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POSS reinforced denture base composites and mechanical properties of

Author: LianXiaoLi
Tutor: LiuHong
School: Jilin University
Course: Clinical Stomatology
Keywords: POSS Nano-SiO2 Mechanical properties
CLC: TB33
Type: Master's thesis
Year: 2011
Downloads: 52
Quote: 0
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Abstract


Objective: This study will be prepared by the use of alternative synthetic nanomaterials POSS, then with PMMA blends obtained POSS-PMMA denture base composites. By FT-IR characterization and mechanical testing to get a new denture base POSS reinforced composites. MATERIALS AND METHODS: alternative synthesis laboratory under the protection of nitrogen prepared POSS; with a silane coupling agent (KH-570) of nano-SiO 2 surface treatment; of nano SiO 2 , silanized nano-SiO 2 and POSS for FT-IR characterization tests. The POSS and silylated SiO 2 by mass fraction of 0%, 0.5%, 1%, 1.5%, 2%, 2.5%, 3% by weight, were added to the MMA monomer to produce sonicated dispersion, and then press and PMMA powder mass ratio of 1:2 was prepared to reconcile standard specimens were recorded as blank group, POSS add groups and nano-SiO 2 Add Group; pair of three experiments material impact strength performance tests were carried out, the surface hardness, friction and wear performance testing performance testing; adopt Japanese JSM-6700F scanning electron microscope (SEM) Impact test specimen fracture scanning electron microscopy. Application of statistical software SPSS17.0 statistical experimental data, analysis and comparison of data between different components of the difference. Results: FT-IR characterization test indicates that the nano SiO 2 Si-O bond with a hydroxyl absorption broad, silylated nano SiO 2 C = O bond has stretching vibration absorption peak and a weak CH 3 methyl stretching vibration absorption peak, POSS have Si-O-Si bond stretching vibration absorption peak, Si-C bond stretching vibration absorption peak, C = C double bond stretching vibration absorption peak, and Si-CH = CH 2 CH bond plane bending vibration absorption peak inside and outside, POSS significantly more than the chemical absorption peak silanized nano SiO 2 and nano-SiO 2 , which indicates that the chemical bonds POSS active, with strong, in the composite dispersion best; mechanical properties test results show that adding POSS and silylation nano-SiO 2 denture base can improve the mechanical properties of composite materials, but the improvement is better than POSS silanized nano-SiO 2 . POSS add a group of three test value curve showed increased first and then decreased, impact strength at 2% POSS content is highest, but compared with the other groups no significant difference (p gt; 0.05); surface hardness In POSS content reaches a maximum of 2%, compared with the other groups were statistically significant (p lt; 0.05); friction and wear strength POSS content is 1.5% maximum, compared with the other groups were statistically significant (p lt; 0.05); scanning electron microscope can be observed in the group POSS added mass fraction of 2% nanoparticles dispersed best agglomeration relatively rare. Conclusion: POSS Add Group nanodrugs SiO 2 Add Group's two-phase interfacial bonding better and less occurrence of particle agglomeration, ie POSS better dispersed in PMMA, thus adding groups either POSS specimen strength or toughness is better than the nano-SiO 2 Add Group; adds POSS of PMMA in mechanical strength and toughness have been effectively improved, adding POSS mass fraction of 2.0% achieve optimum dispersion state of nanoparticles, impact strength and surface hardness than pure PMMA has been significantly improved.

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