聚丁二烯液体橡胶及其研究进展

概述了聚丁二烯液体橡胶的常见种类和特性,阐述了端羟基聚丁二烯液体橡胶、端羧基聚丁二烯液体橡胶和端羟羧基聚丁二烯液体橡胶的特性及应用,介绍了聚丁二烯液体橡胶的研究进展。     

液本橡胶的应用研究现状及开发前景

介绍了液体橡胶的种类及应用研究现状，指出了液体橡胶的开发前景及存在问题。     

液体橡胶

液体橡胶最早出现于1923年,由固体橡胶降解制得。直到1943年,才出现了合成液体聚硫橡胶、后来又相继出现了液体聚氨酯,液体硅橡胶,无官能团及遥爪二烯烃聚合物。 有关液体橡胶的综述已有报道。本文仅以国内开发研究的聚二烯烃液体橡胶作一简要综述,重点介绍遥爪聚合物。     

端官能团液体橡胶合成及应用研究进展

介绍了端官能团液体橡胶产品的开发现状，综述了国内外端官能团液体橡胶合成及应用研究的进展，指出液体胶应着力发展的方向。     

聚氨酯液体橡胶制备对环境影响及解决措施

分析了聚氨酯液体橡胶制备对环境产生的影响及对人身的伤害作用,针对液体橡胶的制备工艺,从原材料的选取及加入量确定、催化剂助剂的选择、加工及使用温度等多方面进行了研究,提出了解决液体橡胶制备对环境影响的措施,保护了环境,降低了对人身的伤害作用。     

液体橡胶及其硫化

本文介绍了液体橡胶的发展过程，主订品种及牌号、硫化机理以及不同品种液体橡胶的硫化剂品种选择。     

液体橡胶增韧改性环氧树脂的研究进展

文章对近年来液体橡胶增韧环氧树脂的研究进行了总结和评论,其中包括液体聚丙烯酸酯橡胶,液体聚丁二烯橡胶,液体丁腈橡胶等。     

一起液体橡胶试验装置爆炸事故分析

某研究院液体橡胶试验装置主要从事端羟基聚丁二烯液体橡胶（简称丁羟，HTPB）、端羧基聚丁二烯一丙烯腈液体橡胶（简称丁腈羧，CTBN）等多种液体橡胶系列产品的研究开发，产品主要用于航天航空和军工领域。2005年12月6日，液体橡胶试验装置进行丁腈羧试验时，聚合釜发生爆炸，一些管线及设备受到破坏，所幸人员只受轻伤。     

液体橡胶的研究进展Ⅱ.端基聚丁二烯液体橡胶的合成

概述了端基聚丁二烯液体橡胶的常见种类和特性,主要介绍了端羟基聚丁二烯液体橡胶、端羧基聚丁二烯液体橡胶和端羟羧基聚丁二烯液体橡胶的合成技术,包括自由基乳液聚合法、自由基溶液聚合法、负离子聚合法等.     

含硫代聚脲结构的聚硫密封胶的合成与性能

利用异佛尔酮二异氰酸酯扩链液体聚硫橡胶,合成了巯基封端的含硫代聚脲结构的液体聚硫橡胶,测定了其巯基含量、粘度及红外光谱的变化,并用该液体聚硫橡胶制备了密封胶。应力-应变、粘合强度测试及热重分析表明,随着硫代聚脲含量的增加,密封胶的抗张强度和粘合强度得到提高,而其热稳定性几乎未发生变化。     

Biosorption: critical review of scientific rationale,environmental importance and significance for pollution treatment

Biosorption may be simply defined as the removal of substances from solution by biological material. Such substances can be organic and inorganic, and in gaseous, soluble or insoluble forms. Biosorption is a physico‐chemical process and includes such mechanisms as absorption, adsorption, ion exchange, surface complexation and precipitation. Biosorption is a property of both living and dead organisms (and their components) and has been heralded as a promising biotechnology for pollutant removal from solution, and/or pollutant recovery, for a number of years, because of its efficiency, simplicity, analogous operation to conventional ion exchange technology, and availability of biomass. Most biosorption studies have carried out on microbial systems, chiefly bacteria, microalgae and fungi, and with toxic metals and radionuclides, including actinides like uranium and thorium. However, practically all biological material has an affinity for metal species and a considerable amount of other research exists with macroalgae (seaweeds) as well as plant and animal biomass, waste organic sludges, and many other wastes or derived bio‐products. While most biosorption research concerns metals and related substances, including radionuclides, the term is now applied to particulates and all manner of organic substances as well. However, despite continuing dramatic increases in published research on biosorption, there has been little or no exploitation in an industrial context. This article critically reviews aspects of biosorption research regarding the benefits, disadvantages, and future potential of biosorption as an industrial process, the rationale, scope and scientific value of biosorption research, and the significance of biosorption in other waste treatment processes and in the environment. Copyright © 2008 Society of Chemical Industry     

振动丝法测定常压和加压下液体的黏度和密度

介绍了自行研制的高温高压振动丝黏度密度仪的构造和测定原理，并以正戊烷作为实验流体对仪器的可靠性和准确性进行了测试.测定了环己烷在323.15～413.15 K温度范围内、正辛烷在313.15～393.15 K温度范围内、苯在303.15～445.15 K温度范围内压力分别为常压和6.10 MPa、正庚烷和异辛烷在298.15～403.15 K温度范围内压力分别为常压和5.10 MPa下的黏度与密度，并分别对不同压力下的黏度、密度数据进行了关联.     

木质素/热塑性塑料复合材料界面增容的研究进展

将木质素作为一种有机颗粒填料添加到热塑性塑料中,可解决造纸黑液资源化利用、石油原料日渐紧张以及环境污染加剧等严峻问题。而木质素与热塑性塑料之间相容性直接影响木质素在塑料工业中的应用与发展。首先简要概述了木质素结构与性质和木质素/热塑性塑料复合材料的性能分析,然后系统地阐述国内外研究木质素/热塑性塑料复合材料界面增容方法及其原理;增容方法按添加相容剂、改性木质素和改性塑料进行归类,并对3种增容方法进行比较分析;接着综述了木质素复合材料中增容方法的交叉复合使用;最后对未来木质素/热塑性塑料复合材料界面增容的研究方向以及思路进行了展望。     

Characterization of chlorophyll pigments present in canola seed,meal and oil

Chlorophyll pigments present in canola seed, meal and crude and degummed oils were analyzed by high-performance liquid chromatography (HPLC) with a fluorescence detector. Chlorophylls a and b, low levels of pheophytin a, and occasionally traces of pheophorbide and its methyl ester were present in canola seed. Meals and oils contained magnesium-deficient chlorophyll pigments such as pheophorbide a, methylpheophorbide a, pheophytins a and b, and pyropheophytins a and b but not chlorophyll a or b. The amounts of chlorophyll pigments were oil > seed >> meal. Both crude and degummed oils contained pheophytin a and pyropheophytin a as main components, but the ratio of pyropheophytin a to pheophytin a was markedly higher in degummed oils. No pheophorbides were detected in degummed oils. These results suggest that oil processing steps such as extraction and degumming affect the composition of chlorophyll pigments. Publication No. 678 Canadian Grain Commission.     

工业生产中物位测量的探讨与研究

在工业生产中常常会遇到常温,常压和一般介质的液位,料位和界面的测量,也会遇到高温,高压,易燃易爆,腐蚀性较强的液位,料位和界面的测量。在工业生产中物位测量有接触式和非接触式测量。但应根据生产工况及技术要求来合理选用。     

A Simulation Model for Heat Pump Dryer Plants for Fruits and Roots.

Dryer design requires food properties, drying rate and mass-heat transfer coefficients. These values change continuously during drying due to changes in food fractions, particularly the water fraction. The high energy demand and costs allied to inefficient devices, creates a great need for new processing equipment. Along these guide-lines, several heat pump drying research projects were established at the Norwegian University of Science and Technology. The heat pump dryer provides high quality final product as its drying conditions can be controlled. Its efficiency and non-polluting operation come from closed air-refrigerant circuits and from its ability to fully recover the latent heat of moist air as it exits the drying chamber. Most of the above features are quite the opposite of the conventional dryer characteristics. Several experiments were made on heat pump drying of fruits and roots at temperatures from -22.5 to 40°C to obtain data and correlations on thermophysical properties, specific enthalpy and rehydration. Also, tests were done on drying rate, moisture content, drying constant, effective mass diffusivity and heat and mass transfer equations. The next important phase is the development of a simulation model to predict the performance and characteristics of the heat pump dryer plant. The objectives of the present work are to develop and lo test a heat pump dryer simulation model. The simulation provides results on the characteristics of both plant and components which are integrated by heat and mass transfer equations. The program has menus with click-on icons, input and output pop-up dialogue boxes. The usual commands such as, file-open, file-save, edit-delete are available in this program simply called Hpdryer. The model contains moist air psychrometric. natural and conventional refrigerant property libraries. Ammonia is a time-tested, self-alarming and natural refrigerant. It has been used extensively in the past, and it has better thermodynamic and transport properties than halocarbons. Safety is easily attained by design and its restrictive standards have helped increase its use in several countries. There are 36 ammonia installations in Norway and in the United Kingdom, including a drying plant. Ammonia has zero Odp, zero Gwp and the recent R&D has led to viable small-sale heat pump plants. Ammonia and dichlarodifluoromethane refrigerants were used in the test cases simulated by Hpdryer madel.     

塑料挤出机螺杆,机筒耐磨损,耐腐蚀的强化与应用

对塑料挤出机,注塑机螺杆,机筒的磨损,腐蚀原因及提高螺杆,机筒耐磨损,耐腐蚀的方法、制造与应用作了较详尽的介绍。     

The Body’s Cellular and Molecular Response to Protein-Coated Medical Device Implants: A Review Focused on Fibronectin and BMP Proteins

Recent years have seen a marked rise in implantation into the body of a great variety of devices: hip, knee, and shoulder replacements, pacemakers, meshes, glucose sensors, and many others. Cochlear and retinal implants are being developed to restore hearing and sight. After surgery to implant a device, adjacent cells interact with the implant and release molecular signals that result in attraction, infiltration of the tissue, and attachment to the implant of various cell types including monocytes, macrophages, and platelets. These cells release additional signaling molecules (chemokines and cytokines) that recruit tissue repair cells to the device site. Some implants fail and require additional revision surgery that is traumatic for the patient and expensive for the payer. This review examines the literature for evidence to support the possibility that fibronectins and BMPs could be coated on the implants as part of the manufacturing process so that the proteins could be released into the tissue surrounding the implant and improve the rate of successful implantation.     

Intricate Connections between the Microbiota and Endometriosis

Imbalances in gut and reproductive tract microbiota composition, known as dysbiosis, disrupt normal immune function, leading to the elevation of proinflammatory cytokines, compromised immunosurveillance and altered immune cell profiles, all of which may contribute to the pathogenesis of endometriosis. Over time, this immune dysregulation can progress into a chronic state of inflammation, creating an environment conducive to increased adhesion and angiogenesis, which may drive the vicious cycle of endometriosis onset and progression. Recent studies have demonstrated both the ability of endometriosis to induce microbiota changes, and the ability of antibiotics to treat endometriosis. Endometriotic microbiotas have been consistently associated with diminished Lactobacillus dominance, as well as the elevated abundance of bacterial vaginosis-related bacteria and other opportunistic pathogens. Possible explanations for the implications of dysbiosis in endometriosis include the Bacterial Contamination Theory and immune activation, cytokine-impaired gut function, altered estrogen metabolism and signaling, and aberrant progenitor and stem-cell homeostasis. Although preliminary, antibiotic and probiotic treatments have demonstrated efficacy in treating endometriosis, and female reproductive tract (FRT) microbiota sampling has successfully predicted disease risk and stage. Future research should aim to characterize the “core” upper FRT microbiota and elucidate mechanisms behind the relationship between the microbiota and endometriosis.     

A Simulation Model for Heat Pump Dryer Plants for Fruits and Roots.

ABSTRACT

Dryer design requires food properties, drying rate and mass-heat transfer coefficients. These values change continuously during drying due to changes in food fractions, particularly the water fraction. The high energy demand and costs allied to inefficient devices, creates a great need for new processing equipment. Along these guide-lines, several heat pump drying research projects were established at the Norwegian University of Science and Technology. The heat pump dryer provides high quality final product as its drying conditions can be controlled. Its efficiency and non-polluting operation come from closed air-refrigerant circuits and from its ability to fully recover the latent heat of moist air as it exits the drying chamber. Most of the above features are quite the opposite of the conventional dryer characteristics. Several experiments were made on heat pump drying of fruits and roots at temperatures from -22.5 to 40°C to obtain data and correlations on thermophysical properties, specific enthalpy and rehydration. Also, tests were done on drying rate, moisture content, drying constant, effective mass diffusivity and heat and mass transfer equations. The next important phase is the development of a simulation model to predict the performance and characteristics of the heat pump dryer plant. The objectives of the present work are to develop and lo test a heat pump dryer simulation model. The simulation provides results on the characteristics of both plant and components which are integrated by heat and mass transfer equations. The program has menus with click-on icons, input and output pop-up dialogue boxes. The usual commands such as, file-open, file-save, edit-delete are available in this program simply called Hpdryer. The model contains moist air psychrometric. natural and conventional refrigerant property libraries. Ammonia is a time-tested, self-alarming and natural refrigerant. It has been used extensively in the past, and it has better thermodynamic and transport properties than halocarbons. Safety is easily attained by design and its restrictive standards have helped increase its use in several countries. There are 36 ammonia installations in Norway and in the United Kingdom, including a drying plant. Ammonia has zero Odp, zero Gwp and the recent R&D has led to viable small-sale heat pump plants. Ammonia and dichlarodifluoromethane refrigerants were used in the test cases simulated by Hpdryer madel.