Thermal stability improvement

The results suggest that the thermal stability improves with higher loading till 6 phr of nanoclay and this improvement is attributed to the barrier effect of the exfoliated and the intercalated nanoclay particles. 

High-impact strength, solvent resistance, and improved thermal stability Improved impact strength, heat resistance, rigidity, and appearance Superior mechanical properties High-impact strength... 

Thermal measurements such as DSC and DTA can be used to determine the crystal collapse temperature. The presence of the exothermic peak is associated with the lattice collapse. As shown in Figure 4.44 for a steamed and unsteamed faujasite, the thermal stability improves with increasing silica/alumina framework. 

Leszczynska, A., Njuguna, J., Pielichowski, K., and Banerjee, J. R. (a) Polymer/montmorillonite nanocomposites with improved thermal properties, Part I Factors influencing thermal stability and mechanisms of thermal stability improvement, Thermochim. Acta (2007), 453, 75-96. (b) Polymer/montmorillonite nanocomposites with improved thermal properties. Part II Thermal stability of montmorillonite nanocomposites based on different polymeric matrixes, Thermochim. Acta (2007), 454, 1-22. 

The effect of PEG on thermal stability of the mesostructured Ce02 powders has been observed by comparing the difference of properties between the samples CPN-2 and CN. Figure 10 shows the small angle XRD patterns of the samples CPN-2 and CN. After calcination at 673K, the low-angle diffraction peak in the XRD pattern of CN disappeared, but still existed in that of CPN-2. This may be attributed to the thermal stability improvement deriving from non-ionic surfactant PEG. 

Mg(OHl PA PBB PA EEA TGA Weight loss TGA TG Chains scission due to hydrolysis Substantially lower weight loss up to 20% filler Reduced thermal stability Improved thermal stability 52 66 70 61... 

Song, C., W.-C. Lai, and H. H. Schobert. Hydrogen-Transferring Pyrolysis of Long-Chain Alkanes and Thermal Stability Improvement of Jet Fuels by Hydrogen Donors. Ind. Eng. Chem. Res., 1994, 33 (3), 548-557. 

In previously reported stability work with shale oil derived jet fuels (16) it was shown that the JFTOT thermal stability improved as the total nitrogen content decreased. In Table III, it is observed that the thermal stability of the Shale-I fuel improves as the concentration of basic nitrogen compounds decreases. In previous work (16) the lower nitrogen contents of the shale oil jet fuels were achieved by more severe hydrotreatment. 

TaN Cap Process for Cu Corrosion Prevention and Thermal Stability Improvement... 

Kanezashi M, O Brien J, Lin YS. Template-free synthesis of MFI-type zeolite membranes Permeation characteristics and thermal stability improvement of membrane structure. J Membr Sci 2006 286(1-2) 213-222. 

PC ASA, or AAS Baitaloy Hitachi Chmn. high- High impact strength, thermal stability, improved... 

The addition of unmodified MWCNTs has a negative effect on thermal stability of the epoxy nanocomposites. This is due to the poor affinity between as-received MWCNTs and epoxy resin matrix, which increases vacancies or voids in the nanocomposite. However, the addition of amine-modified MWCNTs enhances the values of the first and second decomposition temperatures, which indicates the thermal stability improvement of the nanocomposite. The reason may be attributed to the fact that amine-modified MWCNTs have a better affinity for the polymer matrix than unmodified MWCNTs. Similar results are reports from Yang and Gu [51] using modified MWCNTs. TGA analysis indicates the thermal stabiUly improvement of the epoxy/MWCNTs nanocomposite. The reason may be due to the fact that triethylenetetramine TETA-grafted MWCNTs possess a good affinity to the epoxy matrix. The incorporation of functionalized CNTs into resin promoted the thermal stability and flame retardancy of the epoxy. 

Woranuch S, Yoksan R. Eugenol-loaded chitosan nanopaiticles I. Thermal stability improvement of eugenol through encapsulation. Carbohydr Polym. 2012 96(2) 578-85. 

Other thermally stable organoclays for atom transfer radical polymerization were considered DCTBAB and PCDBAB (Table 3.5) [64], Organoclays were used to prepare nanocomposites by polymerization of styrene in bulk. The thermal stability of the nanocomposites decreased as the clay loading increased, because of the competing effects of the number of attached chains relative to the unattached chains, level of clay exfoliation, and clay distribution. The overall thermal stability improved slightly. 

Copolymerization is the one way to synthesize polymeric materials with desired properties and functions. The cyclic carbonate monomers are successfully copolymerized with various cyclic monomers, such as cyclic carbonates, lactones with/without substituents, lactide, and cyclic phosphates. TMC was copolymerized with lactide by PPL to produce poly(lactide-co-TMC)s having carbonate contents from 0 to 100% and having molecular weights of up to 21000. The glass transition temperature (Tg) of the copolymer was dependent on the carbonate content, and the Tg values linearly decreased from 35° (polylactide) to - 8° [poly(TMC)] [47]. TMC was also copolymerized with medium to large ring-sized lactones. As an example, TMC was copolymerized with PDL in toluene by lipase CA at 70 °C to yield random copolymers [135]. All the poly(PDL-TMC)s were highly crystalline, even those with an equimolar comonomer content and close-to-random distribution. Thermal stability improves with randomization of the comonomer distribution [136]. 

Commercial fluoropolymers are based on TFE, vinylidene fluoride, and, to a lesser extent, CTFE. Examples of other comonomers include perfluoro-methyl vinyl ether, perfluoroethyl vinyl ether, PPVE, HFP, CTFE, and perfluorobutyl ethylene. The general consequences of the substitution of fluorine for hydrogen in a polymer include increased chemical and solvent resistance, enhanced electrical properties such as lower dielectric constant, lower coefficient of friction, higher melting point, increased photostability and thermal stability, improved flame resistance and weakened mechanical properties. The ultimate, most useful and sought-after properties are achieved in perfluorinated polymers. 

Instead, these type of flame retardants exhibit some drawbacks compared with bromine-containing flame retardants, such as low flame retardant efficiency and low thermal stability. Improved intumescent flame retardant systems have been found by formulating with zeolites and organoboron siloxanes (9). 

It has already been reported that the diermal stability of invertase improves upon enzyme concentration increase and inclusion fixation into PVA gel membrane [15]. Thermal stability improves upon fixation. Multifunctional alcohol also contributes to improvement in stability [11, 16]. The PVA is a kind of multifunctional alcohol and invertase is a typical polysaccharide having about a 50%-saccharide chain [17]. The thermal stability of the enzyme is probably improved by the stabilizing effect of the higher-order structure due to interaction between die hydroxyl groups and the water molecules included in the PVA and the polysaccharide chain. 

For PE-HD/MDH/PE-g-MA composites, the degradation processes of these composites also confirm two steps. Addition of PE-g-MA enhanced the thermal stability only of PE-HD/MDH 1/PE-g-MA composites, shifting the TGA curves to higher temperature. The first step of MDHl decomposition all delayed in these PE-HD/MDHl/ PE-g-MA composites. At the same time, there is the thermal stability improvement at second step in the presence of polymer coupling agent. Therefore, the presence of PE-g-MA in PE-HD/MDH 1/PE-g-MA composites exhibited higher degradation temperatures than that of PE-HD/MDHl composites. 

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