动态硫化乙烯-辛烯共聚物/硅橡胶热塑性弹性体性能的影响因素

采用Haake转矩流变仪制备了乙烯-辛烯共聚物(POE)/硅橡胶(MVQ)动态硫化热塑性弹性体(TPV),考察了共混温度、转速、动态硫化时间对POE/MVQ共混物硫化特性、TPV物理机械性能及加工特性的影响,观察了硫化剂不同投料方式下TPV的外观形貌。结果表明,在共混温度为130℃、转速为50～60 r/min、动态硫化时间约为8 min的条件下,采用POE与MVQ混匀后分3批加入硫化剂的方式,所得POE/MVQ TPV的综合性能较好,表面光滑且有韧性。     

甲基丙烯酸锌对乙烯-辛烯共聚物/聚丙烯热塑性硫化胶性能的影响

以双叔丁基过氧化二异丙基苯(BIPB)为硫化剂、甲基丙烯酸锌(ZDMA)为填料,采用动态硫化法制备了乙烯-辛烯共聚物(POE)/聚丙烯(PP)热塑性硫化胶(TPV),研究了ZDMA的热性能,并考察了ZDMA与BIPB对混炼胶硫化特性及TPV物理机械性能的影响,表征了TPV的微观形貌。结果表明,ZDMA处于炼胶温度时不会发生分解和降解,且在165℃左右与BIPB分解产生的自由基发生反应,因此,加工温度确定为170℃左右;随着BIPB用量的增加,POE/PP TPV的拉伸强度和撕裂强度先增大后减小,扯断伸长率降低,而邵尔A硬度增大,最佳BIPB用量为1.0份;随着ZDMA用量的增加,POE/PP混炼胶的硫化速率和相对交联密度逐渐增大,POE/PP TPV的拉伸强度和撕裂强度先增大后减小,扯断伸长率和永久变形逐渐降低,邵尔A硬度和100%定伸应力呈上升的趋势,ZDMA最佳用量为10~15份;添加ZDMA的TPV断面粗糙,界面间的相互作用力增强。     

聚丙烯/乙烯-辛烯-1共聚物共混体系流变性能研究

采用高级流变扩展系统(ARES)研究了聚丙烯(PP)/乙烯-辛烯共聚物共混体系的流变性能,探讨了乙烯-辛烯共聚物含量和 PP 种类对共混体系储能模量、剪切黏度和零切黏度的影响。实验结果显示,PP 结构和 POE 含量对 PP/POE 共混体系的剪切流变性能有显著影响,随着 POE 含量的增加,PP1/POE 共混体系的储能模量和剪切黏度增加的幅度明显小于 PP2/POE 共混体系,PP1/POE 共混体系和 PP2/POE 共混体系的储能模量和剪切黏度增加幅度较大分别发生在 POE 含量为20%～30%和10%～20%,即共混体系发生"脆—韧"转变阶段。PP/POE 共混体系中存在界面滑移现象,且 PP 和 POE 的界面相容性对界面滑移现象影响较大,其中 PP1/POE 的界面滑移比PP2/POE 的界面滑移更加明显。     

乙烯-辛烯共聚物/再生丁基橡胶热塑性弹性体的制备及其性能

采用动态硫化法制备了乙烯-辛烯共聚物(POE)/再生丁基橡胶(RIIR)热塑性弹性体(TPE),考察了共混比、硫黄、软化剂白油和炭黑N330对TPE力学性能的影响,研究了TPE的动态力学性能和流变性能。结果表明,当POE/RIIR(质量比)为2/1、硫黄为0.5份、软化剂白油为20份、炭黑为30份时,TPE的综合力学性能较佳;POE和RIIR具有较好的相容性;当体系中加入白油时,TPE的动态复数黏度(η*)降低,炭黑的加入使TPE的η*迅速增大。     

茂金属乙烯-辛烯共聚物的研究现状和展望

分析茂金属乙烯-辛烯共聚物(POE)的研究现状和发展趋势.当前研究主要包括改性POE直接用作弹性体材料、POE发泡材料、POE增韧其它聚合物以及动态硫化POE/热塑性树脂热塑性弹性体等方面;茂金属POE凭借优异的综合性能,已成为极具发展前景的新型材料.     

乙烯—辛烯共聚物对RB／NBR共混胶性能的影响

通过聚合物共混来改善均聚物的性能是一种有效的、低成本的途径。一般情况下,聚合物相互间是不相容的,所以需使用相容剂来改善相容性。从理论上讲,相容剂能迁移到相间的界面处,从而降低界面张力,减少分散相尺寸并稳定共混胶的形态。     

乙烯-辛烯共聚物接枝苯乙烯-丙烯腈共聚物的合成及其表征

用苯乙烯(St)、丙烯腈(AN)2种单体和乙烯一辛烯共聚物(POE)进行溶液接枝共聚合反应,制备了乙烯-辛烯共聚物接枝苯乙烯-丙烯腈共聚物(POE-g-SAN),探讨了接枝共聚反应条件,并对POE-g-SAN进行了表征.结果表明,接枝共聚反应的接枝率(GR)和接枝效率(GE)均随着St/AN(质量比)的减小而稍有增大,当POE/St-AN(质量比)为50/50时,GR与GE达到最大值;增加BPO用量有利于接枝反应;当反应物POE与St-AN在甲苯中的质量分数为27.5%时,GR与GE达到最大值;在反应前10 h,随着反应时间的延长,GR增大,GE在4 h时达到最大值77.8%,在反应10 h后,接枝反应几乎不再进行;在POE与St-AN接枝共聚反应中,POE已接枝了SAN支链,且GR越大,SAN支链越多;POE-g-SAN有2个玻璃化转变温度(Tg),约为-50℃和110℃;随着GR的增大,POE-g-SAN中POE相的Tg升高,熔融温度和熔融热均降低;随着共单体中AN配比量的增加,POE-g-SAN中SAN相的Tg升高.     

乙烯-辛烯共聚物/SBR共混物的研究

研究了乙烯-辛烯共聚物（POE）/SBR共混物的力学性能和相态结构。结果表明,随着POE8180（辛烯质量分数为0.28）/SBR共混比（除50/50外）增大,共混物的力学性能提高,POE8003（辛烯质量分数为0.18）用量不超过40份时,随着POE8003/SBR共混比增大,共混物的力学性能提高;POE8003制成粘度较大的炭黑母粒后再与SBR母炼胶共混,可提高共混物的力学性能;POE8180与SBR的共混温度为120℃时共混物的综合力学性能最佳;POE8180/SBR共混物为两相结构,POE8180/SBR共混比为40/60时共混物呈互穿网络结构。     

交联型竹粉/苯乙烯-异戊二烯嵌段共聚物/溴化丁基橡胶吸振复合材料

将竹加工的边角料粉碎并用乙烯基三(β-甲氧基乙氧基)硅烷偶联剂处理,再与苯乙烯-异戊二烯嵌段共聚物和溴化丁基橡胶的共混物进行复合,在过氧化二异丙苯(DCP)引发剂的作用下制得交联型橡胶吸振复合材料.用硫化仪考察了不同温度下材料转矩随时间的变化情况,并对材料的动态力学性能进行了分析.结果表明,最佳混炼温度是125～155℃(控制物料的实际温度不超过145℃);在170 ℃下用DCP引发交联可得到外观平整光滑的具有类似竹材加工性的复合材料;当竹粉和DCP用量分别为45份(质量,下同)和0.8份时,复合材料具有较好的力学性能、较宽的玻璃化转变温度范围和较大的损耗因子,吸振减震性能较好,但上限使用温度应不超过150℃.     

废旧丁腈橡胶粉/聚丙烯复合材料的非等温结晶行为

采用熔融共混法制备了废旧丁腈橡胶粉/聚丙烯(WNBR/PP)和废旧丁腈橡胶粉/聚丙烯接枝马来酸酐/聚丙烯(WNBR/PP-g-MAH/PP)复合材料,采用差示扫描量热仪研究了PP、WNBR/PP及WNBR/PP-g-MAH/PP复合材料的非等温结晶过程,并通过Jeziorny方程研究了复合材料的非等温结晶动力学。结果表明,随降温速率的增大,所有试样的结晶峰温和结晶起始温度均向低温偏移,结晶度减小,结晶速率增大。WNBR能起到异相成核的作用,提高了PP的结晶速率,并且导致PP结晶成核和生长机理发生改变。     

Reinforcement of irradiated waste polyamide/reclaimed rubber powder composites with glass fiber

This article presents a preliminary investigation on the effects of gamma radiation and incorporating glass fiber (GF) into recycled polyamide/waste rubber powder (50/50) on mechanical, thermal properties. The samples were characterized by mechanical and thermal behaviors of the composites in different proportions. The incorporation of GF was found to improve the elastic modulus, tensile, and thermal properties and also improved by irradiation. POLYM. COMPOS., 37:1539–1548, 2016. © 2014 Society of Plastics Engineers     

Gamma irradiation of treated waste rubber powder and its composites with waste polyethylene

This investigation was undertaken to prepare composites of waste polyethylene (WPE) with concentrations of 5, 15, and 25 wt% of waste rubber powder (WRP) and to determine the changes in properties of these composites before and after treatment of the WRP with acrylic acid. Mechanical, physical, thermal, FTIR, and SEM investigations showed that treated and gamma‐irradiated WRPs gave better properties than untreated ones. Hence, a simple method to prepare composites based on recycled polyethylene and waste rubber powder could be achieved without using expensive treatment of the polymeric wastes. J. VINYL ADDIT. TECHNOL., 2011. © 2011 Society of Plastics Engineers     

Performance of talc/ethylene-octene copolymer/polypropylene blends

Polypropylene-based compounds are increasingly attractive because of low cost, processability, and good balance of properties. In recent years, metallocene ethylene-octene copolymers have started displacing EPR and EPDM as an impact modifier for PP. This study examines the effect of compounding conditions and composition on the properties of talc/ethylene-octene copolymer/PP compounds. The mechanical properties of the compounds were not significantly affected by the mixing conditions on a laboratory twin screw extruder. The use of 30 wt% of talc provided a twofold increase in tensile modulus compared with pure PP. Impact resistance of filled and unfilled compounds was found to increase rapidly once the copolymer concentration reached around 20 wt% based on the polymer phase. Modulus and tensile strength decreased linearly with copolymer concentration. Four different commercial maleic anhydride-grafted PPs were tested as interfacial modifiers. In the best cases, a slight tensile strength increase was observed when using between 2 and 10 wt% of modified PP.     

废旧轮胎橡胶粉/苯乙烯-丁二烯-苯乙烯嵌段共聚物/石油树脂复合改性沥青的制备及性能

以苯乙烯-丁二烯-苯乙烯嵌段共聚物（SBS）、废旧轮胎橡胶粉和石油树脂制备复合改性沥青,并对复合改性沥青的储存稳定性、温度敏感性、高温流变性能、抗车辙性能和黏度等进行了考察。结果表明,复合改性沥青中,SBS、废旧轮胎橡胶粉及石油树脂的最佳质量分数分别为4.5%、14.0%和4.5%;石油树脂/SBS/废旧轮胎橡胶粉复合改性沥青具有较好的储存稳定性、温度敏感性和抗车辙性能。     

Graft polymerization of styrene onto waste rubber powder and surface characterization of graft copolymer

The surface of waste rubber powder (WRP) was graft-modified with styrene (St) by bulk polymerization method. The effects of styrene content, initiator mass, time of reaction, and temperature on the graft efficiency were investigated. The results showed that the graft efficiency (%) was highest when 89 wt% styrene and 0.11 g of initiator were added for reaction time of 25 h at 85 °C. The surface of graft-modified rubber powder was characterized by Fourier transform infrared spectroscopy (FTIR), scanning electron microscope (SEM), energy dispersive X-ray (EDXS) analysis, and thermogravimetric (TG/DTG) analysis. The results showed that polystyrene (PS) was grafted onto waste rubber powder, which formed a WRP/PS core–shell structure.     

橡胶共聚物与氯醚橡胶并用硫化胶的性能

往含少量促进剂2MT和高活性炭黑П234-0的丁二烯-丙烯腈-异丙基羧基甲基丙烯酸甲酯共聚物(БНЭФ-26-И)胶料中加入少量氯醚橡胶共聚物(СКЭХГ-С)(5～20份)、硫化镁(0.5～2.5份)、高活性炭黑(2.5～12.5份),可制得加工性能及综合性能优异的胶料及其硫化胶。用该并用胶生产橡胶制品,可扩大其应用领域及延长制品的使用寿命。     

Oxidation‐grafting surface modification of waste silicone rubber composite insulator powder: Characterizations and properties of EPDM/modified waste powder composites

In order to broaden the applications of waste silicone rubber composite insulator powder (WSP), modified waste powder (WSP‐KH570) was prepared by a two‐step treatment process involving improved surface oxidation approach by using acidic H₂O₂ solution and subsequently grafting of KH570. Fourier transform infrared spectroscopy in the attenuated total reflection mode (FTIR‐ATR) analysis revealed the presence of KH570 on the powder surface. The result was confirmed by thermogravimetric analysis (TGA). Blends of ethylene propylene diene monomer (EPDM) with WSP‐KH570 were prepared. The effects of WSP‐KH570 on mechanical properties and thermal properties of the blends were investigated. The WSP‐KH570 showed an observed improvement in tensile strength and elongation at break of EPDM/WSP‐KH570 blends compared with corresponding compositions of EPDM/WSP blends. The TGA cure showed that EPDM filled with WSP‐KH570 had higher thermal stability at 210–380 °C than EPDM/WSP. Dynamic mechanical analysis indicated EPDM and WSP‐KH570 were better miscible with the blend ratio (90/10). © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017 , 134, 45438.