Pub Date : 2022-10-05DOI: 10.2116/bunsekikagaku.71.603
Miku Maeyama, K. Abiko, Yuichi Kato, E. Sudo
{"title":"Fluorescence Quenching of Raman Spectra by Carbon Materials","authors":"Miku Maeyama, K. Abiko, Yuichi Kato, E. Sudo","doi":"10.2116/bunsekikagaku.71.603","DOIUrl":"https://doi.org/10.2116/bunsekikagaku.71.603","url":null,"abstract":"","PeriodicalId":9521,"journal":{"name":"Bunseki Kagaku","volume":null,"pages":null},"PeriodicalIF":0.2,"publicationDate":"2022-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42860048","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 : 2022-10-05DOI: 10.2116/bunsekikagaku.71.579
Y. Matsumoto, Kayo Ueda, Sho Kasuga, Kazushi Enomoto, M. Kikuchi, A. Narumi, S. Kawaguchi
{"title":"Highly Accurate Determination of the Delay Volume between the MALS and Differential Refractometer in SEC","authors":"Y. Matsumoto, Kayo Ueda, Sho Kasuga, Kazushi Enomoto, M. Kikuchi, A. Narumi, S. Kawaguchi","doi":"10.2116/bunsekikagaku.71.579","DOIUrl":"https://doi.org/10.2116/bunsekikagaku.71.579","url":null,"abstract":"","PeriodicalId":9521,"journal":{"name":"Bunseki Kagaku","volume":null,"pages":null},"PeriodicalIF":0.2,"publicationDate":"2022-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45022411","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 : 2022-10-05DOI: 10.2116/bunsekikagaku.71.563
Yuka Ozeki, S. Kitagawa, H. Ohtani, Yosuke Kondo, H. Shinada
{"title":"Characterization of Styrene/n-Butyl Acrylate Copolymer by Electrospray Ionization-Ion Mobility Spectrometry-Mass Spectrometry","authors":"Yuka Ozeki, S. Kitagawa, H. Ohtani, Yosuke Kondo, H. Shinada","doi":"10.2116/bunsekikagaku.71.563","DOIUrl":"https://doi.org/10.2116/bunsekikagaku.71.563","url":null,"abstract":"","PeriodicalId":9521,"journal":{"name":"Bunseki Kagaku","volume":null,"pages":null},"PeriodicalIF":0.2,"publicationDate":"2022-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45779200","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 : 2022-10-05DOI: 10.2116/bunsekikagaku.71.549
S. Kumagai, T. Yoshioka
{"title":"Application of Pyrolysis-Gas Chromatography for the Development of Chemical Recycling Process for Plastics","authors":"S. Kumagai, T. Yoshioka","doi":"10.2116/bunsekikagaku.71.549","DOIUrl":"https://doi.org/10.2116/bunsekikagaku.71.549","url":null,"abstract":"","PeriodicalId":9521,"journal":{"name":"Bunseki Kagaku","volume":null,"pages":null},"PeriodicalIF":0.2,"publicationDate":"2022-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46923393","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 : 2022-10-05DOI: 10.2116/bunsekikagaku.71.595
Satoshi Kagami, A. Hosaka, Sadao Nakamura
{"title":"Off-flavor Analysis of Degraded Natural Rubber by Solid-Phase Microextraction - Gas Chromatography/Mass Spectrometry","authors":"Satoshi Kagami, A. Hosaka, Sadao Nakamura","doi":"10.2116/bunsekikagaku.71.595","DOIUrl":"https://doi.org/10.2116/bunsekikagaku.71.595","url":null,"abstract":"","PeriodicalId":9521,"journal":{"name":"Bunseki Kagaku","volume":null,"pages":null},"PeriodicalIF":0.2,"publicationDate":"2022-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44069504","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.71.511
Tatsuhiko Nagao, A. Yagi, Yuhki Kanda, Kuniaki Kawaguchi
and fuel swelling on the molecular mobility and higher-order structure of POM. In this study, the molecular mobility and higher-order structural changes of POM under heating and fuel swelling were analyzed using solid-state NMR, wide-angle X-ray diffraction (WAXD), and small-angle X-ray scattering (SAXS). Solid-state NMR measurements showed that the molecular mobility of all regions including crystalline to amorphous phases was enhanced under heating, while selective enhancement of molecular mobility was observed only in the amorphous and intermediate phases under fuel swelling. The results of solid-state NMR, WAXD, and SAXS measurements also confirmed that higher-order structural changes, such as increased crystallinity and increased volume of amorphous portions which occurred simultaneously due to fuel swelling.
{"title":"Molecular Mobility and Higher-Order Structural Analysis of Polyoxymethylene under Heating and Fuel Swelling","authors":"Tatsuhiko Nagao, A. Yagi, Yuhki Kanda, Kuniaki Kawaguchi","doi":"10.2116/bunsekikagaku.71.511","DOIUrl":"https://doi.org/10.2116/bunsekikagaku.71.511","url":null,"abstract":"and fuel swelling on the molecular mobility and higher-order structure of POM. In this study, the molecular mobility and higher-order structural changes of POM under heating and fuel swelling were analyzed using solid-state NMR, wide-angle X-ray diffraction (WAXD), and small-angle X-ray scattering (SAXS). Solid-state NMR measurements showed that the molecular mobility of all regions including crystalline to amorphous phases was enhanced under heating, while selective enhancement of molecular mobility was observed only in the amorphous and intermediate phases under fuel swelling. The results of solid-state NMR, WAXD, and SAXS measurements also confirmed that higher-order structural changes, such as increased crystallinity and increased volume of amorphous portions which occurred simultaneously due to fuel swelling.","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":"44991756","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.71.495
Tadatomo Kawai, Shizuka Ukita, S. Shimamoto
A gradient polymer elution chromatography (GPEC) method was developed that can separate cellulose acetate (CA) with respect to a wide range of degrees of substitution (DS). A series of cellulose acetate propionate and cellulose acetate benzoate samples were synthesized by propionylation or benzoylation of CA samples with average degrees of substitution ranging from 0.6 to 2.9, and compositionally separated using the GPEC method. The reversed-phase gradient separation based on an adsorption/desorption mechanism, a linear gradient of acetonitrile : H 2 O = 6 : 1 and ethyl acetate was used with a phenyl group-modified silica column as stationary phase. Separation of samples with different DS values was achieved for both sample series. A slight molar mass effect was observed during elution for the sample with low DS. In addition, a sharp peak at low retention time was observed for the high DS sample. Although a search for further separation systems is necessary for the determination of quantitative substitution degree distribution, this method is applicable to the determination of DS distribution over a wide DS range.
{"title":"Characterization of Chemical Heterogeneity of Cellulose Esters by Gradient Elution HPLC","authors":"Tadatomo Kawai, Shizuka Ukita, S. Shimamoto","doi":"10.2116/bunsekikagaku.71.495","DOIUrl":"https://doi.org/10.2116/bunsekikagaku.71.495","url":null,"abstract":"A gradient polymer elution chromatography (GPEC) method was developed that can separate cellulose acetate (CA) with respect to a wide range of degrees of substitution (DS). A series of cellulose acetate propionate and cellulose acetate benzoate samples were synthesized by propionylation or benzoylation of CA samples with average degrees of substitution ranging from 0.6 to 2.9, and compositionally separated using the GPEC method. The reversed-phase gradient separation based on an adsorption/desorption mechanism, a linear gradient of acetonitrile : H 2 O = 6 : 1 and ethyl acetate was used with a phenyl group-modified silica column as stationary phase. Separation of samples with different DS values was achieved for both sample series. A slight molar mass effect was observed during elution for the sample with low DS. In addition, a sharp peak at low retention time was observed for the high DS sample. Although a search for further separation systems is necessary for the determination of quantitative substitution degree distribution, this method is applicable to the determination of DS distribution over a wide DS range.","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":"48921115","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.71.501
Tadatomo Kawai, Yuzo Itoh
Poly(styrene- co -methyl acrylate): SMA, poly(styrene- co -tert butyl acrylate): StBA and poly(styrene- co -methyl methacrylate): SMMA were synthesized by reversible addition-fragmentation chain transfer (RAFT) method. The relationship between the molecular weight and the styrene content was investigated by UV–RI dual detection size-exclusion chromatography. In the SMA and StBA of short polymerization time samples, the styrene content showed a tendency to decrease from the low molecular weight region toward the high molecular weight region. On the other hand, the styrene content tended to increase from the low molecular weight region toward the high molecular weight region in the long polymerization time copolymer samples. The SMMA samples showed no trend of similar changes as SMA and StBA. We have concluded that the phenomenon may be due to the difference in the chain length dependence of the equilibrium constants for the pre-equilibrium and main-equilibrium of the RAFT process.
采用可逆加成-破碎链转移法(RAFT)合成了聚苯乙烯- co -丙烯酸甲酯:SMA、聚苯乙烯- co -丙烯酸叔丁酯:StBA和聚苯乙烯- co -甲基丙烯酸甲酯:SMMA。采用UV-RI双检测-排阻色谱法研究了分子量与苯乙烯含量的关系。在短聚合时间的SMA和StBA样品中，苯乙烯含量呈现由低分子量区向高分子量区递减的趋势。另一方面，在长聚合时间的共聚物样品中，苯乙烯的含量有从低分子量区向高分子量区增加的趋势。SMMA样品没有表现出与SMA和StBA相似的变化趋势。我们认为这种现象可能是由于RAFT过程的预平衡和主平衡的平衡常数的链长依赖性不同。
{"title":"Correlation between Molecular Weight and Chemical Composition of Poly(styrene-co-acrylate) Synthesized by RAFT Copolymerization","authors":"Tadatomo Kawai, Yuzo Itoh","doi":"10.2116/bunsekikagaku.71.501","DOIUrl":"https://doi.org/10.2116/bunsekikagaku.71.501","url":null,"abstract":"Poly(styrene- co -methyl acrylate): SMA, poly(styrene- co -tert butyl acrylate): StBA and poly(styrene- co -methyl methacrylate): SMMA were synthesized by reversible addition-fragmentation chain transfer (RAFT) method. The relationship between the molecular weight and the styrene content was investigated by UV–RI dual detection size-exclusion chromatography. In the SMA and StBA of short polymerization time samples, the styrene content showed a tendency to decrease from the low molecular weight region toward the high molecular weight region. On the other hand, the styrene content tended to increase from the low molecular weight region toward the high molecular weight region in the long polymerization time copolymer samples. The SMMA samples showed no trend of similar changes as SMA and StBA. We have concluded that the phenomenon may be due to the difference in the chain length dependence of the equilibrium constants for the pre-equilibrium and main-equilibrium of the RAFT process.","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":"42808779","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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