高乙烯基丁二烯／BR溶液共混橡胶的性能

在５０Ｌ聚合釜中，以ＭｏＣｌ５－Ａｌ（ｉ－Ｂｕ）３－ＰｈＯ（ｍ－ＣＨ３）为催化剂，烯丙基溴为分子阳调节 合成高乙烯基聚丁二烯橡胶（ＨＶＢＲ），再加入ＢＲ进行溶液共混，制得了ＨＶＢＶ／ＢＲ共混生胶。结果表明，随ＨＶＢＲ用量增加，ＨＶＢＲ／ＢＲ共混生胶的屈服强度和门尼粘度提高，加工行为优于ＨＶＢＲ和牌号为ＣＢ４５ＮＦ的低顺式聚丁二烯橡胶；其硫化胶的耐磨性及回弹性降低，而硬订和耐老化性有所提高。并保持了     

高乙烯基聚丁二烯／BR溶液共混橡胶的性能

在５０Ｌ聚合釜中，以ＭｏＣｌ＿５－Ａｌ（ｉ－Ｂｕ）＿３－ＰｈＯ（ｍ－ＣＨ＿３）为催化剂，烯丙基溴为分子量调节剂。先合成高乙烯基聚丁二烯橡胶（ＨＶＢＲ），再加入ＢＲ进行溶液共混，制得ＨＶＢＲ／ＢＲ共混生胶。结果表明，随ＨＶＢＲ用量增加，ＨＶＢＲ／ＢＲ共混生胶的屈服强度和门尼粘度提高，加工行为优于ＨＶＢＲ和牌号为ＣＢ４５ＮＦ的低顺式聚丁二烯橡胶；其硫化胶的耐磨性及回弹性降低，而硬度和耐老化性有所提高。并保持了ＨＶＢＲ低生热的优点。当ＨＶＢＲ用量为４０～６０份时，ＨＶＢＲ／ＢＲ共混硫化胶的综合性能优良，拉伸强度约为１６ＭＰａ，３００％定伸应力约为１０ＭＰａ，撕裂强度大于３０ｋＮ／ｍ，扯断伸长率为４２０％～４５０％。     

镍系新催化剂合成顺丁橡胶的研制

研究了Ｎｉ（ｎａｐｈ）２－Ａｌ（ｉ－Ｂｕ）３－（ＢＦ３．ＯＥｔ２＋ＲＯＨ０体系催化丁二烯聚合的特点，考查了ＲＯＨ／Ｂ摩尔比，Ａｌ／Ｎｉ摩尔比，Ｎｉ／Ｂｄ摩尔比等反应条件对聚合活性及聚合产物分子量的影响。     

氯硅烷在M,oO2Br2催化体系引发丁二烯聚合反应中的作用

考察了在以ＭｏＯ２Ｂｒ２为主催化剂，Ａｌ（ｉ－Ｂｕ）２ＯＰｈＣＨ３为助催化剂的体系中添加第三组分氯硅烷系列组成的Ａｌ－Ｍｏ－Ｃｌ催化体系引发丁二烯的聚合。结果表明在适量氯硅烷范围内，随Ｃｌ／Ｍｏ上升，催化活性有所提高，聚合物分子量显著下降，但分子量分布以及１，２－链节含量变化较小。讨论了氯硅烷的作用     

镧系金属化合物催化苯乙烯和双烯烃的共聚：苯乙烯和异戊二烯…

采用稀土催化体系Ｎｄ（Ｆ３ＣＯ２）３－ＢｒＣ５Ｈ１１－ＲｍＡｌＨ３－ｍ（Ｎｄ－Ｂｒ－Ａｌ），以甲苯为溶剂，在５０℃恒温水浴中进行苯乙烯和异戊二烯共聚合。结果表明，由Ａｌ（Ｏｃｔ）３或Ａｌ（ｉ－Ｂｕ）３组成的催化体系可制备以顺式－１，４结构为主的共聚物，在后者组成的催化体系中，当Ａｌ／Ｎｄ＝５（摩尔比，下同），Ｂｒ／Ｎｄ＝５时，聚合活性最高。经ＩＲ，ＮＭＲ检测表征了共聚物微观结构。同时，用π－烯丙基     

胺对镍系催化了二烯聚合规律的影响

以二乙胺为例研究了胺对Ｎｉ（ｎａｐｈ）２－Ａｌ（－Ｂｕ）３－ＢＦ３·ＯＥｔ２＋ｎ—Ｃ８Ｈ１７ＯＨ（简称Ｎｉ－Ａｌ－Ｂ＋ＲＯＨ）和Ｎｉ（ｎａｐｈ）２－Ａｌ（ｉ－Ｂｕ）３－ＢＦ３·ＯＥｔ２＋ＣＨ３ＣＯＯＣ４Ｈ９（简称Ｎｉ—Ａｌ—Ｂ＋ＢＡ）两体系聚合活性和聚合物分子量的影响，并与Ｎｉ—Ａｌ—Ｂ体系进行了对比．考察了通常条件下肢的允许含量，讨论了有胺存在时Ｎｉ／Ｂｄ、Ａｌ／Ｎｉ、Ａｌ／Ｂ摩尔比的变化对聚合规律的影响。结果表明：胺的含量高于２０ｐｐｍ时将使聚合活性和分子量降低，提高催化剂用量可以抑制胺的不利影响。     

镧系金属化合物催化苯乙烯和双烯烃的共聚──苯乙烯和异戊二烯共聚合制备高顺式－1，4嵌段共聚物

采用稀土催化体系Ｎｄ（Ｆ_３ＣＯ_２）_３－ＢｒＣ_５Ｈ_（１１）－Ｒ_ｍＡｌＨ_（３－ｍ）（Ｎｄ－Ｂｒ－Ａｌ），以甲苯为溶剂，在５０℃恒温水浴中进行苯乙烯（Ｓｔ）和异戊二烯（Ｉｐ）共聚合。结果表明，由Ａｌ（Ｏｃｔ）－３组成的催化体系可制备以顺式－１，４结构为主的共聚物；在后者组成的催化体系中，当Ａｌ／Ｎｄ＝５（摩尔比，下同），Ｂｒ／Ｎｄ＝５时，聚合活性最高。经ＩＲ，ＮＭＲ检测表征了共聚物的微观结构。同时，用π－烯丙基型配位机理和返扣配位机理对实验结果进行了定性解释。     

端羟基丁腈橡胶的合成

在１０Ｌ和５０Ｌ不锈钢聚合釜中，以合成端羟基丁腈橡胶（ＨＴＢＮ）为目的，用Ｈ２Ｏ２作引发剂、乙醇作溶剂，研究了本二烯（Ｂｄ）和丙烯腈（ＡＮ）的溶液共聚合。结果表明，在ＡＮ／Ｂｄ为１０／９０，１５／８５，２０／８０，Ｈ２Ｏ２用量为４．０／８．０ｇ，乙醇用量为７０－８０克，１１０－１２０℃和１２０－１５０ｍｉｎ的聚合条件下，可以得到Ｍ。为２３００－４２００、羟值（ＫＯＨ）为４０．０－８０．０ｍｇ／ｇ、     

金—钼酸盐—丁基罗丹明B体系显色反应研究

研究了在高氯酸和聚乙烯醇（ＰＶＡ）存在下，金与钼酸盐和丁基罗丹明Ｂ（ＢＲＢ）的显色反应。其适宜条件ＣＨＣｌＯ４＝１．５ｍｏｌ／Ｌ，ＣＭｏＯ２－４＝９．１×１０－４ｍｏｌ／Ｌ，ＣＢＲＢ＝３．８×１０－５ｍｏｌ／Ｌ及０．０８％ＰＶＡ。金钼杂多酸—丁基罗丹明Ｂ离子缔合物的最大吸收位于５７０ｎｍ，表观摩尔吸光系数为３．３６×１０６Ｌ·ｍｏｌ－１·ｃｍ－１，金量在０～４０μｇ／Ｌ范围内服从比尔定律，测定极限（Ｓ／Ｎ＝３）０．９０μｇ／Ｌ（ｎ＝１０），对于２８μｇＡｕ（Ⅲ）／Ｌ测定的相对标准偏差２．１％（ｎ＝７）。缔合物至少可稳定５ｈ，摩尔比Ａｕ∶ＢＲＢ＝１∶３。考察了４４种共存离子的影响，大多数常见离子不干扰，用活性炭分离富集金，对砂矿和炭粉中金的测定，结果满意。     

异丁烯两段催化氧化制甲基丙烯酸催化剂的研究 Ⅱ．甲基丙烯醛气相氧化制甲基丙烯酸的杂多酸盐催化剂的研究

本文报道用于甲基丙烯醛（ＭＡＬ）选择氧化制甲基丙烯酸（ＭＡＡ）的ＰＭｏＶ杂多酸盐催化剂的研究结果。ＩＲ和ＸＲＤ考察结果表明，本文所研究的催化剂均具有稳定的Ｋｅｇｇｉｎ结构，催化剂物相组成为Ｈ（４－２ｙ－２）ＰＯ４（ＭｏＯ３）（１２－ｘ）（ＶＯ３）ｘＣＵｙＣｓｚ。在３００℃，原料气组成ＭＡＬ：Ｈ２Ｏ：Ｏ２：Ｎ２＝１：１０：３：３２．体积空速１２００ｈ（－１）的条件下，最佳催化剂的ＭＡＬ转化率为９４．１％，ＭＡＡ选择性达８８．７％。     

Effect of vinyl and phenyl group content on the physical and dynamic mechanical properties of HVBR and SSBR

High‐vinyl polybutadiene rubber (HVBR) and solution‐polymerized styrene–butadiene rubber (SSBR) can meet the requirements of high‐performance tires due to their excellent wet skid resistance and lower rolling resistance. In this paper, the effects of the vinyl and phenyl groups and their contents on the vulcanization behavior, mechanical strength, fatigue resistance, heat resistance, and wear resistance of HVBR and SSBR were investigated, and the dynamic viscoelasticities of HVBR and SSBR vulcanizates with or without carbon black were explored by dynamic mechanical analysis (DMA). The experimental results showed that the vinyl groups contributed more to the wear resistance and fatigue resistance of vulcanizates than the phenyl groups, but the phenyl groups contributed more to the mechanical strength of the vulcanizates than the vinyl groups. The DMA results showed that the vinyl and phenyl groups could significantly improve the road‐gripping capability and wet skid resistance of HVBR and SSBR vulcanizates, but carbon black could slightly weaken the effect of vinyl and phenyl groups on the wet skid resistance of vulcanizates, and the effect of carbon black on vinyl groups was more significant. Despite the presence of carbon black, the phenyl groups contributed more heat buildup to the vulcanizates than the vinyl groups. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 135, 45975.     

钼系高乙烯基聚丁二烯橡胶用于半钢轮胎胎面的研究

采用质轻、优异耐老化性、低生热和高抗湿滑性的高乙烯基聚丁二烯橡胶(HVBR)部分替代不同结构含量的SSBR用于轮胎应用配方。高性能成品轮胎初步测试结果表明,HVBR的取代量为15%~30%时,胎面胶的耐磨性、低生热和抗湿滑性等综合性能最佳,操作油的加入可以很好地改善胶料的加工性,提高炭黑分散性、耐疲劳性、耐低温性和回弹性,但是耐磨性变差。当HVBR代替15份SSBR2550时,轮胎抗湿滑性与滚动阻力与现有轮胎相当,且耐老化性和耐磨性均略高于原配方胎。     

HVBR在高性能成品半钢胎面胶中的应用研究

研究高乙烯基聚丁二烯橡胶（HVBR）在高性能半钢成品胎中的工艺性能和成品胎的室外性能,对HVBR在成品胎中的综合性能进行了试验研究。结果表明,相比于原配方轮胎,HVBR部分代替SSBR胶料的乘坐舒适度和耐磨性略好。含HVBR轮胎的动力和挤出性能较好,滚动阻力、高速耐久性、干地操控性和经济性与原配方相当。     

高乙烯基聚丁二烯交联四丙氟橡胶性能的研究

采用不同量的高乙烯基聚丁二烯橡胶(HVBR)作为助交联剂,以过氧化二异丙苯引发交联四丙氟橡胶(FEPM),制备具有新型交联结构的FEPM/HVBR共混胶,同时表征该橡胶的硫化特性、物理性能、断面形貌、溶胀度和热性能。结果表明:随着HVBR用量的增大,共混胶的硬度和拉伸强度增大,拉断伸长率降低,加工安全性和流动性变优;共混胶的玻璃化温度与FEPM接近,且随着HVBR用量的增大,共混胶的玻璃化温度升高,耐热性能提高。     

官能化高乙烯基聚丁二烯橡胶与丁腈橡胶共混胶的性能

以氢化钠为活性剂、马来酸酐为改性剂,通过负离子反应对高乙烯基聚丁二烯橡胶(HVBR)进行官能化改性制备了官能化HVBR(FHVBR)。考察了FHVBR与丁腈橡胶(NBR)共混的质量比对FHVBR/NBR共混胶硫化特性、力学性能、耐热氧老化性能和电性能的影响,并通过差示扫描量热仪和扫描电子显微镜探讨了共混胶的两相相容性。结果表明,随着NBR用量的增加,FHVBR/NBR共混胶的硫化时间缩短、硫化效率提高,定伸应力和硬度增大,耐老化性能得以改善。NBR用量的增加使得FHVBR/NBR共混胶对不同频率下的微波吸收能力增强,共混胶的电阻率下降,导电性增强。然而,NBR用量增加导致共混胶的拉伸强度略有下降。     

TPI/HVBR共混物用于胎面胶的研究

在传统的胎面胶配方NR／SBR1500（并用此为60／40）和SBR1712／SBR1500（并用比为60／40）的基础上，采用高反式－1，4－聚异成二烯（TPI）和／或高乙烯基聚丁二烯橡胶（HVBR）取代或部分取代SBR1500，研究共混物的物理性能和动态粘弹性。结果表明，添加了TPI和HVBR的胎面胶，其力学性性能可满足使用要求，定伸应力和抗屈挠疲劳性较大提高，滚动阻力和动态生势明显降低，而抗湿滑性仍有较高的保持率，达到了滚动阻力和抗湿润性能的良好兼备。相对而言，NR／TPI／HVBR并用胎面胶具有量的滚动阻力和生热，而SBR／TPI／HVBR并用胎面胶具有更好的抗湿滑性、抗屈挠疲劳性和耐磨性。     

The Effect of Epoxidized Natural Rubber (ENR-50) or Polyethylene Acrylic Acid (PEA) as Compatibilizer on Properties of Ethylene Vinyl Acetate (EVA)/Natural Rubber (SMR L) Blends

The effect of epoxidized natural rubber (ENR) or polyethylene acrylic acid (PEA) as a compatibilizer on properties of ethylene vinyl acetate (EVA)/natural rubber (SMR L) blends was studied. 5 wt.% of compatibilizer was employed in EVA/SMR L blend and the effect of compatibilizer on tensile properties, thermal properties, swelling resistance, and morphological properties were investigated. Blends were prepared by using a laboratory scale of internal mixer at 120°C with 50 rpm of rotor speed. Tensile properties, thermal properties, thermo-oxidative aging resistance, and oil swell resistance were determined according to related ASTM standards. The compatibility of EVA/SMR L blends with 5 wt.% of compatibilizer addition or without compatibilizing agent was compared. The EVA/SMR L blend with compatibilizer shows substantially improvement in tensile properties compared to the EVA/SMR L blend without compatibilizer. Compatibilization had reduced interfacial tension and domain size of ethylene vinyl acetate (EVA)/natural rubber (SMR L) blends.     

Characterization of polymeric biocomposite based on poly(vinyl alcohol) and poly(vinyl pyrrolidone)

Biocompatible and easily available materials from dairy production waste were used for modification of water‐soluble polymeric blends of Poly(vinyl alcohol) (PVA) and Poly(vinyl pyrrolidone) (PVP). The resulting biocomposites of PVA/PVP with various concentrations of lactose (L) or calcium lactate (CL) (0, 5, 15, 25, 35 wt%) were prepared by using a solvent cast technique and then characterized by optical microscopy, tensile test, water content determination, differential scanning calorimetry (DSC), Fourier transform infrared spectroscopy equipped by attenuated total reflectance device, and also tested for biodegradability. The films were transparent with a smooth surface. The results confirm that L and CL work as fillers in polymeric matrix. The tensile investigations showed enhanced Young's modulus (E) and tensile strength for low‐filled of composite materials (up to 5 wt% L and 15 wt% CL). The biodegradation test in aquatic conditions revealed improved biodegradability of modified blends. Both L and CL seem to be suitable for the modification of polymers, which can be convenient from economical and environmental point of view. POLYM. COMPOS., 27:147–152, 2006. © 2006 Society of Plastics Engineers.     

Study on epoxy modification of HVBR and damping performance of EHVBR/hindered phenol hybrids

In this study, epoxidized high vinyl polybutadiene rubber (EHVBR) was prepared by the epoxidation reaction of high vinyl polybutadiene rubber (HVBR) in toluene using peroxyacetic acid as oxidant. The effects of reaction temperature and peroxyacetic acid concentration on the epoxidation degree of EHVBR were investigated by Fourier transform infrared (FTIR) spectroscopy and nuclear magnetic resonance (NMR), and the damping properties of organic hybrids consisting of EHVBR and different contents of hindered phenols tetrakis [methylene-3-(3-5-di-tert-butyl-4-hydroxyphenyl) propionyloxy] methane (AO-60) and 3,9-bis[1,1-dimethyl-2{β-(3-tert-butyl-4-hydroxy-5-methylphenyl)propionyloxy} ethyl]-2,4,8,10-tetraoxaspiro[5,5]undecane (AO-80) were explored by dynamic mechanical analysis (DMA). FTIR and NMR analyses indicated that the epoxidation occurred on the C=C double bonds of HVBR molecular chains and the epoxidation degree of EHVBR could be adjusted from 5 to 65% through control of the reaction temperature and peroxyacetic acid concentration. DMA and physical mechanical measurements indicated that the introduction of AO-60 and AO-80 could simultaneously improve the damping properties and mechanical properties of the EHVBR/AO-60 and EHVBR/AO-80 hybrids. The blending ratios of EHVBR/AO-60 = 100/60 and EHVBR/AO-80 = 100/60 showed better damping properties and the effective damping temperature ranges were extended from 13.1 to 52.3 °C and from 16.1 to 54 °C, respectively. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136, 47196.     

Stable ion bond for high damping,high wet resistance,and low rolling resistance high vinyl polybutadiene rubber-based dicarboxylate ionomer

Since the implementation of European Union (EU) tire label, the focus of recent attention has been focused on high performance green tire with low rolling resistance, high wet resistance, low noise, and excellent auto-braking properties. However, it is a significant challenge to simultaneously achieve these performances for rubber materials. In this research, we developed a novel concept on the construction of stable ion bonds for high performance high vinyl polybutadiene rubber (HVBR)-based dicarboxylate ionomers. HVBR-based dicarboxylate sodium ionomer (hereafter referred as Na ionomer) was fabricated through complexation reaction of some or all of carboxylic functional groups on the preprepared maleinized HVBR molecular chains with sodium hydroxide. In the case of Na ionomers, the formation of sodium carboxylate group was certified from Fourier transform infrared spectra. Physical and dynamic mechanical measurements indicated that the tensile strength, wear resistance, wet skid resistance, dry sliding resistance, low rolling resistance, and low heat buildup of the Na ionomer were significantly improved compared to that of HVBR, and Na ionomer simultaneously showed better damping properties and the effective damping temperature range was broadened from −8.8 to 30.1°C, which was closer to the room temperature. Consequently, the approach and results collectively represent a significant advance toward the development of high performance green tire rubber materials.