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swelling ability and behaviour of bentonite-based materials for deep repository engineered barrier systems:Influence of physical,chemical and thermal factors

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Journal of Rock Mechanics and Geotechnical Engineering 2022年第3期14卷 689-702页

作者： Mohammed Alzamel Mamadou Fall Sada Haruna Department of Civil Engineering University of OttawaOttawaOntarioK1N 6N5Canada

Compacted bentonite-sand(B/S)mixtures have been used as a barrier material in engineered barrier systems(EBSs)of deep geological repositories(DGR)to store nuclear *** study investigates the individual and combined effects of different chemical compositions of deep groundwaters(chemical factor)at potential repository sites in Canada(the Trenton and Guelph regions in Ontario),heat generated in DGRs(thermal factor),dry densities and mass ratios of bentonite and sand mixtures(physical factors)on the swelling behavior and ability of bentonite-based *** this study,swelling tests are conducted on B/S mixtures with different B/S mix ratios(20/80 to 70/30),compacted at different dry densities(ρd=1.6-2 g/cm^(3)),saturated with different types of water(distilled water and simulated deep groundwater of Trenton and Guelph)and exposed to different temperatures(20℃-80℃).Moreover,scanning electron microscopy(SEM)analyses,mercury intrusion porosimetry(MIP)tests and X-ray diffractometry(XRD)analyses are carried out to evaluate the morphological,microstructural and mineralogical characteristics of the B/S *** test results indicate that the swelling potential of the B/S mixtures is significantly affected by these physical and chemical factors as well as the combined effects of the chemical and thermal factors.A significant decrease in the swelling capacity is observed when the B/S materials are exposed to the aforementioned groundwaters.A large decrease in the swelling capacity is observed for higher bentonite content in the ***,higher temperatures intensify the chemically-induced reduction of the swelling capacity of the B/S barrier *** decrease in the swelling capacity is caused by the chemical and/or microstructural changes of the *** results from this research will help engineers to design and build EBSs for DGRs with similar groundwater and thermal conditions.

关键词： Deep geological repository Engineered barrier Bentonite-sand materials Nuclear waste swelling capacity swelling strain

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PHASE EQUILIBRIUM FOR THE TERNARY SYSTEM VINYL CHLORIDE-CHLORINATED POLYETHYLENE-POLY(VINYL CHLORIDE)

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Chinese Journal of Polymer Science 1991年第3期9卷 238-245页

作者：楼剑锋翁志学黄志明潘祖仁 Chemical Engineering Department Zhejiang University Hangzhou 310027

swelling capacity of vinyl chloride (VC) in chlorinated polyethylene (CPE) with 25—40 wt% Cl at temperature 30—57℃ was studied and their relationships were correlated with Langmuir and Freundlich adsorption equations. A ternary phase diagram for VC-CPE-PVC was also established. In-situ polymerization conditions of CPE-g-VC were proposed and CPE content control was analyzed for the manufacturing process of CPE-g-VC graft product based on results of phase equilibrium study.

关键词： Phase equilibrium swelling capacity Ternary system diagram Vinyl chloridechlorinated polyethylene-poly (vinyl chloride)

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Acetylation of Starch Extracted from Rejected Fruits of <i>Musa ×paradisiaca L.</i>to Obtain a Pharmaceutical Disintegrant

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Pharmacology & Pharmacy 2020年第6期11卷 118-126页

作者： Karla Dumancela Eduardo Mayorga Javier Santamaría- Aguirre Facultad de Ciencias Químicas Universidad Central del Ecuador Quito Ecuador Instituto de Investigación en Salud Pública y Zoonosis CIZ Universidad Central del Ecuador Quito Ecuador

There are many natural sources to obtain pharmaceutical grade starch, one of which is banana (Musa × paradisiaca L.);nevertheless, the use of native starch has certain disadvantages compared to modified starches, whose disintegrating properties are better. In this study, starch extracted from rejected fruits of Musa × paradisiaca L., was modified by acetylation, under the following optimized experimental conditions: 130 mL acetic anhydride, 3 mL sodium hydroxide 50% p/v for each 15 grams of native starch, at 123℃ during 3 hours. The reaction resulted in a modified green banana starch with twice as much swelling capacity compared to unmodified (native) starch;acetylation was verified by infrared spectroscopy and degree of substitution of acetyl groups by back titration. The dissolution profiles of Ibuprofen tablets made with banana modified starch and commercial disintegrant, have no differences according with their similarity factor, f2. It is concluded that it is feasible to use green banana starch modified through acetylation as a pharmaceutical disintegrant.

关键词： Modified Banana Starch Acetylation swelling capacity Disintegrant Dissolution Profile

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扩链剂对聚氨酯弹性体耐化学介质性能的影响

扩链剂对聚氨酯弹性体耐化学介质性能的影响

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2014年全国高分子材料科学与工程研讨会

作者：姜志发辛浩波韩文橡塑材料与工程教育部重点实验室青岛科技大学功能高分子研究所

目前,功能型聚氨酯弹性体材料(耐热、耐溶剂、阻燃、抗静电等)的开发与研制已成为聚氨酯弹性体发展的方向和热点,其中耐化学介质聚氨酯弹性体由于在印刷及涂覆等行业中有大量的需求而备受关注。高分子材料在介质中的破坏过程是物理作用... 详细信息

目前,功能型聚氨酯弹性体材料(耐热、耐溶剂、阻燃、抗静电等)的开发与研制已成为聚氨酯弹性体发展的方向和热点,其中耐化学介质聚氨酯弹性体由于在印刷及涂覆等行业中有大量的需求而备受关注。高分子材料在介质中的破坏过程是物理作用与化学作用的综合结果。首先介质分子渗透、扩散进入材料内部,与大分子链段相互作用,破坏大分子的次价键,使材料溶胀、软化,材料中的配合剂溶解、溶出,同时在活性介质作用下,介质分子

关键词： polyurethane elastomer chemical medium-resistance chain extender swelling capacity

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