辛基酚发展概况及应用前景

本文介绍了辛基酚的发展概况、制备、应用与销售方向。重点介绍了树脂法的合成路线。     

N-苯基马来酰亚胺改性MCS接枝共聚物的合成与热性能研究

用N-苯基马来酰亚胺（N-PMI）作耐热改性剂，通过悬浮聚合法合成了接枝型MCS树脂，并对其热性能进行了研究。结果表明，N-PMI成功接枝在基体树脂上，接枝改性后的MCS树脂的热性能得到了明显的改善，玻璃化温度和热分解温度明显提高。     

响应面法优化荷叶生物碱盐提取工艺及其纯化

在单因素实验的基础上,通过响应面法分析和优化提取条件,考察超声酸提法中酸的种类、酸的质量分数、超声时间、液固比〔液体体积(m L)与固体质量(g)的比值〕、超声功率和温度对荷叶碱提取效果的影响以及D101型大孔树脂对提取物的纯化效果。得到的荷叶生物碱盐的最佳提取工艺条件为:加热温度60℃、超声功率500 W、盐酸质量分数0.3%、超声时间41 min、液固比27,在该工艺条件下荷叶碱的得率为(4.12±0.05)mg/g。以体积分数为70%的乙醇作为洗脱液,纯化后的生物碱盐经分光光度法测得纯度为40.81%。     

用于树脂压铸（RTM）的树脂基体研究

文中介绍了ＲＴＭ用树脂体系的研究概况，结果表明树脂体系具有低的粘度，较长的贮存期和良好的反应性能，固化树脂和复合材料的力学性能及耐热性能优良，它能满足ＲＴＭ对基体的要求。     

碳纤维／热固性塑料拉挤成型工艺探讨

本文主要讨论碳纤维／热固性塑料拉挤成工艺的材料选择及主要工艺参数的控制。     

复合材料制备用模具材料

以液态4，4′-二氨基二苯基甲烷四缩水甘油胺为基体树脂、四溴双酚A为增粘剂、1-氰乙基-2-甲基咪唑为固化剂，采用预浸法制成了复合材料。复合材料在中温(93℃)初固化后有足够的强度，在卸模后的高温(150℃x1h 180℃x2h)后固化过程中、在无支撑自由状态下能够保持自身尺寸的稳定性，可用作双马来酰亚胺基ACM的模具材料。     

有机硅树脂与溴系阻燃剂协同阻燃ABS的研究

研究了有机硅树脂SFR100对四溴双酚A双(2，3-二溴丙基)醚(TBAB)阻燃ABS的阻燃性能、冲击强度及电性能的影响。结果表明，SFR100与TBAB对ABS有协同阻燃作用，可有效提高阻燃ABS的阻燃性能和冲击强度，并使其电性能得到一定的改善。在TBAB用量为14％(质量分数，下同)的阻燃ABS中，SFR100的适宜用量为4％，此时氧指数和冲击强度分别从29．2％和11．2kJ／m^2提高到31．8％和15．1kJ／m^2，且电气强度提高，介电常数和介电损耗因数下降。TGA分析表明，SFR100提高了ABS的热分解温度。通过SEM发现，SFR100主要以微小的液滴形式均匀分散在ABS基体中。     

种子聚合法合成MBS树脂的研究

采用种子聚合工艺合成了PVC用透明型高抗冲改性剂MBS树脂，对树脂制备过程中的影响因素进行了研究。并对相同牌号的MBS树脂的综合性能进行了对比评价。研究表明；该法从根本上改善了聚合体系稳定性，合成的MBS树脂在抗冲击性，透明性及黄色指数方面达到了较好的平衡，并使得提高固含量和胶单比成为可能，有利于某些特定后处理工艺的实施。     

A study of the mechanical properties of short natural-fiber reinforced composites

The degree of fiber–matrix adhesion and its effect on the mechanical reinforcement of short henequen fibers and a polyethylene matrix was studied. The surface treatments were: an alkali treatment, a silane coupling agent and the pre-impregnation process of the HDPE/xylene solution. The presence of Si–O–cellulose and Si–O–Si bonds on the lignocellulosic surface confirmed that the silane coupling agent was efficiently held on the fibres surface through both condensation with cellulose hydroxyl groups and self-condensation between silanol groups.

The fiber–matrix interface shear strength (IFSS) was used as an indicator of the fiber–matrix adhesion improvement, and also to determine a suitable value of fiber length in order to process the composite with relative ease. It was noticed that the IFSS observed for the different fiber surface treatments increased and such interface strength almost doubled only by changing the mechanical interaction and the chemical interactions between fiber and matrix.

HDPE-henequen fiber composite materials were prepared with a 20% v/v fiber content and the tensile, flexural and shear properties were studied. The comparison of tensile properties of the composites showed that the silane treatment and the matrix-resin pre-impregnation process of the fiber produced a significant increase in tensile strength, while the tensile modulus remained relatively unaffected. The increase in tensile strength was only possible when the henequen fibers were treated first with an alkaline solution. It was also shown that the silane treatment produced a significant increase in flexural strength while the flexural modulus also remained relatively unaffected. The shear properties of the composites also increased significantly, but, only when the henequen fibers were treated with the silane coupling agent. Scanning electron microscopy (SEM) studies of the composites failure surfaces also indicated that there is an improved adhesion between fiber and matrix. Examination of the failure surfaces also indicated differences in the interfacial failure mode. With increasing fiber–matrix adhesion the failure mode changed from interfacial failure and considerable fiber pull-out from the matrix for the untreated fiber to matrix yielding and fiber and matrix tearing for the alkaline, matrix-resin pre-impregnation and silane treated fibers.     

Determining the 3D permeability of fibrous media using the Newton method

This work explores the reliability and sensitivity of using the Newton method to determine the elements of a fiber mat's permeability tensor. The goal of this work is to determine the extent to which experimental errors affect the numerical results and to provide general guidelines on which types of fiber materials are appropriate for this method. The sensitivity analysis reveals that employing the Newton method is a rather robust approach, applicable to a wide range of materials. The sensitivity analysis also reveals robustness with regard to experimental error as well.