改善EPDM耐热性和加工性能的研究

研究了EPDM与甲基乙烯基硅橡胶(MVQ)共混,探讨了不同共混比和不同种类的增塑剂及用量对共混胶硫化特性、力学性能和老化性能的影响。结果表明,随着MVQ用量的增加,EPDM/MVQ共混胶的力学性能降低,老化性能增加,当EPDM/MVQ共混比为70/30时,综合性能最佳;共混胶中加入增塑剂,门尼粘度和交联密度均有所降低,添加20份石蜡油2280时,共混胶综合性能最好。     

三种不同硫化助剂对MVQ/EPDM共混胶性能的影响

研究了3种硫化助剂对MVQ/EPDM共混胶硫化特性、力学性能、耐热老化性能、高温压缩永久变形性能及动态力学性能的影响。结果表明,添加硫化助剂HVA—2的共混胶焦烧时间和正硫化时间均明显缩短;添加硫化助剂丁羟胶和TAIC的共混胶焦烧时间和正硫化时间均变化不大;添加硫化助剂丁羟胶的共混胶具有最好力学性能、耐热老化性能和压缩永久变形性能,其玻璃化温度也比空白样的低近3℃。     

3种硫化助剂对MVQ／EPDM共混胶性能的影响

华南理工大学的张明霞等人发现,3种硫化助剂（端羟基液态聚丁二烯、Ⅳ一Ⅳ间苯撑双马来酰亚胺、三烯丙基异氰酸酯）均可不同程度地提高甲基乙烯基硅橡胶／三元乙丙橡胶（MVQ／EPDM）共混胶的最高转矩、定伸应力和撕裂强度,改善共混胶的高温压缩永久变形性能。其中添加端羟基液态聚丁二烯的MVQ／EPDM共混胶具有最好的综合力学性能,     

硅橡胶／丁腈橡胶（MVQ／NBR）共混改性研究

研究了硅橡胶（MVQ）与丁腈橡胶（NBR）的共混并用,讨论了相容剂、硫化剂及MVQ/NBR比对并用胶物理力学及耐热性能的影响,找出了并用胶的合理配方及工艺条件。结果表明MVQ/NBR并用产品的物理机械性能有所提高、耐热老化性能也有所改善,     

动态硫化POE/MVQ热塑性弹性体改性EPDM性能的研究

采用双螺杆挤出机制备了动态硫化POE/MVQ热塑性弹性体(简称PMTPV),并将其与EPDM进行共混。研究了不同共混比胶料的硫化特性、力学性能、电绝缘性能、耐热氧老化性能及耐油性能,通过扫描电镜观察了胶料断面形貌结构。结果表明,加入PMTPV可改善共混胶力学性能、电绝缘性能、耐热氧老化性及耐油性能。EPDM/PMTPV共混比为40/60时,其共混胶综合性能最佳。     

共混比对AEM/MVQ共混胶性能的影响

研究了共混比对乙烯丙烯酸酯橡胶/甲基乙烯基硅橡胶（AEM/MVQ）共混胶硫化特性、力学性能、耐热老化性能、耐油性能、压缩永久变形及动态力学性能的影响。结果表明,随着AEM用量的增加,共混胶正硫化时间延长,拉伸强度、拉断伸长率和撕裂强度均增加,耐油性能提高;随着MVQ用量的增加,共混胶耐热老化性能提高,压缩永久变形减小。DMA数据显示,AEM和MVQ具有良好的相容性,共混胶低温性能比纯AEM橡胶有所改善。     

硫黄硫化体系对IIR／EPDM共混胶耐势老化性能的影响

研究了IIR／EPDM共混体系中的并用比、硫黄硫化体系对共混胶耐热老化性能的影响。研究结果表明，IIR与EPDM的相容共混性较好，共混胶力学性能较好。用正常硫黄、低硫高促进剂和无硫硫化体系都能得到性能较好的共混胶，其中以有效硫化体系硫化胶的耐热老化性能最为突出。     

NR/EPDM 的共硫化

利用环氧化天然橡胶(ENR)与天然橡胶(NR)和三元乙丙橡胶(EPDM)均有很好相容性的特点，采用硫化促进剂预混工艺对NR／EPDM并用胶实施共硫化。考察了其对NR／EPDM并用胶的硫化特性、硫化胶的物理机械性能和耐热空气老化性能的影响。结果表明：本工艺确实能改善NR／EPDM的共硫化性能，所得硫化胶物理性能较好且操作简单。     

氯磺化聚乙烯对三元乙丙橡胶耐热老化性能的影响

研究氯磺化聚乙烯(CSM)和氯化聚乙烯(CM)对三元乙丙橡胶(EPDM)物理性能及耐热老化性能的影响。结果表明:CSM具有独特的氯磺酰基,添加CSM的EPDM胶料定伸应力与拉伸强度增大,耐热老化性能明显提高;添加CM的EPDM胶料耐热老化性能无明显改善;添加气固法CSM3570与溶剂法CSMTS530的EPDM胶料耐热老化性能相近;气固法CSM3570用量为5份时,EPDM胶料耐热老化性能较好,性价比较高。     

相容剂对LDPE/MVQ并用胶热老化性能的影响

以低密度聚乙烯（LDPE）、相容剂、甲基乙烯基硅橡胶（MVQ）混炼胶为主要原料,加入自由基捕捉剂和硫化剂过氧化二异丙苯（DCP）,在双辊上将各组分进行熔融共混,通过平板硫化机将共混物硫化,制备出了LDPE／MVQ并用胶。本文重点研究了相容剂对LDPE／MVQ并用胶的力学性能和热老化性能的影响。结果表明,适量相容剂可以改善并用胶中LDPE和MVQ的相容性,提高材料的力学性能,而过多相容剂会阻碍LDPE与MVO共硫化反应的进行,降低并用胶机械强度和热老化性能。随着相容剂用量的增加,并用胶的拉伸强度、断裂伸长率和撕裂强度及热老化系数先增大后减小,其用量为15hpr时并用胶的综合性能最好。     

DMC/MVQ绝缘复合材料的制备及性能表征

针对硅橡胶力学性能差的特点,本工作以硅橡胶（MVQ）为基相,以团状模塑料（DMC）为增强相,以丁苯橡胶（SBR）为相容剂来制备DMC/MVQ绝缘复合材料,研究了SBR的用量对MVQ性能的影响。结果表明：SBR和MVQ共混制得的并用胶性能要比纯MVQ的性能好,其最佳配比为DMC 60phr,SBR 25phr,MVQ 75phr;制备的复合材料体积电阻率都在4.9×1012Ω.m以上,复合材料的绝缘性能良好;通过扫描电镜分析（SEM）和动态热机械分析（DMA）,研究了复合材料的相容性,SBR的加入改善了DMC/MVQ绝缘复合材料的相容性,增加了界面相互作用,提高了DMC/MVQ绝缘复合材料的性能。     

Synthesis of silane‐grafted ethylene vinyl acetate copolymer and its application to compatibilize the blend of ethylene‐propylene‐diene copolymer and silicone rubber

Vinyltrimethoxysilane‐grafted ethylene vinyl acetate copolymer (EVA‐g‐VTMS) was synthesized and applied to compatibilize ethylene‐propylene‐diene copolymer (EPDM)/methyl vinyl silicone rubber (MVQ) blends. The silane‐grafting was successfully proved by differential scanning calorimetry, FTIR spectroscopy and XPS spectroscopy. The additive amount of the compatibilizer (EVA‐g‐VTMS) was optimized to be 10 phr (parts per hundred of rubber in weight) based on analysis of scanning electron microscopy, mechanical properties, aging properties, dynamic mechanical properties, rheological properties and thermal properties. Compared with the blend without EVA‐g‐VTMS, results show that the blend with 10 phr of EVA‐g‐VTMS exhibits the finest morphology. Tensile strength, elongation at break, modulus at 100% elongation, tear strength and TE index increase by 82.5%, 16.9%, 60.0%, 40.9%, and 41.9%, respectively. Dynamic mechanical analysis reveals storage modulus increase and glass transition temperatures of EPDM and MVQ move closer to each other. Rheological analysis shows a decrease in complex modulus and complex viscosity, and the processibility of the blend was improved. Furthermore, thermogravimetric analysis shows enhancement of thermal stability. POLYM. ENG. SCI., 2017. © 2017 Society of Plastics Engineers     

无卤阻燃EVM/EPDM并用胶的性能研究

试验研究乙烯-乙酸乙烯酯橡胶（EVM）/EPDM并用胶的性能。结果表明,随着EPDM用量的增大,EVM/EPDM并用胶的物理性能变化不大,热空气老化后并用胶的邵尔A型硬度和拉伸强度增大,拉断伸长率减小,耐低温性能提高；EVM或EVM/EPDM并用胶的阻燃性能明显优于EPDM；添加阻燃剂和增塑剂的EVM/EPDM并用胶的相容性较未添加阻燃剂和增塑剂的并用胶有所改善。     

团状模塑料/三元乙丙橡胶共混物的表征及其性能的影响因素

用团状模塑料(DMC)与三元乙丙橡胶(EPDM)共混,以EPDM为连续相、DMC为分散相,制备了DMC/EPDM共混物,并对其微观结构进行了表征,研究了DMC与EPDM的质量比、过氧化物硫化荆的种类和用量以及白炭黑的用量对共混物性能的影响.结果表明,DMC和EPDM的界面作用强,相容性好;过氧化苯甲酰(BPO)作硫化荆要好于用过氧化二异丙苯;当DMC与EPDM的质量比为90/100、BPO为5份、白炭黑为50份时,共混物的力学性能和耐热老化性较好.     

耐高温有机硅-乙丙橡胶并用胶的制备研究

本文通过借助偶联剂作为界面相容助剂,采用硅橡胶（MVQ）改性三元乙丙橡胶（EPDM）,获得了具有较高力学强度和良好耐高温老化性能的并用胶。通过硫化曲线、橡胶加工性能分析仪（RPA）和机械力学性能分析,评价了γ-甲基丙烯酰氧基丙基三甲氧基硅烷（KH570）和十二烷基三甲氧基硅烷（WD-10）两种常见偶联剂对改性并用胶的不同作用效果及机制：由于反应性双键的存在,KH570能同时增强填料间、填料-橡胶间的相互作用,但不利于填料的分散和橡胶生热的降低;WD-10不能明显增强填料-橡胶间的相互作用,但惰性长链烷基的存在可以使填料更为稳定的分散。老化前后的机械力学性能表明,两种偶联剂并用时,能获得综合力学性能和耐高温老化性能优异的MVQ改性EPDM耐高温复合材料。     

硅橡胶/顺丁橡胶/乙丙橡胶共混材料的研究

针对硅橡胶具有较高耐热性．但力学性能差；三元乙丙橡胶（EPDM）力学性能较好，但互粘性较差；顺丁橡胶（BR）弹性好．但加工性能堇的特点，提出了将硅橡胶、三元乙丙橡胶与顺丁橡胶共混的方法，制成共混材料；再通过测定样品的性能，确定共混的最佳配比。结果表明：BR与EPDM、硅橡胶相客性较好，可达到共硫化；硅橡胶／BR／EPDM质量比为20／30／50时，共混物的物理机械性能和老化性能较好；用过氧化二异丙苯（DCP）／硫磺作硫化剂要好于用硫磺、过氧化二苯甲酰（BPO）和硫磺／BPO硫化剂。试样的耐热老化性能、邵尔A型硬度和扯断伸长率较好，其中样品的综合性能具备了硅橡胶、顺丁橡胶和三元乙丙橡胶的优点。     

Properties and morphologies of elastomer blends modified with EPDM‐g‐poly[2‐dimethylamino ethylmethacrylate]

The graft copolymerization of 2‐dimethylamino ethylmethacrylate (DMAEMA) onto ethylene propylene diene mononer rubber (EPDM) was carried out in toluene via solution polymerization technique at 70°C, using dibenzoyl peroxide as initiator. The synthesized EPDM rubber grafted with poly[DMAEMA] (EPDM‐g‐PDMAEMA) was characterized with ¹H‐NMR spectroscopy, gel permeation chromatography (GPC), differential scanning calorimetry (DSC), and thermal gravimetric analysis (TGA). The EPDM‐g‐PDMAEMA was incorporated into EPDM/butadiene acrylonitrile rubber (EPDM/NBR) blend with different blend ratios, where the homogeneity of such blends was examined with scanning electron microscopy and DSC. The scanning electron micrographs illustrate improvement of the morphology of EPDM/NBR rubber blends as a result of incorporation of EPDM‐g‐PDMAEMA onto that blend. The DSC trace exhibits one glass transition temperature (T_g) for EPDM/NBR blend containing EPDM‐g‐PDMAEMA, indicating improvement of homogeneity. The physico‐mechanical properties after and before accelerated thermal aging of the homogeneous, and inhomogeneous EPDM/NBR vulcanizates with different blend ratios were investigated. The physico‐mechanical properties of all blend vulcanizates were improved after and before accelerated thermal aging, in presence of EPDM‐g‐PDMAEMA. Of all blend ratios under investigation EPDM/NBR (75/25) blend possesses the best physico‐mechanical properties together with the best (least) swelling (%) in brake fluid. Swelling behavior of the rubber blend vulcanizates in motor oil and toluene was also investigated. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2009     

Thermal and mechanical properties of dough modeling compound reinforced ethylene propylene diene monomer/silicon rubber composites

Ethylene propylene diene monomer (EPDM)/silicon rubber composite was prepared by adding dough‐modeling compound (DMC). EPDM/silicon rubber is the matrix of the composite, and DMC is a disperse phase (reinforced phase). The morphology of the composite was studied by scanning electron microscopy, and it was found that the compatibility of DMC/EPDM/silicon rubber composite was good. The influence of the DMC and peroxide curing agents on the mechanical and thermal properties were studied. The results showed that the mechanical and thermal properties of the composite were best, when DMC/EPDM/silicon rubber was 80/25/75. The thermal properties of the composite prepared with added equivalent dicumyl peroxide was better than those with added benzoperoxide, but Shore A hardness and elongation at break are unchangeable. The integral properties of DMC reinforced EPDM/silicon rubber composite was much better than three raw materials. POLYM. COMPOS. 27:621–626, 2006. © 2006 Society of Plastics Engineers     

Preparation and performances of ethylene–propylene–diene terpolymer/acrylic rubber reinforced with a dough‐modeling compound

A novel composite was prepared by the addition of a dough‐modeling compound (DMC) reinforcement and an ethylene–propylene–diene terpolymer (EPDM)/acrylic rubber (ACM) matrix. We studied the DMC/EPDM/ACM mass ratio and vulcanizing process by testing the tensile strength, Shore A hardness, elongation at break, and wear and thermal properties. The results show that the mechanical properties, thermal properties, and wear resistance of the composites were good when the DMC/EPDM/ACM mass ratio was 70/25/75 and the cure conditions were 180°C under 10 MPa for 25 min. The crosslinking structure of the composites was studied by IR, and this further proved the interaction between DMC, ACM, and EPDM. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci, 2008