有机硅树脂部分

20051243 含活性硅嵌段聚合物的护发素，20051244 硅橡胶接枝共聚物的制备方法及基抗冲击热塑性组成物，20051245 聚合物混合相分离机制制备多子LPDMS膜，20051246 脱氢偶合催化剂存在下制备氨基官能的烷氧基聚硅氧烷的方法，……     

动态硫化热塑性弹性体的研究进展

简介了动态硫化热塑性弹性体的发展历史,并按橡胶及树脂组分的极性对动态硫化热塑性弹性体进行了分类(非极性橡胶与非极性树脂、极性橡胶与非极性树脂、非极性橡胶与极性树脂、极性橡胶与极性树脂).综述了最近几年国内外有关动态硫化热塑性弹性体在制备与性能(包括新品种、配合体系、改性及研究手段)、流变性能、微观形态、动态力学性能方面...     

AES公司SANTOPRENE热塑性弹性体

1　概述ＡＥＳ是一家专业生产销售ＥＰＤＭ +ＰＰ热塑性弹性体 (ＳＡＮＴＯＰＲＥＮＥ)的公司。该公司采用了先进的动态硫化工艺 ,即在橡胶与热塑料熔融共混过程中使橡胶硫化。这种共混物中橡胶颗粒的平均粒子大小为 1μｍ或更小 ,它们均匀分布在由热塑性材料构成的连续基中 ,并且完全交联 ,使该共混物的性能大大提高 ,例如 :永久变形性减小 ,耐疲劳性提高 ,高温使用性能改善 ,熔融强度增加 ,制出的完全硫化ＳＡＮＴＯＰＲＥＮＥ弹性体具有很好的物理性能。与热固性橡胶及一般弹性体相比较 ,ＳＡＮＴＯ ＰＲＥＮＥ弹性体提供了更大的设计自…     

动态硫化对TPU/EVM共混物加工流变行为的影响

采用过氧化二异丙苯(DCP)对热塑性聚氨酯弹性体(TPU)/乙烯-醋酸乙烯酯共聚物(EVM)共混物实施动态硫化后,TPU/EVM共混物的表观黏度增大,非牛顿性增强,挤出胀大比增大,挤出物表面粗糙。其中TPU/EVM=75/25时,黏度增加最大,并且随剪切速率的增加其非牛顿性由硫化前的减弱变为硫化后的增强。动态硫化后,纯TPU的表观黏度增大,说明过氧化物使其发生了一定程度的交联而又使其不失热塑性。     

线型聚硅氧烷改性聚醚型聚氨酯/环氧树脂互穿聚合物网络

以端羟基聚硅氧烷(PDMS)、4,4,-二苯甲烷二异氰酸酯(MDI)、聚醚多元醇为原料制得端异氰酸酯基(-NCO)聚氨酯预聚体,再与环氧树脂E-44反应制得一系列聚硅氧烷改性聚氨酯/环氧树脂互穿聚合物网络。通过红外光谱、接触角、拉伸试验、动态力学分析、扫描电子显微镜对聚合物体系的结构与性能进行了研究和表征。实验结果表明,聚硅氧烷的引入使得互穿聚合物网络的表面疏水性增强,表面自由能降低,拉伸强度下降但断裂伸长率升高。随着聚硅氧烷用量的增加,聚合物体系的玻璃化转变温度从-45℃提高到了-36℃。     

PVC／NBR共混型热塑性弹性体的形态结构

用扫描电子显微镜、动态力学谱仪和测定凝胶含量等方法,研究了动态硫化的聚氯乙烯/丁腈橡胶40(PVC/NBR-40)共混型热塑性弹性体的形态结构,并探讨了结构与性能的关系。结果表明:共混物的性能决定于动态共硫化时形成的凝胶含量和凝胶组成。为了达到良好的综合性能,凝胶含量应大于60％。PVC/NBR-40是单相的共混体系,动态共交联增加了PVC与NBR分子链之间的相互作用,并且使两种聚合物混合的均匀程度增加。本文提出了此材料的结构模型,指出动态硫化PVC/NBR-40共混型热塑性弹性体是一种新型的热塑性半互穿网络聚合物材料。     

硅系阻燃剂的研究进展

综述了硅系阻燃剂结构与性能及阻燃改性等方面的进展。线形聚硅氧烷和支链型聚硅氧烷等有机聚硅氧烷均可在不同程度上提高聚合物的阻燃性能。硅酸盐和无机纳米材料等无机硅系阻燃剂具有较好的阻燃效果。陶瓷前体聚合物和本质阻燃高聚物也是阻燃研究的重要方向之一。     

热塑性弹性体的研究进展

热塑性弹性体(TPE)兼具塑料和橡胶的特性,是近年来发展较快的一种新型高分子材料.文章介绍了苯乙烯类、聚氨酯类和聚烯烃类3类消耗量最大的热塑性弹性体,并对聚烯烃类热塑性弹性体中采用动态硫化技术制备的热塑性硫化橡胶的国内外研究进展进行了综述.     

动态硫化对共混物TPU/EVM动态力学性能的影响

橡胶加工分析仪RPA2000测试发现,动态硫化后共混物的储能模量G′升高,应变和温度依赖性减弱,Payne效应减弱,损耗因子tanδ降低,但频率依赖性与动态硫化前相似;RPA2000温度扫描中发现,在温度低于80℃时,动态硫化后G′反而降低,动态粘弹谱仪(DMA)测试也显示,动态硫化后共混物在高弹态时储能模量比硫化前低,原因可能是交联网络破坏了在高弹态时对模量贡献很大的热塑性聚氨酯(TPU)与白炭黑之间形成的键合橡胶。     

文摘

液体硅橡胶在过去十年已广泛应用于许多工业部门。各种应用要求改进原料和设备。在设备方面最新的改进方面有总混合体系、动态混合器、冷浇道管和挤出装置。在原料方面有硬度调节剂、活性聚合物颜料、新的催化剂体系、射频硫化和氟硅类特种产品等出现。     

热塑性弹性体材料的研究进展与市场前景

本文综述了热塑性弹性体 (TPE)材料的发展 ,共混型TPE的动态硫化技术及制备TPE的技术条件 ,评述并展望了其发展态势与方向     

Reinforcement of dynamically vulcanized EPDM/PP elastomers using organoclay fillers

Dynamically vulcanized EPDM/PP (ethylene-propylene-diene/polypropylene) elastomers reinforced with various amounts of organoclay were prepared using octylphenol-formaldehyde resin and stannous chloride dehydrate as vulcanizing agents. The effects of organoclay on vulcanization characteristics, rheological behavior, morphology, thermal stability and thermomechanical properties were studied. Experimental results showed that organoclay affected neither the vulcanization process nor the degree of vulcanization chemically. X-ray analysis revealed that these organoclay-filled thermoplastic vulcanizates (TPVs) were intercalated. With respect to the mechanical properties, organoclay increased both the strength and degree of elongation of TPVs. The morphological observation of fractured surfaces suggested that organoclay acted as a nucleating agent in TPVs, improving their mechanical properties. However, adding organoclay reduced the thermal stability of TPVs by decomposing the swelling agents in the organoclay.     

Reinforcement of dynamically vulcanized EPDM/PP elastomers using organoclay fillers

Abstract

Dynamically vulcanized EPDM/PP (ethylene-propylene-diene/polypropylene) elastomers reinforced with various amounts of organoclay were prepared using octylphenol-formaldehyde resin and stannous chloride dehydrate as vulcanizing agents. The effects of organoclay on vulcanization characteristics, rheological behavior, morphology, thermal stability and thermomechanical properties were studied. Experimental results showed that organoclay affected neither the vulcanization process nor the degree of vulcanization chemically. X-ray analysis revealed that these organoclay-filled thermoplastic vulcanizates (TPVs) were intercalated. With respect to the mechanical properties, organoclay increased both the strength and degree of elongation of TPVs. The morphological observation of fractured surfaces suggested that organoclay acted as a nucleating agent in TPVs, improving their mechanical properties. However, adding organoclay reduced the thermal stability of TPVs by decomposing the swelling agents in the organoclay.     

DCP用量对PP／EPDM共混物性能和形态的影响

用动态硫化法制备的PP／EPDM共混型热塑性弹性体的性能明显优于直接共混型PP／EPDM热塑性弹性体,这是由于模量低的EPDM柔性长链经化学交联后,强化对PP的增韧效果,而交联后又被扯断细化的EPDM的颗粒,改变了因EPDM相互缠结所导致的熔融粘度大,加工性能差的缺陷。制备PP／EPDM热塑性弹性体的关键是动态硫化,由于PP／EPDM共混物的动态硫化是一个融物理共混、化学引发交联和剪切细化分散为一体的复杂过程,材料的性能除决定于组成、组分性能和化学交联体系外,还强烈依赖于所采用的共混工艺方式及其条件。本章采用过氧化二异丙苯（DCP）作为硫化剂,研究了过氧化物用量对动态硫化PP（K8303）／EPDM共混物性能和形态的影响。     

静态硫化法制再生胶／聚乙烯热塑性弹性体的研究

本实验采用胎面再生胶与线型低密度聚乙烯(LLDPE)共混,通过静态硫化方法制取热塑性弹性体。文中讨论了静态硫化对共混体力学性能、粘弹性能和热塑性能等的影响,并用TEM表征了共混体的形态结构。     

Mapping of thermoplastic elastomeric nitrile rubber/poly(styrene-co-acrylonitrile) blends using tapping mode atomic force microscopy and transmission electron microscopy

Dynamically vulcanized thermoplastic elastomeric blends of nitrile rubber (NBR)/poly(styrene-co-acrylonitrile) (SAN) were mapped by tapping mode atomic force microscopy (TMAFM) and transmission electron microscopy (TEM). The morphology changes with the blend ratio and dynamic vulcanization. Roughness and surface analysis were used to study the effect of dynamic vulcanization and mixing sequence on the surface texture of the thermoplastic elastomeric blends. Surface geometry was quantified by power spectral density (PSD) and fractal analysis.     

促进剂对浅色硫化橡胶抗老化及耐黄变性能的影响

以红外光谱(FT-IR),扫描电镜(SEM),紫外线照射和热老化方法研究了促进剂对硫化胶的力学性能、抗紫外线、耐热老化以及耐黄变性能的影响,其结果表明,促进剂对浅色硫化胶的抗紫外线和耐热老化能力有决定性的功能作用,紫外线照射和受热使橡胶表面发生氧化而黄变和开裂,并使力学性能劣化。253.7 nm紫外线照射可作为快速测试、评判和预示白色或浅色硫化胶的抗紫外线、耐热老化以及耐黄变能力的方法。     

EPDM动态硫化增韧PP的性能和形态研究

采用羟甲基叔丁基酚醛树脂及２,５－二甲基－２,５－二叔丁基过氧基己烷／硫黄作交联剂,研究了三元乙丙橡胶动态硫化对增韧聚丙烯性能的影响。实验证实,随酚醛树脂用量增加共混物的抗冲韧性显著提高,但流动性明显下降。过氧化物既能有效硫化橡胶,又能使聚丙和解,从而得到高韧性和高流动性的共混物。扫描电镜分析表明,交联剂用量增加,共混物中橡胶相粒径显著减小,这归因于橡胶相的交联和在橡界面形成接枝或嵌段共聚物。     

SC–CO<Subscript>2</Subscript>-assisted rubber dispersion and dynamic vulcanization in blending of PP/EPDM thermoplastic olefin

Supercritical CO₂ (SC–CO₂), as a green medium, was induced in the traditional way of preparing polypropylene/ethylene–propylene–diene terpolymer (EPDM) thermoplastic olefin (TPO) by dynamic vulcanization using a twin-screw extruder. The morphology observation suggested that the SC–CO₂ not only promoted the rubber dispersion, but also facilitated the rubber dynamic vulcanization; therefore, the crosslinked EPDM particles were more densely distributed in the TPOs prepared with SC–CO₂, and existed as a stronger viscoelastic phase restricting the mobility of polymer chains, increasing the complex viscosity and storage modulus and promoting the mechanical properties.