The Experts below are selected from a list of 30 Experts worldwide ranked by ideXlab platform
Masahiro Funabashi - One of the best experts on this subject based on the ideXlab platform.
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biodegradation of polycaprolactone powders proposed as reference test materials for international standard of biodegradation evaluation method
Journal of Polymers and The Environment, 2007Co-Authors: Masahiro Funabashi, Fumi Ninomiya, Masao KuniokaAbstract:Polycaprolactone (PCL) powders were prepared from PCL pellets using a rotation mechanical mixer. PCL powders were separated by sieves with 60 and 120 meshes into four classes; 0–125 μm, 125–250 μm, 0–250 μm and 250–500 μm. Biodegradation tests of PCL powders and cellulose powders in an aqueous solution at 25°C were performed using the coulometer according to ISO 14851. Biodegradation tests of PCL powders and cellulose powders in controlled compost at 58°C were performed by the Mitsui Chemical Analysis and Consulting Service, Inc. according to ISO 14855-1 and by using the Microbial Oxidative Degradation Analyzer (MODA) instrument according to ISO/DIS 14855-2. PCL powders were faster biodegraded than cellulose powders. The reproducibility of biodegradation of PCL powders is excellent. Differences in the biodegradation of PCL powders with different class were not observed by the ISO 14851 and ISO/DIS 14855-2. An enzymatic degradation test of PCL powders with different class was studied using an enzyme of Amano Lipase PS. PCL with smaller particle size was faster degraded by the enzyme. PCL powders with regulated sizes from 125 μm to 250 μm are proposed as a reference material for the biodegradation test.
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biodegradation of poly lactic acid powders proposed as the reference test materials for the international standard of biodegradation evaluation methods
Polymer Degradation and Stability, 2006Co-Authors: Masao Kunioka, Fumi Ninomiya, Masahiro FunabashiAbstract:Abstract The methods for producing reference test materials for biodegradation evaluation tests have been studied. Mechanical crushing at low temperature of polymer pellets using dry ice was selected for the method of producing polymer powder of poly(lactic acid) (PLA). The powders were fractionated using 60 mesh (250 μm) and 120 mesh (125 μm) sieves. The size distributions were then measured. The average diameter of the PLA particles obtained by this method was 214.2 μm. The biodegradation speeds of these PLA polymer powders were evaluated by two methods based on the international standard and one in vitro method based on the enzymatic degradation. First, the degree of biodegradation for this PLA powder was 91% for 35 days in a controlled compost determined by a method based on ISO 14855-1 (JIS K6953) at 58 °C managed by the Mitsui Chemical Analysis and Consulting Service, Inc. (Japan). Second, these polymer powders were measured for biodegradation by the Microbial Oxidative Degradation Analyzer (MODA) in a controlled compost at 58 °C and 70 °C based on ISO/DIS 14855-2 under many conditions. The degree of biodegradation for this PLA powder was approximately 80% for 50 days. In addition, the polymer powders were biodegraded by Proteinase K which is a PLA degradation enzyme. This polymer powder was suitable as a reference material for the evaluation methods of biodegradation.
Masao Kunioka - One of the best experts on this subject based on the ideXlab platform.
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biodegradation of polycaprolactone powders proposed as reference test materials for international standard of biodegradation evaluation method
Journal of Polymers and The Environment, 2007Co-Authors: Masahiro Funabashi, Fumi Ninomiya, Masao KuniokaAbstract:Polycaprolactone (PCL) powders were prepared from PCL pellets using a rotation mechanical mixer. PCL powders were separated by sieves with 60 and 120 meshes into four classes; 0–125 μm, 125–250 μm, 0–250 μm and 250–500 μm. Biodegradation tests of PCL powders and cellulose powders in an aqueous solution at 25°C were performed using the coulometer according to ISO 14851. Biodegradation tests of PCL powders and cellulose powders in controlled compost at 58°C were performed by the Mitsui Chemical Analysis and Consulting Service, Inc. according to ISO 14855-1 and by using the Microbial Oxidative Degradation Analyzer (MODA) instrument according to ISO/DIS 14855-2. PCL powders were faster biodegraded than cellulose powders. The reproducibility of biodegradation of PCL powders is excellent. Differences in the biodegradation of PCL powders with different class were not observed by the ISO 14851 and ISO/DIS 14855-2. An enzymatic degradation test of PCL powders with different class was studied using an enzyme of Amano Lipase PS. PCL with smaller particle size was faster degraded by the enzyme. PCL powders with regulated sizes from 125 μm to 250 μm are proposed as a reference material for the biodegradation test.
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biodegradation of poly lactic acid powders proposed as the reference test materials for the international standard of biodegradation evaluation methods
Polymer Degradation and Stability, 2006Co-Authors: Masao Kunioka, Fumi Ninomiya, Masahiro FunabashiAbstract:Abstract The methods for producing reference test materials for biodegradation evaluation tests have been studied. Mechanical crushing at low temperature of polymer pellets using dry ice was selected for the method of producing polymer powder of poly(lactic acid) (PLA). The powders were fractionated using 60 mesh (250 μm) and 120 mesh (125 μm) sieves. The size distributions were then measured. The average diameter of the PLA particles obtained by this method was 214.2 μm. The biodegradation speeds of these PLA polymer powders were evaluated by two methods based on the international standard and one in vitro method based on the enzymatic degradation. First, the degree of biodegradation for this PLA powder was 91% for 35 days in a controlled compost determined by a method based on ISO 14855-1 (JIS K6953) at 58 °C managed by the Mitsui Chemical Analysis and Consulting Service, Inc. (Japan). Second, these polymer powders were measured for biodegradation by the Microbial Oxidative Degradation Analyzer (MODA) in a controlled compost at 58 °C and 70 °C based on ISO/DIS 14855-2 under many conditions. The degree of biodegradation for this PLA powder was approximately 80% for 50 days. In addition, the polymer powders were biodegraded by Proteinase K which is a PLA degradation enzyme. This polymer powder was suitable as a reference material for the evaluation methods of biodegradation.
Fumi Ninomiya - One of the best experts on this subject based on the ideXlab platform.
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biodegradation of polycaprolactone powders proposed as reference test materials for international standard of biodegradation evaluation method
Journal of Polymers and The Environment, 2007Co-Authors: Masahiro Funabashi, Fumi Ninomiya, Masao KuniokaAbstract:Polycaprolactone (PCL) powders were prepared from PCL pellets using a rotation mechanical mixer. PCL powders were separated by sieves with 60 and 120 meshes into four classes; 0–125 μm, 125–250 μm, 0–250 μm and 250–500 μm. Biodegradation tests of PCL powders and cellulose powders in an aqueous solution at 25°C were performed using the coulometer according to ISO 14851. Biodegradation tests of PCL powders and cellulose powders in controlled compost at 58°C were performed by the Mitsui Chemical Analysis and Consulting Service, Inc. according to ISO 14855-1 and by using the Microbial Oxidative Degradation Analyzer (MODA) instrument according to ISO/DIS 14855-2. PCL powders were faster biodegraded than cellulose powders. The reproducibility of biodegradation of PCL powders is excellent. Differences in the biodegradation of PCL powders with different class were not observed by the ISO 14851 and ISO/DIS 14855-2. An enzymatic degradation test of PCL powders with different class was studied using an enzyme of Amano Lipase PS. PCL with smaller particle size was faster degraded by the enzyme. PCL powders with regulated sizes from 125 μm to 250 μm are proposed as a reference material for the biodegradation test.
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biodegradation of poly lactic acid powders proposed as the reference test materials for the international standard of biodegradation evaluation methods
Polymer Degradation and Stability, 2006Co-Authors: Masao Kunioka, Fumi Ninomiya, Masahiro FunabashiAbstract:Abstract The methods for producing reference test materials for biodegradation evaluation tests have been studied. Mechanical crushing at low temperature of polymer pellets using dry ice was selected for the method of producing polymer powder of poly(lactic acid) (PLA). The powders were fractionated using 60 mesh (250 μm) and 120 mesh (125 μm) sieves. The size distributions were then measured. The average diameter of the PLA particles obtained by this method was 214.2 μm. The biodegradation speeds of these PLA polymer powders were evaluated by two methods based on the international standard and one in vitro method based on the enzymatic degradation. First, the degree of biodegradation for this PLA powder was 91% for 35 days in a controlled compost determined by a method based on ISO 14855-1 (JIS K6953) at 58 °C managed by the Mitsui Chemical Analysis and Consulting Service, Inc. (Japan). Second, these polymer powders were measured for biodegradation by the Microbial Oxidative Degradation Analyzer (MODA) in a controlled compost at 58 °C and 70 °C based on ISO/DIS 14855-2 under many conditions. The degree of biodegradation for this PLA powder was approximately 80% for 50 days. In addition, the polymer powders were biodegraded by Proteinase K which is a PLA degradation enzyme. This polymer powder was suitable as a reference material for the evaluation methods of biodegradation.
Mitsuteru Mutsuda - One of the best experts on this subject based on the ideXlab platform.
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Applying the Technical Results and Experience from Unsuccessful Projects in New Projects: Kuraray and the Innovation of Nylon 9T
2018 Portland International Conference on Management of Engineering and Technology (PICMET), 2018Co-Authors: Mitsuteru MutsudaAbstract:One of the big challenge of Innovation management is, how to manage the contingencies and uncertainties. Actually it is impossible to obviate any contingencies and uncertainties from an innovation processes. One of the solutions could be applying technical results and experiences from unsuccessful projects to new projects. Genestar® is a kind of "Aromatic Nylon = High heat resistance Nylon" and the start of the business was 1999. Although the demand of "High heat resistance Nylon" was being increased at that time, Dupont(= Nylon 6T, 1994), Solvay(= Nylon 6T, 1991), Mitsui Chemical(= Nylon 6T, 1989) and Mitsubishi Gas Chemical (= Nylon MXD6, 1983) had already started the business five to ten years earlier. In addition, Kuraray had not had any Engineering Plastics business at that time, i.e. Kuraray was a newcomer in both technical area and business area. Under the difficult situation, Genestar® has gotten a big success, the business has reached to 14,000 ton in 2017. This paper picks up Kuraray's Genestar® (Nylon 9T) as the example and it discusses about how Kuraray made Genestar® succeed by applying technical results and experiences from two withdrawn, terminated projects, (a) Polybutylene terephthalate (PBT) project, (b) nonan diamine project, which are based on different technical areas.
Ana María Martín Casado - One of the best experts on this subject based on the ideXlab platform.
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Comparison of two color-difference formulas using the Bland-Altman approach based on gingiva color space.
Odontology, 2018Co-Authors: Cristina Gómez Polo, Javier Montero, Ana María Martín CasadoAbstract:The objectives of this study were to determine the relationship between the results provided by the classical CIELab (ΔEab*) and the CIEDE2000 (ΔE00) formulas and the gingival color space using the Bland and Altman limits of agreement, to use this relationship to establish the equivalences between the gingival color thresholds of perceptibility of both formulas, and to evaluate whether the relationship between ΔEab* and ΔE00 is modified depending on the axis in which the changes occur. The means of the L*, a*, and b* coordinates of the 21 gingiva porcelain samples (Heraceram, Heraeus Kulzer Mitsui Chemical Groups) were used and the differences in color were calculated in 210 pairs of samples using the CIELab (ΔE*ab) and CIEDE2000 (ΔE00) color-difference formulas. The results obtained with these formulas were compared and the limits of agreement after a logarithmic transformation of the data were obtained. The relationship between both formulas was ln ΔE00 = - 0.22 + ln ΔEab*. The results obtained with the CIELab formula were between 1.01 (95% confidence interval 0.98-1.03) and 1.54 (95% confidence interval 1.52-1.59) times higher than those obtained with the CIEDE200 formula. In the gingiva color space, the scale factor between the CIEDE2000 and CIELab values changes from 0.63 to 1.02, such that providing an accurate scale factor between both values proves difficult. The pairs with the highest ratio were those where the difference in color was mainly due to changes in lightness, whereas the pairs with the smallest ratio were those where the difference in color was mainly due to changes in the blue-yellow or green-red axes.