synthesis and properties of polymer clay nanocomposites

... particular C-Hπ and C-HX in solid state and their properties in solid state and their role in the design and synthesis of organic solids during his studies in the late 80’s and early 90’s showed ... describe the background and review the current literature to understand the rest of chapters The importance and inspiration of the work also has been provided and the scope of the dissertation will ... coordination geometry of IV-1 with labels, H-bonded chains, and packing of 1 showing the alignment of 4spy ligands 4-6 Trang 19Figure 4-3 H-NMR spectra of IV-2 before and after UV irradiation...

Ngày tải lên: 09/09/2015, 11:15

... background and literature review on (i) current nanofabrication techniques, (ii) applications of polymer nanostructures in biomedical fields and (iii) actuation of polymer micro- and ... add to the existing knowledge of polymer nanofabrication by demonstrating the possibilities of fabricating polymer micro- and nanostructures in easy and costeffective ways The various ... SYNTHESIS AND APPLICATIONS OF POLYMER-BASED MICRO- AND NANOSTRUCTURES ZHU MEI B. Eng. (Hons.), NUS A THESIS SUBMITTED FOR THE DEGREE OF DOCTOR OF PHILSOPHY NUS GRADUATE...

Ngày tải lên: 10/09/2015, 09:30

... .18 Ionomers: Synthesis, Structure, and Properties .24 2.3.1 Synthesis of Ionomers: Radical Polymerization 25 2.3.1.1 Synthesis of Random and Block Ionomers ... after 1h of polymerization (■), after 6h of polymerization (▲) 81 Figure 4.9 UV-Vis spectra (at the λmax of AN) of the two copolymerization systems before and after 6 h of copolymerization: ... Self-assembly and polymerization of epoxy resinamphiphilic block copolymer nanocomposites. Journal of the American Chemical Society, 119(11), 2749-2750. Hofmann, M. A. et al. (2002). Synthesis of polyphosphazenes...

Ngày tải lên: 10/09/2015, 15:49

... improved properties Through the development of nanocomposites, properties such as modulus of elasticity, surface hardness, polymerization shrinkage and filler loading were enhanced by the addition of ... physico-mechanical properties Addition of inorganic fillers is often needed to strengthen mechanical properties, provide radiopacity and reduce thermal expansion, polymerization shrinkage and water sorption ... colloidal silica and silica glass containing barium, strontium and zirconium These fillers increase strength and modulus of elasticity and reduce the polymerization shrinkage, the coefficient of thermal...

Ngày tải lên: 14/09/2015, 18:35

... DPGAEM and 2 equivalents of VCE) 55 DPGAEM and 4 equivalents of VCE) 57 DPGAEM and 6 equivalents of VCE) 59 for the assessment of polymerization shrinkage 63 Trang 14hydrosilylation of epoxy ... TGA and SEC to confirm polymer structure and purity Physico-mechanical properties such as post-gel polymerization shrinkage, indentation hardness and modulus of the synthesized materials and ... compounds to control 140 various post-light polymerization time intervals of control and binary blend of compounds A - D with control in 5, 10, 20 and 50 wt% of SSQ nanocomposite ratios respectively...

Ngày tải lên: 14/09/2015, 18:35

... the disorder band associated with structural defects, amorphous carbon created in graphene (D-band) and well ordered scattering of the E2g phonon of sp2 C atoms of graphene (G-band), respectively ... graphene (G-band), respectively [44] The intensity of D-band is stronger than that of G-band, meaning the presence of high density of defects and structure disorder in GO Moreover, the ID/IG intensity ... at 25° The basal spacing of rGO is a little larger than that of GO, revealing the great reduction of GO and exfoliation of layered graphene sheets For Fe2O3/graphene nanocomposites, the XRD pattern...

Ngày tải lên: 13/01/2020, 06:05

... incompatibility of SAN and PP Fig 6 HDT values of PP and SAN/PP blends Fig 7 VST values of PP and SAN/PP blends Fig 8 Impact strength of PP and SAN/PP blends Fig 9 Tensile strength of PP and SAN/PP ... 50 ml/min and heated at 10 °C/min from 25 to 220 °C The degree of crystallinity (Xc) of PP was determined by calculating the ratio of heat of fusion (△Hm) of the specimens to the heat of fusion of 100% ... SAN resins are copolymers of styrene (PS) and acry-lonitrile (AN) ABS is a terpolymer of acryacry-lonitrile, buta-diene and styrene in which styrene provides rigidity and ease of processability,...

Ngày tải lên: 29/05/2020, 13:11

... Trang 1MINISTRY OF EDUCATION AND TRAINING HANOI UNIVERSITY OF SCIENCE AND TECHNOLOGYLE THI THAO VIEN Synthesis and properties of undoped and transition metal (Mn 2+ , Cr 3+ ... SCIENCES HANOI – 2020 Trang 2MINISTRY OF EDUCATION AND TRAINING HANOI UNIVERSITY OF SCIENCE AND TECHNOLOGYLE THI THAO VIEN Synthesis and properties of undoped and transition metal (Mn 2+ , Cr 3+ ... conditional synthesis of Zn2SnO4 and Zn2SnO4: Mn2+ phosphors are estimated, and then the optical properties of Zn2SnO4 and Zn2SnO4: Mn2+ phosphors are studied in detail Chapter 5 Structure and Optical properties...

Ngày tải lên: 22/09/2020, 22:18

... MINISTRY OF EDUCATION AND TRAINING HANOI UNIVERSITY OF SCIENCE AND TECHNOLOGY Le Thi Thao Vien Synthesis and properties of undoped and transition metal (Mn2+, Cr3+) doped Zn2SiO4 and Zn2SnO4 ... Chapter Optical properties of Zn2SiO4 and Zn2SiO4: Mn2+ phosphors - Chapter Optical properties of Zn2SnO4 and Zn2SnO4: Mn2+ phosphors - Chapter Optical properties of Zn2SnO4: Cr3+ and Zn2SnO4: Cr3+, ... coordinates of (0.2477; 0.6829) and the color purity of nealy 85% Chapter OPTICAL PROPERTIES OF Zn2SnO4 AND Zn2SnO4:Mn2+ PHOSPHORS 4.1 Introduction In chapter 4, the dissertation raises the study of synthesis...

Ngày tải lên: 22/09/2020, 22:21

... Synthesis of P3HT via a three-step polymerization process, including: Synthesis of 2-bromo-3-hexylthiophene from 2-bromo-3-hexylthiophene, synthesis of 2-bromo-3-hexyl-5-iodothiophene, and synthesis ... synthesis of regioregular head-to-tail P3HT _ Investigation of the effects of the synthesis parameters on the properties of the synthesized P3HT: In the first step of the synthesis of 2-bromo-3-hexylthiophene ... reaction time and contained 88,2% of 2-bromo-3-hexylthiophene, and the final product after purification had a purity of over 95% In the third step of the synthesis of poly(3-hexylthiophene) (P3HT)...

Ngày tải lên: 22/01/2021, 20:38

... 3.1.1 Synthesis of the drug delivery system (ABNC) (4)synthesis of the drug delivery system are sodium alginate, acryl-amide and silylated bentonite During the synthesis of the DDS, one of the ... Although clay minerals and polymers were often used in the pristine form as a single drug carrier, they did not meet all the requirements The preparation of polymer-layered silicate composite offered ... Article Synthesis and characterization of a clay-alginate nanocomposite for the controlled release of 5-Flurouracil R Surya, Manohar D Mullassery*, Noeline B Fernandez, Diana Thomas Department of...

Ngày tải lên: 04/02/2021, 22:28

... determine the polymerization degree of polymers Here, as used in a few cases,42 polymerization degree of the polymeric phthalocyanines was determined by the comparison method of IR absorption of end ... the decomposition of polymers and weakly protonation of the meso nitrogen atoms in the core of each phthalocyanine unit 2.2 DSC and DTG/TGA measurements Thermal properties of 3–8 were investigated ... disaggregation properties of polymer 5 with some alkali and earth alkali metals were also studied. Thermoanalytic techniques such as DSC and DTG/TGA were used to investigate the thermal properties of compounds...

Ngày tải lên: 12/01/2022, 23:25

... different polymers’ properties It is observed that a small amount of well-dispersed clay mineral in the polymer matrix drastically improves its properties However, studies on polymer/clay nanocomposites ... to reduce the amount of polymer used in the shaped structures,general, a large amount of filler is necessary to improve the desired properties of the polymer Clay minerals, and particularly smectites, ... groups of the organic modifiers, synthesis procedure, and structure of polyimide because of the chemical reactions and physical interactions involved Key words: Polyimide, nanocomposites, organoclay,...

Ngày tải lên: 12/01/2022, 22:37

... acceptance. Fully formatted PDF and full text (HTML) versions will be made available soon. Synthesis and characteristics of NH2-functionalized polymer films to align and immobilize DNA molecules ... stretched and aligned along the direction of the sample's tilting. For the synthesis of the conductive nanowire, DNA molecules were treated with AN-AuNPs of 60 µL for 30 min; AN-AuNPs of 60 ... bundles and random networks, and thus, they were not well stretched (Figure 3f). It was reported that the surface tension and the density of amine groups on the surface determined the degree of...

Ngày tải lên: 20/06/2014, 23:20

... Comparison of routine 13C NMR and 13C DEPT of dea-PPETE 52 Figure 2-8 2D Heteronuclear (C,H)-Correlated NMR of dea-PPETE 52 Figure 2-9 UV-Vis and emission spectra of model PPETE, dea-PPETE and tmeda-PPETE ... Loading 70 Scheme 5-1 Synthesis of amino receptor loaded phenyl building blocks 137 Scheme 5-2 Unsuccessful synthesis of dea-PPE and tmeda-PPE 139 Scheme 5-3 Synthesis of 2, 5-dibromo-thiophene-3-ylmethylamine ... batteries,32,33 and field-effect transistors.34,36 This wide range of applications is the result of the unique metallic and semiconducting properties inherent to many of these conjugated polymer systems...

Ngày tải lên: 13/11/2014, 10:54

... Conclusions and Outlook In this thesis, the synthesis and study of several important optically-active nanomaterials were presented. In Chapter and 4, I described the synthesis of a series of ZnS-related ... Estimation of the rate of disappearance of the smaller particles and the rate of formation of the larger particles 132 5.4 Summary of decay lifetimes (in picoseconds) of the excited ... SYNTHESIS AND STUDY OF NANOMATERIALS WITH TUNABLE OPTICAL PROPERTIES XU HAIRUO (B.Sc., PEKING UNIVERSITY) A THESIS SUBMITTED FOR THE DEGREE OF DOCTOR OF PHILOSOPHY DEPARTMENT OF CHEMISTRY...

Ngày tải lên: 11/09/2015, 09:11

... of plasma polymerizations for the synthesis of types of bulk and micro-/submicro-structured fluoropolymers, studies on how to control the parameters of plasma polymerization and ... images of (a) solid pp-HDHF particles polymerized under an input RF power of 200 W, system pressure of 40 Pa and glow discharge time of 45 s, and. .. to plasma polymerization of fluorinecontaining ... Polymerization and Deposition In a plasma polymerization and deposition process,... deposition of polymer films on a variety of substrates from a wide range b p of monomers and...

Ngày tải lên: 14/09/2015, 08:27

... angle of 0.030 , scanning rate of 0.04285 s−1 , and degree in range of 10–60 2.10 Mechanical Properties The mechanical properties (Young’s modulus and tensile strength) of PLA, PLA/md-HAp/PEO nanocomposites ... et al Effects of Porogen on Structure and Properties of PLA/HAp Nanocomposites (PLA/HAp) role in controlling the morphology of PLA/md-HAp/PEO nanocomposites With 20 wt% and 30 wt% of md-HAp, md-HAp ... et al Effects of Porogen on Structure and Properties of PLA/HAp Nanocomposites (PLA/HAp) (1) (3) Water contact angle images of (1) PLA, PLA/md-HAp/PEO nanocomposites (2) without and (3) with 20...

Ngày tải lên: 21/03/2017, 17:10

... 2(A)) and the average Mnof P3HT of 4500 g mol−1, the ratio between the number of P3HT chains and the number of cores was estimated to be 3.2 This suggests that the product contained about 6% of ... polystyrene standards of s-P3HT-TPA and s-P3HT-TPB were 6000 g mol−1 and 7200 g mol−1, with polydis-persity indexes (Ð) of 1.55 and 1.23, respectively The single distributions of the molecular ... Figure 8 DSC second-heating traces (exo up) of linear P3HT, s-P3HT-TPA and s-P3HT-TPB. Thermal properties of s-P3HT-TPA and s-P3HT-TPB The thermal properties of the star-shaped P3HTs were studied via...

Ngày tải lên: 17/12/2017, 15:33

... increased the polymer concentration and caused the formation of polymer films in the voids of the grid The amount of each polymer used was carefully evaluated in advance to promote formation of polymer ... / cement ratio) of approximately 0.8 and characterised by high air void contents of more than 20 vol.%, and low The influence of water contact on the mechanical properties of polymer-modified ... consists therefore of air voids, sand grains, and the cement-polymer Polymer dispersion/ solution Object slide Grid Polymer films Fig 1 (a) Polymer films with thicknesses of about 1 Am generated...

Ngày tải lên: 13/01/2020, 01:26