Pub Date : 2022-09-05DOI: 10.2116/bunsekikagaku.71.523
T. Ohshiro, Y. Aoyanagi, E. Yamada, F. Ohishi, Y. Nishimoto
As a basic study of the degradation analysis of celluloid, TG measurement and FT-IR measurement by the ATR method were performed on a celluloid sheet irradiated with a xenon lamp and ultraviolet rays, and the results were compared with the cellulose acetate sheet. Celluloid showed a decrease in the thermal decomposition start temperature, and cellulose acetate showed an increase. Information on the deterioration of the sample surface was obtained from the pyrolysis start temperature and the IR spectrum of the surface, and information on the deterioration inside the sample was obtained from the peak temperature of DTG. The results were applied to the actual sample saved. Each celluloid sample was degraded by light, and the degree of degradation was considered to be similar to the change when a 0.2 mm thick sheet was irradiated with a xenon lamp for 8 hours. By devising the measurement conditions, it was confirmed that TG/DTA measurement and celluloid sample are effective measurement methods.
{"title":"Degradation Analysis of Celluloid","authors":"T. Ohshiro, Y. Aoyanagi, E. Yamada, F. Ohishi, Y. Nishimoto","doi":"10.2116/bunsekikagaku.71.523","DOIUrl":"https://doi.org/10.2116/bunsekikagaku.71.523","url":null,"abstract":"As a basic study of the degradation analysis of celluloid, TG measurement and FT-IR measurement by the ATR method were performed on a celluloid sheet irradiated with a xenon lamp and ultraviolet rays, and the results were compared with the cellulose acetate sheet. Celluloid showed a decrease in the thermal decomposition start temperature, and cellulose acetate showed an increase. Information on the deterioration of the sample surface was obtained from the pyrolysis start temperature and the IR spectrum of the surface, and information on the deterioration inside the sample was obtained from the peak temperature of DTG. The results were applied to the actual sample saved. Each celluloid sample was degraded by light, and the degree of degradation was considered to be similar to the change when a 0.2 mm thick sheet was irradiated with a xenon lamp for 8 hours. By devising the measurement conditions, it was confirmed that TG/DTA measurement and celluloid sample are effective measurement methods.","PeriodicalId":9521,"journal":{"name":"Bunseki Kagaku","volume":null,"pages":null},"PeriodicalIF":0.2,"publicationDate":"2022-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44598404","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-09-05DOI: 10.2116/bunsekikagaku.71.483
Sayaka Nakamura, Hiroaki Sato
High-resolution mass spectrometry is a powerful method for the characterization of polymer materials, but the resulting complex mass spectra bring with it the difficulty of data analysis. Kendrick mass defect (KMD) analysis, which converts complex but informative mass spectra into a two-dimensional plot, can visualize the distribution of multiple components, and has recently attracted attention as a practical polymer characterization technique. Conventional KMD analysis is still insufficient for analysis of industrial polymer materials with complex compositions, so we have proposed several advanced KMD analysis techniques, such as resolution-enhanced KMD (RE-KMD) and remainder of KM (RKM). Sample pretreatment methods have been further developed to observe high quality matrix-assisted laser desorption ionization (MALDI) mass spectra suitable for the KMD analysis. The KMD analyses have been further expanded to other mass spectrometric techniques such as electrospray ionization (ESI)-MS, direct analysis in real time (DART)-MS, and pyrolysis-GC-MS. These achievements are expected to accelerate polymer characterization using high-resolution mass spectrometry.
{"title":"Improvement of Kendrick Mass Defect (KMD) Analysis to Accelerate the Polymer Characterization by High-resolution Mass Spectrometry","authors":"Sayaka Nakamura, Hiroaki Sato","doi":"10.2116/bunsekikagaku.71.483","DOIUrl":"https://doi.org/10.2116/bunsekikagaku.71.483","url":null,"abstract":"High-resolution mass spectrometry is a powerful method for the characterization of polymer materials, but the resulting complex mass spectra bring with it the difficulty of data analysis. Kendrick mass defect (KMD) analysis, which converts complex but informative mass spectra into a two-dimensional plot, can visualize the distribution of multiple components, and has recently attracted attention as a practical polymer characterization technique. Conventional KMD analysis is still insufficient for analysis of industrial polymer materials with complex compositions, so we have proposed several advanced KMD analysis techniques, such as resolution-enhanced KMD (RE-KMD) and remainder of KM (RKM). Sample pretreatment methods have been further developed to observe high quality matrix-assisted laser desorption ionization (MALDI) mass spectra suitable for the KMD analysis. The KMD analyses have been further expanded to other mass spectrometric techniques such as electrospray ionization (ESI)-MS, direct analysis in real time (DART)-MS, and pyrolysis-GC-MS. These achievements are expected to accelerate polymer characterization using high-resolution mass spectrometry.","PeriodicalId":9521,"journal":{"name":"Bunseki Kagaku","volume":null,"pages":null},"PeriodicalIF":0.2,"publicationDate":"2022-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42922314","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-09-05DOI: 10.2116/bunsekikagaku.71.449
Nobuyuki Kagawa
Synthetic polymers have a molecular weight distribution and, in addition, copolymers composed of multiple monomers have a compositional distribution. Differences in molecular and compositional distributions of these molecular structures in
{"title":"Characterization of Polymer Compositions by Gradient Elution HPLC","authors":"Nobuyuki Kagawa","doi":"10.2116/bunsekikagaku.71.449","DOIUrl":"https://doi.org/10.2116/bunsekikagaku.71.449","url":null,"abstract":"Synthetic polymers have a molecular weight distribution and, in addition, copolymers composed of multiple monomers have a compositional distribution. Differences in molecular and compositional distributions of these molecular structures in","PeriodicalId":9521,"journal":{"name":"Bunseki Kagaku","volume":null,"pages":null},"PeriodicalIF":0.2,"publicationDate":"2022-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42458912","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-09-05DOI: 10.2116/bunsekikagaku.71.471
Tomohiro Hirano, Hikaru Momose, Ryota Kamiike, K. Ute
Multivariate analysis was applied to nuclear magnetic resonance (NMR) spectra of methacrylate copolymers. Principal component analysis (PCA) of 13 C NMR spectra of linear copolymers of methyl methacrylate (MMA) and tert -butyl methacrylate (TBMA) successfully extracted information on chemical compositions and monomer sequences. Quantitative analysis of the chemical composition and monomer sequence was achieved by partial least-squares (PLS) regression using NMR spectra of the corresponding homopolymers and their blends as a training dataset. PCA was also useful for the extraction of information on chemical composition in branched copolymers prepared by initiator-fragment incorporation radical copolymerization of TBMA and ethylene glycol dimethacrylate with dimethyl 2,2’-azobis(isobutyrate). The chemical compositions and degree of branching were predicted by PLS regression using NMR spectra of the corresponding homopolymers, their blends and branched copolymers as a training dataset. monomer in of and benzyl methacrylate (BnMA) prepared by various polymer reactions. Furthermore, PCA of 1 H NMR spectra of linear copolymers of MMA and BnMA was applied to extract information on chemical compositions and monomer sequences. Monomer reactivity ratios were reasonably estimated from a single sample using the diad sequence distributions predicted by PLS regression.
{"title":"Determination of Chemical Composition and Monomer Sequence Distributions of Methacrylate Copolymers by Multivariate Analysis of NMR Spectra","authors":"Tomohiro Hirano, Hikaru Momose, Ryota Kamiike, K. Ute","doi":"10.2116/bunsekikagaku.71.471","DOIUrl":"https://doi.org/10.2116/bunsekikagaku.71.471","url":null,"abstract":"Multivariate analysis was applied to nuclear magnetic resonance (NMR) spectra of methacrylate copolymers. Principal component analysis (PCA) of 13 C NMR spectra of linear copolymers of methyl methacrylate (MMA) and tert -butyl methacrylate (TBMA) successfully extracted information on chemical compositions and monomer sequences. Quantitative analysis of the chemical composition and monomer sequence was achieved by partial least-squares (PLS) regression using NMR spectra of the corresponding homopolymers and their blends as a training dataset. PCA was also useful for the extraction of information on chemical composition in branched copolymers prepared by initiator-fragment incorporation radical copolymerization of TBMA and ethylene glycol dimethacrylate with dimethyl 2,2’-azobis(isobutyrate). The chemical compositions and degree of branching were predicted by PLS regression using NMR spectra of the corresponding homopolymers, their blends and branched copolymers as a training dataset. monomer in of and benzyl methacrylate (BnMA) prepared by various polymer reactions. Furthermore, PCA of 1 H NMR spectra of linear copolymers of MMA and BnMA was applied to extract information on chemical compositions and monomer sequences. Monomer reactivity ratios were reasonably estimated from a single sample using the diad sequence distributions predicted by PLS regression.","PeriodicalId":9521,"journal":{"name":"Bunseki Kagaku","volume":null,"pages":null},"PeriodicalIF":0.2,"publicationDate":"2022-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48024910","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-09-05DOI: 10.2116/bunsekikagaku.71.461
A. Takahara, R. Ishige, Tomoyasu Hirai, M. Nishibori, Y. Higaki, K. Yamazoe, Y. Harada
X-ray diffraction using tender X-rays, 3) X-ray absorption fine structure (XAFS) analysis of the formation mechanism of poly(3-hexylthiophene) (P3HT), 4) soft X-ray absorption and emission spectroscopic analysis of water structure in polyelectrolyte brushes.
{"title":"Characterization of Soft Materials by Synchrotron Radiation X-ray Based Scattering and Spectroscopic Techniques","authors":"A. Takahara, R. Ishige, Tomoyasu Hirai, M. Nishibori, Y. Higaki, K. Yamazoe, Y. Harada","doi":"10.2116/bunsekikagaku.71.461","DOIUrl":"https://doi.org/10.2116/bunsekikagaku.71.461","url":null,"abstract":"X-ray diffraction using tender X-rays, 3) X-ray absorption fine structure (XAFS) analysis of the formation mechanism of poly(3-hexylthiophene) (P3HT), 4) soft X-ray absorption and emission spectroscopic analysis of water structure in polyelectrolyte brushes.","PeriodicalId":9521,"journal":{"name":"Bunseki Kagaku","volume":null,"pages":null},"PeriodicalIF":0.2,"publicationDate":"2022-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46553403","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-08-05DOI: 10.2116/bunsekikagaku.71.411
Katsutoshi Shimizu, Masahito Ito
{"title":"Optimization Method Based on Visualization of Sensitivity and Separation Performance in HPLC","authors":"Katsutoshi Shimizu, Masahito Ito","doi":"10.2116/bunsekikagaku.71.411","DOIUrl":"https://doi.org/10.2116/bunsekikagaku.71.411","url":null,"abstract":"","PeriodicalId":9521,"journal":{"name":"Bunseki Kagaku","volume":null,"pages":null},"PeriodicalIF":0.2,"publicationDate":"2022-08-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45270093","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-08-05DOI: 10.2116/bunsekikagaku.71.425
Rimba CHRISTOPHER IMANSANTOSO, Yumiko Yoshizaki, Kayu Okutsu, Kazunori Takamine
{"title":"Measuring the Alcohol Content in Shochu Moromi by Near-infrared Spectroscopy","authors":"Rimba CHRISTOPHER IMANSANTOSO, Yumiko Yoshizaki, Kayu Okutsu, Kazunori Takamine","doi":"10.2116/bunsekikagaku.71.425","DOIUrl":"https://doi.org/10.2116/bunsekikagaku.71.425","url":null,"abstract":"","PeriodicalId":9521,"journal":{"name":"Bunseki Kagaku","volume":null,"pages":null},"PeriodicalIF":0.2,"publicationDate":"2022-08-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41267365","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-08-05DOI: 10.2116/bunsekikagaku.71.377
Takahiro Iwai
{"title":"Development of Highly Sensitive Inorganic/Organic Analytical Systems for Ultrasmall Samples Using Atmospheric Pressure Plasmas","authors":"Takahiro Iwai","doi":"10.2116/bunsekikagaku.71.377","DOIUrl":"https://doi.org/10.2116/bunsekikagaku.71.377","url":null,"abstract":"","PeriodicalId":9521,"journal":{"name":"Bunseki Kagaku","volume":null,"pages":null},"PeriodicalIF":0.2,"publicationDate":"2022-08-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49645603","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-08-05DOI: 10.2116/bunsekikagaku.71.417
Takahiro Nose, Y. Nishijima
{"title":"Design and Evaluation of Tesla Valve for Microfluidic Applications","authors":"Takahiro Nose, Y. Nishijima","doi":"10.2116/bunsekikagaku.71.417","DOIUrl":"https://doi.org/10.2116/bunsekikagaku.71.417","url":null,"abstract":"","PeriodicalId":9521,"journal":{"name":"Bunseki Kagaku","volume":null,"pages":null},"PeriodicalIF":0.2,"publicationDate":"2022-08-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43340996","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-08-05DOI: 10.2116/bunsekikagaku.71.391
M. Fukuyama, A. Hibara
{"title":"Development of the Pretreatment Method for Trace Analysis by Using Spontaneous Emulsification","authors":"M. Fukuyama, A. Hibara","doi":"10.2116/bunsekikagaku.71.391","DOIUrl":"https://doi.org/10.2116/bunsekikagaku.71.391","url":null,"abstract":"","PeriodicalId":9521,"journal":{"name":"Bunseki Kagaku","volume":null,"pages":null},"PeriodicalIF":0.2,"publicationDate":"2022-08-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42493213","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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