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Volume 67, Issue 3
Displaying 1-6 of 6 articles from this issue
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Accounts
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Misako KOMATSU, Yuhei TANAKA, Yuko NISHIMOTOArticle type: Accounts
2018 Volume 67 Issue 3 Pages 131-134
Published: March 05, 2018
Released on J-STAGE: April 05, 2018
JOURNAL FREE ACCESSFocusing on waste biomass made from wood-based waste as a raw material, in order to effectively utilize charcoal, such as construction waste, sawdust, cotton linters, etc. as a VOC adsorbent in a room, thermogravimetric analysis and headspace Gas Chromatography as well as evolved gas analysis were used to evaluate the VOC adsorption properties. This method can be evaluated with about 10 mg of carbonized biomass and a VOC of 1 μL or less, which is an effective evaluation method. The characteristics of carbonized biomass vary depending on the raw material. The VOC adsorption properties also differed depending on the raw materials, and the construction waste charcoal was found to be effective as an adsorbent for aromatic compounds, such as benzene.View full abstractDownload PDF (614K) -
Takahisa TSUGOSHIArticle type: Accounts
2018 Volume 67 Issue 3 Pages 135-143
Published: March 05, 2018
Released on J-STAGE: April 05, 2018
JOURNAL FREE ACCESSEvolved gas analysis, which is widely known as TG/MS, is a method to detect gaseous species generated by thermal decomposition, which is expected to apply to a wide range of samples. However capillary connection well-used for TG/MS between TG and MS, sometimes leads to a blockade due to the adsorption of the gaseous is which species by thermal decomposition. This means that there is no guarantee to transfer the gaseous species without any change. GC has the same situation; further, real-time monitoring is impossible. In this study, for the solution, the development of new type of interface, prototype making with fragmentless ionization MS, and its applications were carried out; a process monitoring of polymer material as binder in ceramic starting material has been realized. Further, it offers a suggestion of fact-model for the thermal decomposition of polystyrene against the known model.View full abstractDownload PDF (3167K) -
Hiroki UEHARA, Ayako MASUDA, Takeshi YAMANOBEArticle type: Accounts
2018 Volume 67 Issue 3 Pages 145-151
Published: March 05, 2018
Released on J-STAGE: April 05, 2018
JOURNAL FREE ACCESSA novel methodology for comparing in-situ X-ray measurements during heating and thermal analyses was developed for polymeric materials, including polypropylene and poly(lactic acid). The differential curve of the intensity change as a function of the temperature is well coincident with the melting profile obtained by a differential scanning calorimeter (DSC). This methodology is especially advantageous for analyses of DSC profiles containing multiple melting peaks or duplicated melting/crystallization peaks. The latent endothermic or exothermic peak for different crystalline forms could be evidenced within the multiple DSC profile. These results suggest that the combination with in-situ measurements is notably effective for a full availability of information obtainable from thermal analyses.View full abstractDownload PDF (1190K)
Notes
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Takehisa YOSHIMI, Hiroki FUJIMORIArticle type: Notes
2018 Volume 67 Issue 3 Pages 153-158
Published: March 05, 2018
Released on J-STAGE: April 05, 2018
JOURNAL FREE ACCESSStructural analyses are indispensable for elucidating liquid crystal phases; however, standard techniques, such as X-ray analysis, Raman, IR, and NMR, have some limitation due to its fluidity. It also requires accurate temperature control since a liquid crystal phase transition only occurs at a specific temperature. In this study, simultaneous differential scanning calorimetry (DSC)-Raman measurements were performed on N-(4-methoxybenzylidene)-4-butylaniline (MBBA), which is known to be a thermotropic liquid crystal. We showed, together with macroscopic information from DSC and microscopic information on the molecular vibration from Raman spectrum analysis can be obtained. From a detailed analysis (from careful examinations), the results suggested that in the process of phase transitions, intermolecular and intramolecular interactions are not transforming uniformly, but different processes for each fragment in the molecule are occurring.View full abstractDownload PDF (684K) -
Shigeki MOCHIDA, Ayumu ENDO, Eita SHIMODA, Yuko NISHIMOTOArticle type: Notes
2018 Volume 67 Issue 3 Pages 159-162
Published: March 05, 2018
Released on J-STAGE: April 05, 2018
JOURNAL FREE ACCESSMethylcellulose (MC) hydrogels, which are thermos-reversible heating gels, can control the gelation temperature by adding PEG or salt. In the gelation process, the methoxy group of MC forms a crosslinking point by a PEG-mediated hydrophobic interaction, and becomes a gel state. When the temperature increases, the PEG on the crosslinking point separates and networks are formed by hydrophobic interaction between the MCs. There are two steps where an interaction occurs. Since the heat change due to gelation is very small, the application of a newly developed high-sensitivity large-capacity sample container for examination by DSC was examined. A clear endothermic peak was observed, and it was found that the endothermic peak of gelation at the second stage due to the addition of PEG or alkali chloride, was also lower than that of MC hydrogel, and further decreased with the addition amount. On the other hand, it was found that there was hardly any difference depending on the type of alkali metal ion of alkali chloride.View full abstractDownload PDF (687K)
Analytical Reports
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Yuji MISHIMA, Takahisa TSUGOSHIArticle type: Analytical Reports
2018 Volume 67 Issue 3 Pages 163-167
Published: March 05, 2018
Released on J-STAGE: April 05, 2018
JOURNAL FREE ACCESSEvolved gas analysis using thermal decomposition has been carried out for styrene random/block copolymers using TG-DTA/PI-QMS with the skimmer interface. The system configuration should be advantageous for the performance of real-time measurements for each molecular species. In this system, the discrimination of styrene random/block copolymers can be achieved while monitoring m/z 104. The thermal decomposition of polymers with polystyrene segment shows that the profile of m/z 104 has sharply increased in a certain temperature range, although styrene/butadiene random copolymers and 1,2-polybutadiene do not have a similar profile.View full abstractDownload PDF (978K)
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