ammonolysis of the pyridine adduct of H 2 SiCl 2 , is known to be an attractive soluble precursor with a relatively high-ceramic yield. 4 PHPS has been utilized for Si 3 N 4 -based composites, and the reactivity of SiH and NH groups in PHPS has been used to introduce different metals into precursor structures; modified PHPS has been employed for the preparation of Si-B-C-N-(O), [11][12][13][14] Si-Al-O-N, 15 Si-Y-(C)-N-O, [16][17][18] Si-Y-Ti-C-N-O, 19 and Si-Ti-N 20,21 ceramics.…”

The Effect of CaSiO3 Nano-Particles Reinforced Denture Polymethyl Methacrylate

“…Among those clays being used, montmorillonite (MMT) is frequently used in preparing clay/polymer nanocomposites, and MMT/PMMA nanocomposites were studied comprehensively [10][11][12][13][14][15][16][17]. The SiO 2 nanoparticles is the most common one used in nanocomposite [18][19][20][21]. Other nano-materials such as nano-Al 2 O 3 [22], nano-CaCO 3 [23], nano-Al(OH) 3 [24] , have also been applied to modify PMMA.…”