含笼型倍半硅氧烷的无机/有机杂化物对环氧树脂的改性

将笼型八聚氨丙基倍半硅氧烷(NH2-POSS)与正丁基缩水甘油醚(XY501)进行反应,合成新型无机/有机纳米杂化物(DRT),用此杂化物对环氧树脂(E-51)进行增韧改性.对改性后环氧树脂的力学性能和热学性能进行了研究,发现所合成的杂化物对于环氧树脂的性能有较好的改善作用.     

POSS改性环氧树脂的耐热性研究进展

回顾并总结了近年来以笼型倍半硅氧烷(POSS)提高环氧树脂耐热性的研究成果。POSS具有独特的纳米尺寸效应,及其他纳米材料所没有的交联效应,因而能够有效地限制聚合物分子链的活动能力,提高聚合物的玻璃化转变温度和热残余量;此外,POSS的Si-O-Si内核不仅键能高,而且在受热氧作用后能够形成SiO2阻隔保护层,可进一步提高环氧树脂复合材料的耐热性。POSS是一种非常有前途的纳米杂化材料,在降低成本后将能够在环氧树脂耐热性提高方面发挥更大作用。     

环氧树脂/POSS杂化材料力学性能和耐热性研究

以自行合成的环氧基倍半硅氧烷（POSS）为改性剂,分别对环氧树脂139S/六氢苯酐和环氧树脂BE 188EL/六氢苯酐进行改性,制备环氧树脂/POSS杂化材料。力学性能分析结果表明,两种杂化材料的冲击强度和弯曲强度都有明显的提高,冲击强度分别提高了57.45 %和32.26 %,弯曲强度分别提高了9.23 %和5.07 %。热性能分析结果表明,两种杂化材料在高温时的热残留量都有所提高,分别提高了50.19 %和20.16 %。两种杂化材料的热膨胀系数也得到了降低,即热稳定性得到了提高。     

POSS改性聚合物复合材料力学性能研究进展

介绍了笼型倍半硅氧烷（POSS）的结构、分类以及POSS改性聚合物力学性能的特点和机理,综述了POSS改性聚合物（包括聚烯烃、环氧树脂、聚丙烯酸酯、聚氨酯等）复合材料力学性能的研究进展,并展望了POSS改性聚合物复合材料的发展前景。     

氨基POSS/环氧树脂有机无机杂化材料的动态力学性能

为了提高环氧树脂(EP)的综合性能,以含氨基官能团的笼型倍半硅氧烷(POSS)作为EP的改性剂,得到有机-无机POSS改性EP杂化树脂;然后以4,4′-二氨基二苯基砜(DDS)为固化剂对杂化树脂进行固化,得到有机-无机杂化材料。重点考察了POSS含量对杂化材料动态力学性能的影响。结果表明:不同杂化材料体系均呈单相结构,POSS在EP基体中分散较均匀,说明两者间相容性良好;随着POSS含量的不断增加,杂化材料体系的玻璃化转变温度(Tg)增大,与传统杂化材料不同的是损耗峰强度随POSS含量增加而降低,但损耗峰宽度几乎不变。     

笼型聚倍半硅氧烷(POSS)改性聚氨酯的研究进展

介绍了笼型聚倍半硅氧烷(POSS)的结构特征及性能特点,利用其与聚合物间良好的相容性,可以将带有一个或多个反应性基团的P OSS经物理混合或化学键合等方式,在聚氨酯体系内形成侧链型、线型和星型结构,从纳米尺寸上实现对材料的设计及改性,以改善聚氨酯材料本身在耐热性、耐水性和耐候性等方面的不足.最后对P OSS在聚氨酯材料...     

POSS改性PUR的研究进展

综述了近几年有关多面体低聚倍半硅氧烷（简称POSS）的结构及制备方法、POSS改性聚氨酯（PUR）的方法以及POSS改性PUR性能的研究进展。     

多面体低聚倍半硅氧烷在环氧树脂改性中的应用进展

综述了近几年多面体低聚倍半硅氧烷(POSS)在环氧树脂改性中的应用。POSS单独修饰环氧树脂,可提高其力学性能及热稳定性能;POSS协同9,10-二氢-9-氧杂-10-磷杂菲-10-氧化物等功能性分子一起修饰环氧树脂,可增强其阻燃性能;POSS与碳纳米管、石墨烯等纳米材料共同修饰环氧树脂,可提高纳米材料在环氧树脂中的分散性,改善纳米复合材料的导电能力和黏结强度等性能;POSS与纤维共同修饰环氧树脂,可有效增强纤维与环氧树脂间的界面性能。最后展望了POSS修饰改性环氧树脂的未来方向:开发更简易的引入方式,引入更多样的官能分子,协同多种纳米材料修饰环氧树脂。     

反应性笼形倍半硅氧烷（R-POSS）对纤维素纤维的改性

以γ-氨丙基三乙氧基硅烷为原料,通过酸化催化、水解、缩合可合成出结构规整合八氨基的笼形结构的聚γ-氨丙基倍半硅氧烷（POSS—NH2）,经甲醛化可制得反应性多-N甲氧基笼形倍半硅氧烷（POSS—N（CH2OH）2）。作为一种新型纳米交联增强荆,其具有高活性能力,与纤维素进行交联,能有效地改进纤维素纤维的弹性回复性能,其织物的经向和纬向折皱回复角均明现增加。     

笼形八乙烯基倍半硅氧烷改性氯化聚乙烯橡胶的性能研究

研究笼形八乙烯基倍半硅氧烷(OV-POSS)改性氯化聚乙烯橡胶(CM)的性能。结果表明:随着OV-POSS用量增大,CM胶料的硫化速度增大,硫化反应的表观活化能降低,OV-POSS改性CM胶料的硫化反应符合一级反应特征;CM胶料的拉伸强度逐步提高,拉断伸长率降低;CM胶料的储能模量、玻璃化温度和热稳定性提高。     

含环氧键的液晶高分子改性环氧树脂的研究

利用自制的含有环氧键的液晶高分子对环氧树脂/芳香胺固化体系进行改性,对改性样品进行了测试.对比改性前后环氧树脂性能,发现含环氧键的液晶高分子能显著提高环氧树脂的韧性,并对环氧树脂的耐热性也有较大程度的改善.采用SEM分析了改性环氧树脂体系的断面结构.     

环氧树脂和聚氨酯杂化物

将2种以上分子结构和性能各异的聚合物合成杂化物或改性物,是近年来聚合物技术的发展方向之一.简述了环氧树脂和聚氨酯杂化物的合成、改性原理及所得杂化物的主要应用领域.     

羧基液体丁腈橡胶增韧改性环氧树脂研究

用羧基液体丁腈橡胶（CTBN）对环氧树脂（EP）进行改性,合成CTBN/EP预聚物。通过研究不同配比CTBN/EP体系的性能,确定CTBN对EP的增韧效果。     

纳米蒙脱土插层聚合改性环氧树脂

以纳米蒙脱土为原料,采用插层聚合法制备了改性增韧环氧树脂.通过正交实验考查了混合时间、混合温度、蒙脱土类型、蒙脱土含量对改性环氧树脂断裂伸长率的影响.实验结果表明混合时间对改性环氧树脂的断裂伸长率影响最大,当混合时间为2h,混合温度为70℃,采用DK1类型的蒙脱土,添加量为2%时,制备的改性环氧树脂断裂伸长率为12.1...     

环氧树脂的改性研究进展

介绍了环氧树脂的特性和环氧树脂改性的主要趋势-提高环氧树脂的韧性,分别论述了橡胶类弹性体增韧环氧树脂、热塑性塑料增韧环氧树脂、热致液晶聚合物增韧环氧树脂、柔性链段固化剂增韧环氧树脂、无机纳米材料改性环氧树脂以及互穿网络(IPN)结构的环氧树脂体系等环氧树脂增韧改性的方法.同时,对聚氨酯的特性、用聚氨酯改性环氧树脂的六种方法以及互穿聚合物网络技术,进行了较为详细的介绍,并分析了改性环氧树脂目前存在的技术问题.     

有机硅改性环氧树脂的研究进展

综述了有机硅改性环氧树脂的主要方法及增韧机理,并展望了有机硅改性环氧树脂的发展趋势。     

液态丁腈橡胶增韧改性环氧树脂研究

用液态丁腈橡胶(LNBR)对环氧树脂(EP)进行增韧改性,制备出LNBR/EP复合材料。通过对不同含量LNBR的环氧树脂复合材料力学性能测试,结果表明:当LNBR含量为20 phr时,复合材料冲击强度、拉伸强度和断裂伸长率达到23.6 KJ/m2、60.2 MPa和26.32%;利用SEM对复合材料分析得到LNBR增韧使环氧树脂从脆性断裂变为韧性断裂;利用差示扫描量热法对复合材料的热性能分析得到:随着LNBR份数增多,体系Tg温度逐渐降低。     

Surface Modification of Epoxy Resin with Silicone-containing Block Copolymers

In order to improve oil and water repellency, silicone-containing block copolymers, composed of methylmethacrylate (MMA), glycidylmethacrylate (GMA), and polydimethylsiloxanemethacrylate (SMA), were blended in an epoxy resin. It was expected that the low surface energy dimethylsiloxane segments would adsorb and orient at the exterior of the resin to make a thin surface phase and the glycidyl groups would mesh with the epoxy resin by primary bonding. The techniques of X-ray photoelectron spectroscopy (ESCA), dynamic contact angle (DCA) and peel strength measurements of pressure sensitive adhesives were used to characterize the modified epoxy resin surface phases. The amount of Si_2p obtained via angular dependent ESCA investigation in the near surface region of the modified resin increased with decreasing sampling depth. With an increase in modifier content, both the amount of Si_2p and O_1s also increased. Both advancing and receding contact angles for an aluminum plate coated with modified resin, measured by dipping into and out of water, increased with the addition of these modifiers. The peel strength of a pressure sensitive adhesive tape affixed to the modified epoxy resin decreased dramatically with increasing modifier content. It was found that these copolymers were good surface modifiers to improve oil and water repellency and that they acted as release agents.     

Surface Modification of Epoxy Resin with Silicone-containing Block Copolymers

In order to improve oil and water repellency, silicone-containing block copolymers, composed of methylmethacrylate (MMA), glycidylmethacrylate (GMA), and polydimethylsiloxanemethacrylate (SMA), were blended in an epoxy resin. It was expected that the low surface energy dimethylsiloxane segments would adsorb and orient at the exterior of the resin to make a thin surface phase and the glycidyl groups would mesh with the epoxy resin by primary bonding. The techniques of X-ray photoelectron spectroscopy (ESCA), dynamic contact angle (DCA) and peel strength measurements of pressure sensitive adhesives were used to characterize the modified epoxy resin surface phases. The amount of Si_2p obtained via angular dependent ESCA investigation in the near surface region of the modified resin increased with decreasing sampling depth. With an increase in modifier content, both the amount of Si_2p and O_1s also increased. Both advancing and receding contact angles for an aluminum plate coated with modified resin, measured by dipping into and out of water, increased with the addition of these modifiers. The peel strength of a pressure sensitive adhesive tape affixed to the modified epoxy resin decreased dramatically with increasing modifier content. It was found that these copolymers were good surface modifiers to improve oil and water repellency and that they acted as release agents.     

含环氧基的聚合物对固体环氧树脂的增韧研究

通过溶液聚合制得了丙烯酸正丁酯(nBA)与甲基丙烯酸缩水甘油酯(GMA)的无规共聚物(PBG),并用其对粉末环氧树脂(EP)进行增韧改性。通过对改性后粉末环氧树脂的表征和力学性能测试,发现PBG对环氧树脂的诸多性能有良好的改善效果。