CO_2基脂肪族聚碳酸酯和环氧树脂共混体系的研究

本文对CO2 基脂肪族聚碳酸酯 环氧树脂共混体系进行了研究。采用示差扫描量热分析、热重分析法考察了该共混体系的相分离状况及耐热性 ,并对其力学性能进行了测试     

高密度聚乙烯／聚碳酸酯共混体系性能的初步研究

本文介绍发不同牌号高密度聚乙烯和聚碳酸酯对ＨＤＰＥ／ＰＣ共混物性能的影响结果。同时以ＰＥ接枝马来酸酐和自ＰＥ接枝烯丙基双酚Ａ醚及ＰＥ接枝烯丙基双酚Ａ作为增容剂，研究了不同增容剂、ＰＣ含量和增容剂含量对ＨＤＰＥ／ＰＣ共混物力学和热性能的影响。     

共混方式对高密度聚乙烯＼聚碳酸酯共混体系形状与性能的影响

研究了不同共混主式对高密度聚乙烯／聚碳酯共混体系形成与性能的影响。将不同组成的ＨＤＰＥ／ＰＣ分别在双螺杆、单螺杆挤出机中共混后注射成型,测试注射条的力学性能并用扫描电子显微对样条断面进行形态观察。     

聚碳酸酯共混体系的研究进展

聚碳酸酯品种较多,作为工程材料最有价值的是双酚A型聚碳酸酯,其主要缺点是易开裂,熔体粘度高,成型加工较困难,为此进行了各种改性方法。聚碳酸酯共混改性体系由于其优良物理机械性能成为目前研究和应用较广的一种聚合物共混体系。就近几年来国内外聚碳酸酯共混体系机械性能与形态研究的进展情况作扼要综述,并对其发展前景进行了展望。     

聚碳酸酯的共混改性

聚碳酸酯是一种综合性能优良的工程塑料。本文主要介绍了国内聚碳酸酯共混改性的进展情况。聚碳酸酯(PC)具有突出的韧性、优良的电绝缘性,宽广的使用温度范围和尺寸稳定性,是一种综合性能优良的工程塑料。因此,它被广泛用于制造纺织器材、机械零     

国内外聚碳酸酯的共混改性

介绍了国内外聚碳酸酯（ＰＣ）的共混改性研究状况，并探讨了ＰＣ共混改性今后的发展趋势。     

聚碳酸酯/聚乳酸共混体系的研究进展

概述了国内外聚碳酸酯/聚乳酸共混体系的开发应用现状,包括聚碳酸酯/聚乳酸共混体系的相容技术、添加剂的选择及影响共混体系性能的因素(如原料的选择、组分的配比、制备方法等).对该共混体系的发展方向作了简要分析,目前需要解决的问题有:两种材料的相容技术,优化制备工艺,开发适用不同领域的聚碳酸酯/聚乳酸共混体系,降低开发和生产成本.     

聚碳酸酯共混物增容改性的研究

综述了近年来聚碳酸酯与丙烯腈－丁二烯－苯乙烯共聚物、聚酯、液晶高分子、聚酰胺和聚烯烃等共聚物的研究现状。采用官能团化大分子作为共混物的相容剂或者作为改性组分是聚碳酸酯共混物改性的主要发展方向，增容聚碳酸酯共混物的分散相尺寸变小、界面粘结加强，物理与力学性能改善。讨论了聚碳酸酯共混物中的增容机理。     

聚碳酸酯与聚乙烯共混物性能的研究

本文研究了聚碳酸酯(简称PC)与聚乙烯(简称PE)共混体系的机械性能、流变性能以及热性能。实验结果表明:PC与PE共混体系是一种具有优异性能的塑料合金材料,这种合金材料具有一定的实用性和经济性。     

一步法制备纳米SiO_2/环氧树脂杂化材料的研究

以正硅酸乙酯(TEOS)为无机前驱体、三乙烯四胺(TETA)为固化剂和γ-氨丙基三乙氧基硅烷(KH-550)为硅烷偶联剂,采用溶胶-凝胶一步法制备SiO2/EP(环氧树脂)杂化材料。研究了TEOS和丙酮含量对杂化材料的力学性能、热性能等影响,并对杂化材料的微观相态结构和性能进行了表征和分析。结果表明:当w(TEOS)=3%(相对于改性EP质量而言)时,不加丙酮的杂化材料具有相对最好的综合性能,其断面形貌呈韧性断裂,热变形温度和玻璃化转变温度均高于纯EP体系,生成的SiO2粒径为20 nm左右且分布较均匀;加入丙酮后的杂化材料透明性变好,但其力学强度和热性能均随丙酮含量增加而降低。     

CO2—21世纪的新碳源

本文对21世纪的一种新碳源CO     

Adsorption of CO2 from dry gases on MCM-41 silica at ambient temperature and high pressure. 2: Adsorption of CO2/N2, CO2/CH4 and CO2/H2 binary mixtures

Adsorption equilibrium capacity of CO₂, CH₄, N₂, H₂ and O₂ on periodic mesoporous MCM-41 silica was measured gravimetrically at room temperature and pressure up to 25 bar. The ideal adsorption solution theory (IAST) was validated and used for the prediction of CO₂/N₂, CO₂/CH₄, CO₂/H₂ binary mixture adsorption equilibria on MCM-41 using single components adsorption data. In all cases, MCM-41 showed preferential CO₂ adsorption in comparison to the other gases, in agreement with CO₂/N₂, CO₂/CH₄, CO₂/H₂ selectivity determined using IAST. In comparison to well known benchmark CO₂ adsorbents like activated carbons, zeolites and metal-organic frameworks (MOFs), MCM-41 showed good CO₂ separation performances from CO₂/N₂, CO₂/CH₄ and CO₂/H₂ binary mixtures at high pressure, via pressure swing adsorption by utilizing a medium pressure desorption process (PSA-H/M). The working CO₂ capacity of MCM-41 in the aforementioned binary mixtures using PSA-H/M is generally higher than 13X zeolite and comparable to different activated carbons.     

CaC03纳米粉填充环氧树脂分散技术研究

探讨了CaCO3纳米粉填充环氧树脂的均匀分散技术。采用超声波振动和对CaCO3纳米粉进行硅烷偶联处理两种方法，改进CaCO3在环氧树脂中的分散效果。扫描电镜观察表明，以上两种方法比普通搅拌混合效果显著，实现了CaCO3纳米粉在环氧树脂中的均匀分散。     

Silica-templated melamine-formaldehyde resin derived adsorbents for CO2 capture

Adsorption on porous solids is an emerging alternative for CO₂ capture that seeks to reduce the costs associated to the capture step. The enhancement of a specific adsorption capacity may be carried out by increasing the affinity of the adsorbent surface to CO₂. Nitrogen enrichment is reported to be effective in introducing basic functionalties that enhances the specific adsorbent-adsorbate interaction for CO₂. In this work a templating technique was used to produce highly porous nitrogen enriched carbons from melamine-formaldehyde resins. Nitrogen incorporated into the polymer matrix results in the greater stability of the adsorbents in terms of volatile and thermal loss of nitrogen. CO₂ capture performances were evaluated between 25 °C and 75 °C in a thermobalance. CO₂ adsorption capacities up to 2.25 mmol g⁻¹ of CO₂ at 25 °C were achieved. Both texture and surface chemistry influence the CO₂ capture performance of the adsorbents. The carbonisation temperature used during the synthesis step controls the nitrogen functional groups present, as determined by XPS, with the loss of triazine nitrogen with increasing carbonisation temperature proposed to account for the decreased CO₂ affinity.     

纳米二氧化钛对环氧树脂固化反应的影响

采用非等温DSC研究了纳米二氧化钛改性环氧树脂体系(EP)的固化动力学,采用Flynn-Wall-Ozawa和Vyazovkin非线性等转化率方法(NLV)法分析了固化活化能与转化率的关系,利用Kissinger和Crane方程研究了固化动力学参数,根据不同升温速率下DSC固化反应曲线确定了固化工艺参数。结果表明,纳米二氧化钛促进了环氧树脂的固化,降低了固化反应的活化能,但没有改变环氧树脂的固化机理。     

CO2 capture capacities of activated carbon fibre-phenolic resin composites

The potential of activated carbon fibre-phenolic resin composites for CO₂ capture has been evaluated in this work. A number of composites were fabricated using different types of carbon fibre under various conditions. The effect of a range of variables such as the type of carbon fibre, mass ratio of carbon fibre to phenolic resin, activation temperature and duration on the CO₂ adsorption capacity was investigated. Activated carbon derived from powdered phenolic resin demonstrates its capability to capture CO₂ and it plays a significant role in the low burn-off range. An apparent optimal degree of activation for CO₂ adsorption capacity was identified which was coincident with the maximum micropore volume measured by CO₂ physical adsorption. Micropore volume by CO₂ has been identified as a potential design parameter for the development of activated carbon fibre-phenolic resin composites for CO₂ capture. The existence of a cross-over regime is confirmed and lower burn-off samples are found to capture more CO₂ at ambient conditions. This is attributed to a narrow microporosity and a large contribution of micropore volume from smaller pores in the microporosity range of the composites. The optimal pore size for CO₂ capture becomes smaller when the relative pressure of CO₂ goes lower.