【摘 要】
：
To develop an efficient and bio-compatible way to improve the thermal and mechanical properties of addition type liquid silicone rubber (LSR),a series of modified LSR samples were prepared by introducing octavinyl-polyhedral oligosilsesquioxanes (VPOSS) a
【机 构】
：
School of Printing and Packaging, Wuhan University, Wuhan 430079, China;Engineering Research Center
【出 处】
：
武汉理工大学学报（材料科学版）（英文版）
论文部分内容阅读
To develop an efficient and bio-compatible way to improve the thermal and mechanical properties of addition type liquid silicone rubber (LSR),a series of modified LSR samples were prepared by introducing octavinyl-polyhedral oligosilsesquioxanes (VPOSS) and high purity silicon sol singly or in combination before vulcanization.Significant correlation was found between the loading rate of VPOSS and thermal properties.However,mechanical properties were negatively correlated with VPOSS content within the range experimented,which may be ascribed to material defect caused by uneven distribution and aggregation.Furthermore,test results approved that the introducing of silicon sol indeed affected the stabilities of the polymer by restraining the material defect caused by the aggregation of POSS molecules and improving cross link density.For example,adding 10％-20％ of silicon sol into VPOSS(1.0％) modified LSR will increase tear resistance by 43.9％-85.7％,elongation at break by 31.7％-57.3％,residue at 800 ℃ in N2 atmosphere by 32.0％-37.9％,residue at 650 ℃ in air atmosphere by 70.9％-91.6％,respectively.This work proves that,to incorporate VPOSS into LSR by hydrosilylation,and to use silicon sol as dispersant and reinforce filler can become an efficient way to improve the mechanical property,thermal stability and bio-compatibility of LSR in the future.
其他文献
Ge50-xSbxTe50 and Ge50-xBixTe50 ternary alloys were synthesized by vacuum melting at 1273 K with the starting materials of Ge, Bi, Sb, and Te. The lattice structures were analyzed based on X-ray diffraction patterns, which could all be indexed to R3m rhom
To evaluate the effect of pulse parameters on the formation of electrodeposits in concrete cracks, five different types of pulse current were set up, and ZnSO4 and MgSO4 solutions were used as the electrolytes. The rate of weight gain, rate of surface coa
A series of FePd based alloy films were deposited on glass substrates by DC magnetron sputtering.The Ag toplayer effect was studied using FePd(67.5 nm)/Ag(3.875,7.75,15.50,31 and 38.75 nm)films annealed at 600 ℃ for different time in order to find the rol
A new kind of zirconium(Zr) complex containing ligand of salicylaldehyde-imine was suc-cessfully synthesized with ZrCl4·2THF and salicylaldehyde-imine as raw materials. The ligand was character-ized by means of 1HNMR, IR, and GC-MS, and Zr complex was cha
A novel photosensitive copolymer P(SS-co-AA-g-GMA) (PSAG) was synthesized and utilized to noncovalently functionalize pristine single-walled carbon nanotubes (SCNTs). PSAG was highly effective for the solubilization of SCNTs in water and validated by UV-v
In order to improve the oxidation resistance of TiAl alloy,silicide coatings were prepared by pack cementation method at 1273,1323,and 1373K for 1-3 hours.Scanning electron microscopy (SEM),energy dispersive spectrometry (EDS) and X-ray diffraction (XRD)
To study the extraction difficulty of lithium ions from various crystal planes of Li2TiO3,according to the first principle,four representative crystal surfaces of Li2TiO3(precursor),(-133),(-206),(002) and(-131),were selected to establish a model and to c
The pastes containing different dosages of fly ash were taken into ultraviolet radiation and low temperature freeze condition simultaneously(URL) for 30 days and only ultraviolet radiation condition(UR) for 30 days after standard curing,so as to investiga
Taking dodecanethiol as the representative, we investigated the corrosion inhibition perfor-mance of SAL in seawater under pressures from 0.1 to 9 MPa. By using scanning Kelvin probe, the dodeca-nethiol SAL is confirmed to build on Cu surface, and the mod