多功能助交联剂CA94-50在三元乙丙橡胶中的应用

研究多功能助交联剂CA94-50在三元乙丙橡胶(EPDM)中的应用。结果表明,相较于添加助交联剂TAIC-70,SR350和Ricon 153D的胶料,添加多功能助交联剂CA94-50的EPDM胶料的焦烧时间较长,硫化速度和交联程度提高,硫化胶的硬度、100%定伸应力、拉伸强度和拉断伸长率较高,与金属的粘合强度较大,热氧老化后性能变化不大。     

高性能丁腈橡胶/聚氯乙烯汽车油管胶料的研制

采用过氧化二异丙苯(DCP)作主交联剂、三烯丙基异氰脲酸酯(TAIC)作助交联剂硫化丁腈橡胶/聚氯乙烯(NBR/PVC)共混胶以制备汽车油管胶料,研究了TAIC用量对胶料的硫化特性、压缩永久变形、力学性能、耐溶剂性能、耐热老化性能以及耐臭氧老化性能的影响。结果表明,随着TAIC用量的增加,共混胶料的正硫化时间逐渐缩短,硫化速率逐渐加快,交联效率提高,最大转矩增加;同时共混胶的硬度和拉伸强度逐渐增大,扯断伸长率减小,其压缩永久变形、耐溶剂、耐热老化以及耐臭氧老化性能则呈现不同的变化。当DCP用量为3.5份、TAIC用量为3份时,NBR/PVC共混硫化胶的综合性能最好。     

助交联剂对三元乙丙橡胶过氧化物硫化的影响

分别采用三烯丙基异氰脲酸酯(TAIC)、三羟甲基丙烷三甲基丙烯酸酯(TMPTMA)以及高乙烯基聚丁二烯(HVPBd)作为过氧化物硫化三元乙丙橡胶(EPDM)的助交联剂,研究其对EPDM胶料硫化特性及硫化胶力学性能的影响。结果表明,3种助交联剂的添加能明显促进硫化程度,硫化胶的硬度和定伸应力均明显提高,添加TAIC的EPDM混炼胶硫化程度最高,但添加TMPTMA使胶料的焦烧安全性变差,而添加HVPBd的EPDM胶料降解程度最低。通过一级动力学模型及自催化反应模型研究EPDM硫化动力学行为时发现,助交联剂类型影响胶料的硫化反应速率,其中TMPTMA能明显促进硫化反应速率,TAIC次之,而HVPBd几乎没有影响,但硫化反应表观活化能由于助交联剂的添加均出现降低,其中添加TAIC胶料的表观活化能最低。     

助交联剂对过氧化物硫化EPDM/白炭黑胶料力学性能的影响

分别采用三官能团丙烯酸酯、三羟甲基丙烷三甲基丙烯酸酯、N,N'-间苯基双马来酰亚胺、三烯丙基异氰尿酸酯作为过氧化物硫化EPDM的助交联剂,研究了助交联剂的品种和用量对EPDM/白炭黑胶料的硫化特性、力学性能、压缩永久变形性能和动态力学性能的影响.结果表明,添加助交联剂的胶料比空白试样的硫化最大转矩、定伸应力和硬度均有明...     

噻二唑硫化体系对氯化聚乙烯橡胶性能的影响

研究噻二唑硫化体系(硫化剂PT75/促进剂903体系)对氯化聚乙烯橡胶(CM)性能的影响。结果表明:与过氧化物硫化体系(过氧化物BIPB/助交联剂TAIC体系)胶料相比,噻二唑硫化体系胶料的拉伸性能和抗撕裂性能大大改善,耐热老化性能相当,耐油性能较好;硫化剂PT75和促进剂903用量比为2/2时,胶料的压缩永久变形较小,拉伸性能和抗撕裂性能较好,耐热老化性能优异。     

氢化丁腈橡胶过氧化物硫化体系的研究

研究硫化剂DCP和助交联剂TAC用量对氢化丁腈橡胶（HNBR）胶料性能的影响。结果表明：当助交联剂TAC用量为3份时,随着硫化剂DCP用量的增大,HNBR胶料的焦烧时间和正硫化时间缩短,硫化胶的物理性能提高,压缩永久变形明显减小,耐热氧老化性能有所改善;当硫化剂DCP用量为4份时,随着助交联剂TAC用量的增大,HNBR胶料的门尼粘度降低,硫化胶的定伸应力增大,压缩永久变形减小,耐热氧老化性能变化不大;硫化剂DCP和助交联剂TAC用量对HNBR硫化胶浸油后的物理性能有一定影响,但对体积膨胀率影响不大。     

助交联剂在氢化丁腈橡胶中的应用研究

研究添加不同用量助交联剂齐聚酯和三甲基丙烯酸三羟甲基丙烷酯(TMPTMA)的氢化丁腈橡胶(HNBR)的硫化特性和物理性能,并对比了两种助交联剂对HNBR的硫化特性、物理性能、老化性能、高温拉伸性能、耐磨性能和加工性能的影响。结果表明:随着齐聚酯或TMPTMA用量的增大,HNBR胶料的转矩增大,硫化时间缩短;拉伸强度基本不变,硬度、100%定伸应力和撕裂强度逐渐提高,拉断伸长率和回弹值减小。与添加齐聚酯的胶料相比,添加TMPTMA的胶料转矩较大,硫化时间较短;对比添加齐聚酯和TMPTMA的胶料,物理性能、老化性能、高温拉伸性能和耐磨性能都非常接近,即二者的作用原理相似。添加TMPTMA的胶料储能模量较小,损耗因子较大。     

助交联剂对硫化剂BIBP硫化氯化聚乙烯电缆护套性能的影响

研究助交联剂TAIC和HVA-2对硫化剂BIBP硫化氯化聚乙烯(CPE)电缆护套性能的影响。结果表明:加入助交联剂的CPE胶料t10和t90缩短,硫化胶的表观交联密度和剪切储能模量增大;与助交联剂TAIC相比,助交联剂HVA-2会降低胶料的焦烧安全性,提高硫化胶的物理性能和耐热老化性能;采用硫化剂BIBP和助交联剂HVA-2硫化的CPE电缆护套性能达到国家标准要求。     

助交联剂对过氧化物硫化氯磺化聚乙烯 胶管胶料性能的影响

研究助交联剂HVA-2用量对过氧化物硫化氯磺化聚乙烯胶管胶料性能的影响。结果表明:随着助交联剂HVA-2用量增大,混炼胶的F_(max)增大,t_(10)变化不大,t_(90)缩短,交联密度增大;硫化胶的硬度和拉伸强度增大,拉断伸长率减小,压缩永久变形减小;老化后,硫化胶的硬度和拉伸强度增大,拉断伸长率减小,且变化幅度随着HVA-2用量增大而减小;油浸泡后,硫化胶的体积减小,且体积变化率随着助交联剂HVA-2用量增大而减小;当助交联剂HVA-2用量为2份时,硫化胶的综合性能较好。     

助交联剂对CM胶料性能的影响

试验研究在过氧化物硫化体系中助交联剂TAIC，PDM和TCY对氯化聚乙烯橡胶（CM）胶料性能的影响，并与噻二唑硫化体系胶料进行对比。结果表明，过氧化物硫化体系中TAIC胶料的正硫化时间最短，交联程度最大，硫化反应表观活化能最小，高温耐油性能最优PDM硫化胶的综合物理性能和耐热老化性能较好，但耐热老化性能不如噻二唑硫化体系硫化胶，其常温耐油性能最优。     

交联助剂对过氧化物硫化天然胶乳性能的影响

选用不同的过氧化物硫化体系制得硫化天然胶,在此基础上探讨了不同种类及用量的交联助剂和热处理温度对硫化效果的影响.结果表明:选用BPO过氧化物硫化天然胶时,添加3份DVB交联助剂的硫化天然胶,基本达到了硫黄硫化的基本力学性能;选用过氧化二叔丁基-硫酸亚铁络合物的氧化还原体系,添加3份的SJ-1交联助剂,在80℃以上时,可使硫化天然胶性能进一步提高,拉伸强度相比BPO过氧化物硫化的天然胶增加了近一倍.平衡溶胀试验的结果表明,氧化还原体系制得的硫化胶有最小的平衡溶胀增量和最大的凝胶含量.     

Mechanical,vulcametric, and thermal properties of the different 5‐ethylidene 2‐norbornene content of ethylene‐propylene‐diene‐monomer vulcanized with different types and compositions of peroxides

Ethylene‐propylene‐diene‐monomer (EPDM) rubber is an important commercial polymer. The vulcanization process significantly changes its thermal, mechanical, and vulcametric properties. This study was carried out to find optimum formulation of EPDM composite for a better application in automotive industry. Sixteen EPDM polymer samples having different 5‐ethylidene 2‐norbornene (ENB) and ethylene contents were vulcanized with different types and compositions of peroxide and coagents. The mechanical and vulcametric properties of these samples were measured and compared. The type of peroxide, coagent, and EPDM grade affected the mechanical, thermal, and vulcametric properties of the EPDM rubber to some extend. Use of aromatic peroxide and coagent increased the thermal stability slightly. Mechanical properties were changed very slightly with the change of peroxide type for the same content of peroxide and coagent. Scorch time and cure time decreased with initial increase of the peroxide content. EPDM compound vulcanized with BBPIB peroxide and TAC/S coagent has higher cure time than EPDM compound vulcanized with DMBPHa peroxide and TMPTMA coagent. Coran method was used for the modeling of experimental data. Velocity constant for the formation of peroxide radical and polymer radical were found for each case. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2009     

过氧化物硫化氯磺化聚乙烯的试验研究

研究过氧化物硫人经氯磺化聚乙烯胶料的硫化特性，探讨共硫化剂、防老剂等对胶料在充化特性的影响。试验表明，ＣＳＭ胶料采用有机过氧化物硫化时的抗焦烧性及耐热老化性比采用金属氧化物、硫黄及季戊四醇硫化要好；共硫化剂采用ＨＶＡ－２、ＴＡＩＣ；在有炭黑填充的配方中用防老剂ＮＢＣ，在非炭黑填充的配方中用防老剂ＤＤＡ／４０２０时胶料综合性能较好。     

Dynamically vulcanized blends of polypropylene and ethylene octene copolymer: Influence of various coagents on mechanical and morphological characteristics

Dynamically cured blends of polypropylene (PP) and ethylene octene copolymer (EOC) with coagent‐assisted peroxide curative system were prepared by melt‐mixing method. It was well established that PP exhibits β‐chain scission in the presence of peroxide. Principally, incorporation of a coagent increases the crosslinking efficiency in the EOC phase and decreases the extent of degradation in the PP phase. The present study mainly focused on the influence of three structurally different coagents, namely, triallyl cyanurate (TAC), trimethylol propane triacrylate (TMPTA), and N,N′‐m‐phenylene dimaleimide (MPDM), on the mechanical properties of the PP/EOC thermoplastic vulcanizates (TPVs). The reactivity and efficiency of different coagents were characterized by cure study on EOC gum vulcanizate. TAC showed the highest torque values followed by MPDM and TMPTA. Significant improvements in the physical properties of the TPVs were inferred with the addition of coagents. Among the three coagents used, MPDM showed the best balance of mechanical properties in these TPVs. The results indicated that torque values obtained during mixing and the final mechanical properties can be correlated. Different aspects were explained for the selection of a coagent that forms a product with desired properties. The phase morphologies of the TPVs prepared were studied by scanning electron microscopy. Tensile fracture patterns were also analyzed to study the failure mechanism of the samples. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2009     

Dynamically vulcanized polypropylene/styrene–butadiene rubber blends: The effect of a peroxide/bismaleimide curing system and composition

Polypropylene (PP)/styrene–butadiene rubber blends were studied with special attention given to the effects of the blend ratio and dynamic vulcanization. Dicumyl peroxide (DCP) was used as the curing agent in combination with N,N′‐m‐phenylene bismaleimide (BMI) as the coagent for the curing process. Outstanding mechanical performance, especially with regard to the elongation at break, and better resistance to compression set were achieved with the dynamic vulcanization; this indicated that the DCP/BMI system also acted as a compatibilizing agent. This phenomenon was also confirmed by Fourier transform infrared spectroscopy of the insoluble material, the crystallinity degree of the PP phase (as investigated by X‐ray diffractometry), and scanning electron microscopy. The dynamic mechanical properties of the nonvulcanized and vulcanized blends were also investigated. The aging resistance of the blends was also evaluated. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2011     

动态硫化POE/PP的交联及助交联

以纯度40%的双叔丁基过氧化二异丙基苯(BIPB)为交联剂,研究了BIPB用量和作用时间以及HVA-2的用量对动态硫化的聚烯烃弹性体/聚丙烯(POE/PP)的影响。研究结果表明:当BIPB用量为1.2份时,体系的综合力学性能最佳;动态硫化时间为6 min时,POE/PP力学性能较好。助交联剂N,N'-间苯撑双马来酰亚胺(HVA-2)的加入能够明显提高POE/PP共混物的拉伸和撕裂强度,并且随着HVA-2用量的增加,强度增加;但随HVA-2用量的增加,拉断伸长率降低。     

Compatibilization and properties of SAN/EPDM blends with the addition of coagents

SAN and EPDM are not miscible. In this work, the dry blending of SAN and EPDM using Centrex (acrylonitrile/EPDM/styrene graft copolymer) and EPMMA (EPDM‐g‐Mah) as coagents was studied. Centrex content was used at 6–20 wt %. EPMMA content in the mixture was 20 wt %. The effects of coagent type and content on the mechanical properties and morphology were investigated. SEM micrographs of SAN/EPDM/Centrex and SAN/EPDM/EPMMA blends showed that both Centrex and EPMMA have an effective role in forming a finer morphology. For the ternary blends, the addition of coagent resulted in a significant reduction in the size of the dispersed phase. The mechanical properties of SAN/EPDM/coagent blends were improved significantly in comparison to the simple SAN/EPDM blends. SAN/EPDM/Centrex blends showed higher stress‐at‐break and SAN/EPDM/EPMMA blends showed higher impact strength. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2008     

Influence of Coagents on the Silane Grafting and Cross-linking of Polypropylene

The grafting of vinyltrimethoxysilane (VTMS) onto polypropylene (PP) was carried out in a melt process, and the cross-linking in the hot water. The influence of coagents, i.e., styrene (St), divinylbenzene (DVB), triallyl isocyanurate (TAIC) and trimethylolpropane triacrylate (TMPTA) on the grafting degree, gel percentage, melt flow index (MFI) of the VTMS modified PP were investigated. It was found that the incorporation of the coagents influenced the grafting and cross-linking of VTMS. The crystallization behavior and crystal structure of the coagent assisted VTMS-cross-linked PP were studied by differential scanning calorimetry (DSC) and wide-angle X-ray diffraction (WXAD), respectively. The thermogravimetric analysis (TG) studies indicate that the thermal stability of VTMS-cross-linked PP was improved by the incorporation of coagents.     

羧基丁腈橡胶的硫化性能

用无硫硫化体系、低硫高促进剂硫化体系、普通硫黄硫化体系、过氧化物硫化体系、金属氧化物硫化体系和硫黄／金属氧化物硫化体系对羧基丁腈橡胶（XNBR）进行了硫化,研究了XNBR的硫化性能、物理机械性能、耐老化性能、压缩永久变形和耐油性能。结果表明,采用普通硫黄硫化体系、硫黄／金属氧化物硫化体系所得到的XNBR硫化胶的综合物理机械性能较好;用无硫硫化体系、低硫高促进剂硫化体系和硫黄／金属氧化物硫化体系所得到的XNBR硫化胶的耐老化性能较好;用硫黄／金属氧化物硫化体系所得到的XNBR硫化胶的耐磨性、压缩永久变形较好;用普通硫黄硫化体系和硫黄／金属氧化物硫化体系所得到的XNBR硫化胶的耐油性能较好。