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For electronic packaging applications, polymer based SiO2 composites with low CTE and low elastic modulus are of great importance to the thermal or mechanical stress relief and reliability improvement. However, it's still a great challenge to achieve these goals simultaneously by incorporating conventional SiO2 filler into resin matrix. In this study, we prepared the mesoporous SiO2 filler through...
The paper presents the influence of various fillers having different sizes (0.3 μm to 18 μm) and surface modifications (unmodified, modified by the material supplier and in-situ modified during compounding) to the erosion resistance of HTV Silicone Rubber (SR) composites. The particles used were Aluminium-Trihydrate (ATH), Alumina (Al2O3) and Silica (SiO2), while the main research focus was on ATH...
Carboxylated acrylonitrile butadiene rubber (XNBR) latex was filled with surface modified precipitated silica. Surface modification of silica was affected in an aqueous medium by reacting with a synthetic polymer (SP) containing both hydrophilic and hydrophobic groups. The effectiveness of SP in enhancing reinforcing action of silica in XNBR latex films was evaluated through investigation of mechanical...
This contribution chronicles the development of nanodielectrics with particular reference, with examples, to the enhancement of useful properties which can be brought about by the inclusion of nanoparticulates and by surface functionalization. Emphasis is given to the importance of proper processing and critical quantification of these 21st century materials. The impact of the establishment of internal...
Since the 1970's two basic polymer compositions have been in use for outdoor electrical insulation applications as an alternative to porcelain and glass; these compositions are based on silicone rubber (SiR) and Ethylene Propylene Diene Monomer (EPDM) and a mixture of these two compositions, called an alloy, is also in use. To impart erosion and tracking resistance under dry band arcing to these compositions...
The fracture responses of interfaces under either monotonic or fatigue loading conditions were investigated by using double cantilever beam (DCB) tests. The tests were performed using a custom-developed micro-tester. The applied load vs. interfacial crack opening relationship obtained from the DCB experiment was analyzed by using a beam on elastic foundation-based closed-form expression for determining...
Polyethylene oxide (PEO) is a water-soluble polymer often used as a model system to observe filler effects. This paper details an investigation into the physical, thermal and electrical properties of polyethylene oxide composites containing micro-(SD) and nano-silicon dioxide (nSD) filler. Three molecular weight host PEOs were used - 100,000 g mol-1, 400,000 g mol-1 and 1,000,000 g mol-1 and the SD...
Molecular imprinting, a templated polymerization technique, is a promising method to prepare a functional polymeric network for targeted binding of molecules in a selective recognition process. In this work, a silica-based (polysiloxane) polymer was utilized in a sol-gel process to fabricate a molecularly imprinted polymer (MIP). The manufactured MIP was imprinted with a template molecule, lysozyme...
A highly selectively synthetic molecular imprinted polymer (MIP) sorbent for 17-B-estradiol was prepared using a non-covalent imprinting technique. The MIP polymers were synthesized in ethanol by using 17-B-estradiol as the template, 3-aminopropyltriethoxysilane as the functional monomer, HCl as catalyst. When compared with the nonimprinted polymer (NIP), the MIP displayed outstanding affinity and...
Composite samples of low-density polyethylene (LDPE)/ nano-SiO2 and LDPE/ micro-SiO2 were prepared with a method of double-solution mixture, respectively. Depolarization currents of all samples were investigated with thermally-stimulated current. It is found that the currents of both composites increase with the loading level of nano-SiO2 and/or micro-SiO2, and the peak width of each composite is...
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