二甲胺聚醚改性有机硅表面活性剂的合成

以不饱和的聚醚和环氧氯丙烷为原料，合成出环氧不饱和聚醚；再与低含氢硅油进行硅氢加成反应，合成出环氧聚醚改性聚甲基硅氧烷；接着用二甲胺对环氧基开环，得到二甲胺聚醚改性有机硅表面活性剂。研究了硅氢加成反应条件对含氢硅油转化率的影响、用IR谱图表征了关键中间体及产物的结构、测定了产物的表面特性。硅氢加成反应的最佳工艺为：反应温度75℃、反应时间5h、聚醚中的C=C键与含氢硅油中的Si-H基的量之比为1．1：1．0；二甲胺聚醚改性有机硅表面活性荆的表面张力为21．4mN／m，在农纷螟施净水溶液中的临界胶束质量分数为3％，在临界胶束浓度下螟施净水溶液的表面张力值为24．8mN／m，能大幅降低农药的表面张力（降幅这24％）；从亲水亲油平衡（HLB）值看，二甲胺聚醚改性有机硅表面活性荆的亲油性稍强于亲水性，且HLB值在一定范围内随着pH值的降低而提高。     

磺基硅聚氧乙烯醚琥珀酸单酯二钠盐

南京工业大学的许澎等人以有机硅聚醚、马来酸酐、亚硫酸氢钠为原料,合成了磺基硅聚氧乙烯醚琥珀酸单酯二钠盐。产物具有较好的表面活性,临界表面张力为26.4 mN/m。     

有机硅改性聚酯的合成及其粉末涂料的性能

利用有机硅中间体合成了有机硅改性聚酯树脂。通过IR、GPC、SEM等分析了改性聚酯的结构与形态 ,用电子探针分析了改性聚酯的表面组成 ,考察了有机硅含量对改性树脂玻璃化温度、熔融黏度、对水的接触角及表面张力的影响。研究发现 ,改性聚酯中的含硅聚酯在表面富集 ,大大降低了聚酯树脂的表面张力 ,提高了其粉末涂料的涂膜耐候性。相对于纯聚酯树脂 ,有机硅质量分数为 1 %可使树脂的表面张力从 49.5降到 2 8.4mN/m ;经 2 1 6h中波紫外线照射后 ,涂膜的光泽保留率从 81 %上升到 91 .3 %。含有机硅质量分数超过 5 %后 ,涂膜的抗冲性能下降。     

氨基聚醚改性有机硅助剂的合成及性能

以1,1,3,3,5,5-六甲基三硅氧烷、烯丙基缩水甘油醚和聚氧乙烯烯丙醚为原料,合成出含环氧基的聚醚硅氧烷;然后用乙醇胺进行胺化,得到氨基聚醚改性有机硅助剂。这种氨基改性有机硅助剂具有较低的表面张力,较强的延展性,能够有效大幅度降低农药的表面张力,提高农药如草甘膦对杂草的控制效果。     

三硅氧烷和四硅氧烷乙氧基化物的合成和性能

以六甲基二硅氧烷和甲基二氯硅烷为原料，通过水解、平衡反应和分馏，得到了1，1，1，3，5，5，5-七甲基三硅氧烷和1，1，1，3，5．7，7，7-八甲基四硅氧烷；再与烯丙基聚氧乙烯醚进行硅氢加成反应，合成了三硅氧烷乙氧基化物和四硅氧烷乙氧基化物。用FT-IR对产品结构进行了表征，并测定了它们的表面张力。结果表明，三硅氧烷乙氧基化物和四硅氧烷乙氧基化物的表面张力分别为20．2mN／m和22．4mN／m。     

环氧基改性有机硅乳液聚合中乳化剂对聚合物乳液稳定性的影响

采用微乳液聚合法由D4开环聚合，含环氧基团的硅烷偶联剂共聚改性，合成了透明的环氧基改性有机硅微乳液。讨论了乳化剂对聚合反应速率、聚合物乳液粘度、乳胶粒径、聚合物乳液稳定性的影响。结果表明，采用阳／非离子型复合乳化剂10％(对乳液质量)有利于聚合反应进行，得到的环氧基改性有机硅乳液稳定。该环氧基改性有机硅乳液已经投产使用。     

聚醚改性三硅氧烷的合成工艺研究

以烯丙基聚醚与七甲基三硅氧烷为原料,通过硅氢加成反应合成出聚醚改性三硅氧烷。用IR对其结构进行表征,研究了催化剂用量、反应温度、反应时间、烯丙基聚醚与七甲基三硅氧烷的量之比[n(醚)/n(硅)]对七甲基三硅氧烷转化率的影响以及七甲基三硅氧烷转化率与产物表面张力的关系。结果表明,较佳反应条件是n(醚)/n(硅)为1.2、铂原子相对于七甲基三硅氧烷的质量分数为0.00075%、反应时间1 h、反应温度100～110℃。在此条件下合成出的聚醚改性三硅氧烷的0.1%的水溶液的表面张力为20.3 mN/m,七甲基三硅氧烷的转化率为98.1%。     

双酯基季铵盐表面活性剂的合成及性能研究

以尼龙酸、环氧氯丙烷为原料合成二元酸酯中间体,再与十二烷基二甲基胺进一步反应合成双酯基阳离子表面活性剂。研究了反应时间、温度及催化剂用量对产物收率的影响,得到了最佳反应条件。终产物结构通过红外光谱分析得到证实,并对其表面性能进行了测试,临界胶束浓度0．34mmol／L,表面张力29．9mN／m。     

氨基有机硅表面活性剂的合成及性能研究

采用八甲基环四硅氧烷与四甲基二氢基二硅氧烷在浓硫酸作用下合成含氢硅油,然后以氯铂酸为催化剂,烯丙基缩水甘油醚与含氢硅油发生硅氢加成合成环氧改性有机硅,最后通过二乙醇胺对环氧改性有机硅进行开环反应得到氨基有机硅。采用FTIR和1HNMR对产物结构进行表征,研究氨基有机硅的润湿性能,测定得到其临界胶束浓度为0.102 g·L-1,并与嵌段硅油9906和共聚改性嵌段硅油进行比较研究。结果表明,润湿力随氨基有机硅含量的增加而增强,相同含量下,氨基有机硅的氨值越大,其对帆布的润湿力越强,所合成氨基有机硅微乳液的稳定性、整理后织物的亲水性和柔软手感均比嵌段硅油9906和共聚改性嵌段硅油好。     

氨基聚醚改性有机硅助剂的合成及性能

以1，1，3，3，5，5一六甲基三硅氧烷、烯丙基缩水甘油醚和聚氧乙烯烯丙醚为原料，合成出含环氧基的聚醚硅氧烷；然后用乙醇胺进行胺化，得到氨基聚醚改性有机硅助剂。这种氨基改性有机硅助剂具有较低的表面张力，较强的延展性，能够有效大幅度降低农药的表面张力，提高农药如草甘膦对杂草的控制效果。     

环氧改性有机硅树脂的应用研究

以不同环氧改性有机硅树脂作为基料树脂,研究了不同树脂对漆膜性能的影响;通过选用不同固化体系对漆膜机械性能和耐热性做了比较;同时研究了环氧改性有机硅树脂与有机硅树脂的混溶性及影响;分别研究了该树脂配制的底、中、面涂层的常规性能及复合涂层的机械性能。同时对不同固化剂的影响和不同树脂的影响做了TG和DSC分析,结果表明,环氧改性有机硅树脂耐温性能较环氧树脂有较明显的提高,基本可用于高温涂料;环氧改性有机硅树脂可与纯有机硅树脂复配,有望形成具有更高耐温性能的涂膜。并且可通过复合固化剂的选用达到更佳的耐温性能和较好的物理机械性能。     

硅烷偶联剂及其水解物对环氧树脂拉伸剪切强度的影响

以双酚A和环氧氯丙烷为原料,通过缩聚反应制得环氧树脂;将硅烷偶联剂γ-甲基丙烯酰氧基丙基三甲氧基硅烷(KH-570)在酸催化下水解,得到水解物。探讨了KH-570及其水解物用量对环氧树脂胶黏剂拉伸剪切强度的影响。结果表明,不加KH-570及其水解物时,环氧树脂胶黏剂的拉伸剪切强度最大为2.47 MPa;只加KH-570水解物时,环氧树脂胶黏剂的拉伸剪切强度最大为3.28 MPa;只加入KH-570时,环氧树脂胶黏剂的拉伸剪切强度最大为5.23 MPa。在KH-570水解物与环氧树脂的质量比相同条件下,随着KH-570用量的增大,环氧树脂胶黏剂的剪切强度先增后减,在KH-570的用量为环氧树脂质量的15%时达到最大;相同KH-570用量下,随着KH-570水解物用量的增大,环氧树脂胶黏剂的剪切强度先增后减,在KH-570水解物和环氧树脂的质量比为5∶5时达到最大。当KH-570的用量为环氧树脂质量的15%、KH-570水解物与环氧树脂的质量比为5∶5时,环氧树脂胶黏剂的拉伸剪切强度达到9.36 MPa。     

Synthesis and modification of trifunctional epoxy resin with amine terminated polydimethyl siloxanes for semiconductor encapsulation application

Epoxy resins based on the triglycidyl ether of tris(hydroxyphenyl)methane (TETM) possess a very high heat distortion temperature and superior thermal oxidative stability over other types of epoxy resins. The high performance trifunctional epoxy resin (TETM) was synthesized by the condensation of a hydroxybenzaldehyde with phenol followed by epoxidation with a halohydrin. The structure of the synthesized TETM was confirmed by infrared (IR), mass spectra (MS), and nuclear magnetic resonance (NMR) spectroscopy. Amine terminated polydimethylsiloxanes (ATPDMS) were used to reduce the stress of trifunctional epoxy resin cured with phenolic novolac resin for electronic encapsulation applications. The dispersed silicone rubbers effectively reduce the stress of cured epoxy resins by reducing the coefficient of thermal expansion (CTE) and flexural modulus, while the glass transition temperature (T_g) is depressed by only a small amount.     

Preparation and characterization of thermally stable epoxy-titanate coatings

Epoxy-polyamide coatings are used to protect metallic substrates in corrosive atmosphere. Thermal stability of the coating can be improved by the addition of inorganic cross-linking agent. Epoxy resin is incorporated with small percentage of silicone resin and cured with two types of hardeners such as polyamide and butyl titanate. The physical properties, heat resistance properties and electrochemical impedance behaviour of these coatings on steel in 0.5 M NaCl solution have been studied. The result implies that the heat resistant character of the titanate-cured coating is increased from 260 to 370 °C. The impedance study has shown that the coating resistance exerted by both the systems is in the range of 10⁵ Ω cm² after 6 days of immersion in 0.5 M NaCl. FTIR and Raman spectroscopy analysis confirm the presence of titanate linkage in the cured polymer coating. Thermal stability data indicate that the epoxy silicone resin cured with titanate hardener possesses higher thermal stability than that cured by polyamide hardener.     

Impact of water absorption on the creep performance of epoxy/microcrystalline cellulose composites

Recently, considerable effort has been made to study cellulose/epoxy composites. However, there is a gap when it comes to understanding the post-conditioning anomalous effect of moisture uptake on their mechanical and dynamic-mechanical properties, and on their creep behavior. In this work, up to 10.0 wt% microcrystalline cellulose (MCC) was incorporated into epoxy resin by simple mixing and sonication. Epoxy/MCC composites were fabricated by casting in rubber silicone molds, and rectangular and dog-bone test specimens were produced. The moisture uptake, dynamic mechanical, chemical, tensile, and creep behavior were evaluated. The incorporation of MCC increased the water diffusion coefficient. The changes in storage modulus and glass transition temperature, combined with Fourier-transform infrared spectroscopy analysis, evidenced that water sorption in epoxies causes both plasticization and additional resin crosslinking, although the latter is prevented by the addition of MCC. The creep strain of the composites increased by 60% after conditioning, indicating that plasticization induced by water sorption plays an important role in the long-term properties of the composites.     

纳米SiO_2对聚丙烯/环氧树脂共混物性能的影响

采用熔融共混法制备了聚丙烯(PP)/环氧树脂(EP)共混物,研究了纳米SiO2对共混物性能的影响。结果表明:与纯PP相比,PP/EP共混物的冲击强度、断裂伸长率及黏度降低,弯曲模量增大;在PP/EP共混物中加入纳米SiO2后,共混物弯曲模量和冲击强度明显提高;将硅烷偶联剂KH550改性的纳米SiO2(SiO2-KH550)添加到共混物中,在EP为17%、SiO2-KH550为7%时,共混物的弯曲模量比纯PP提高了64%;EP降低了PP的结晶温度。     

环氧胶粘剂的韧性与增韧机理

本文通过测定三种典型环氧结构胶粘剂：环氧-聚矾，环氧-丁腈40环氧-CTBN的动态力学性能，剥离强度和断裂韧性，观察其断面的电镜照片，分析了三者不同的韧性特点和增韧机理。并发现了PSF改性胶固化后奇特的两相结构。     

UHMWPE／Epoxy冻胶体系的流变行为研究

研究了环氧树脂(Epoxy)加入后对超高分子质量聚乙烯(UHMWPE)稳态表观粘度、粘流活化能以及复数模量和粘度的影响。结果表明,环氧树脂添加量低于1ω,UHMWPE／Epoxy冻胶体系的表观粘度和粘流活化能都低于空白 UHMWPE冻胶体系;当环氧树脂添加量增加至3 ω以后,冻胶体系的表观粘度和粘流活化能均比空白UHMWPE冻胶体系高。     

环氧官能化ABS增韧PBT及其共混物

合成了甲基丙烯酸环氧丙酯(GMA)接枝的丙烯腈-丁二烯-苯乙烯(ABS-g-GMA)核壳粒子增韧聚对苯二甲酸丁二醇酯(PBT),加入环氧树脂(Epoxy)为扩链剂进一步提高共混物的性能。红外光谱(FTIR)结果表明:GMA成功接枝到ABS粒子上;研究发现不同GMA含量的ABS-g-GMA粒子在PBT及PBT/Epoxy共混物中均匀分散;ABS-g-GMA对PBT增韧效果较好,Epoxy进一步提高了PBT/ABS-g-GMA共混物的冲击韧性及拉伸强度;ABS-g-GMA增韧PBT的机理是橡胶粒子的空洞化和PBT基体的剪切屈服。     

Mechanical Properties of Carbon Epoxy Prepreg Insert Phenolic Resin Injection Moldings

This study focuses on the insert-injection molding process. The thermoset composite inserts in this study were carbon fiber/epoxy(CF/Epoxy) prepreg sheets. The injected molded part was glass fiber contained phenolic resin(GF/PF). The CF/Epoxy was placed in the mold cavity prior to injecting GF/PF onto the inserted injection molded CF/Epoxy specimens. The role of adhesion between the inserted part and injected resin on the mechanical properties was evaluated by 3 point bending and impact tests. In addition, the effect of prepreg orientation on the mechanical properties of the prepreg inserted-injection molding system was investigated. It was found that the prepreg with unidirectional orientation significantly improved flexural and impact strength of the inserted injection molding composites, providing better support and resistance to bending and impact loading. The main failure modes of the specimens were structural and adhesive failure.