充油反式-1,4-聚异戊二烯

用负载钛体系催化本体沉淀聚合法,合成了高门尼黏度反式-1,4-聚异戊二烯(TPI),采用干法充油工艺制备了充油胶。结果表明,随充油量的增加,TPI的加工性能明显改善;硫化胶抗湿滑性能提高;撕裂强度在充油37．5份时达到极大值;滚动阻力有所上升,其他力学性能下降,但仍能满足使用要求。TPI充油量以37．5份为宜。     

充油量对Fe系1,2-聚丁二烯橡胶性能的影响

以芳烃油作填充油，考察了6种充油量时Fe系1，2-聚丁二烯橡胶的加工工艺性能和硫化胶的性能的影响。实验结果表明，随充油量的增加，生胶门尼粘度ML100℃^1＋4值下降，可塑性增加，混炼行为变佳；硫化胶的扯断伸长率、永久变形增大，而拉伸强度和撕裂强度在充油量为20份时出现极大值，300％定伸应力、硬度、生热和磨耗等均降低。综合考虑，充油量为20份为宜。     

环保型黑双环油对镍系聚丁二烯橡胶性能的影响

以黑双环(B)作填充油,考察充油量对镍系聚丁二烯橡胶(NiBR)的加工工艺性能和硫化胶性能的影响。实验结果表明,随充油量的增加,混炼胶门尼粘度ML(1+4)100℃值下降,可塑性增加,混炼行为变佳;硫化胶的拉断伸长率、永久变形和磨耗均增大,拉伸强度和撕裂强度在充油量为15份时出现极大值,300%定伸应力和硬度降低,炭黑分布效果较好。综合考虑,充油量为15份时为宜。     

充油对反式-1,4-聚异戊二烯及其与丁苯橡胶并用胶性能的影响

采用干法充油工艺,将门尼黏度为120的反式-1,4-聚异戊二烯(TPI)充芳烃油37.5份制备充油反式-1,4-聚异戊二烯(OETPI).对TPI、OETPI的生胶、硫化胶及其与丁苯橡胶(SBR)并用硫化胶的性能进行了对比.结果表明,OETPI生胶的硬度、门尼黏度、物理机械性能都比TPI的低;OETPI混炼胶的硫化速率比TPI混炼胶的高;OETPI硫化胶的100%和300%定伸应力、邵尔A硬度、拉伸强度等物理机械性能与TPI硫化胶的相比有所降低;磨耗、压缩生热、压缩永久变形增大.与TPI/SBR混炼胶相比,OETPI/SBR混炼胶具有更高的炭黑分散度,较高的硫化速率;OETPI/SBR并用硫化胶的抗湿滑性比TPI/SBR并用硫化胶明显提高,物理机械性能、滚动阻力和动态生热变化不大,耐屈挠龟裂性能提高.     

不同门尼黏度反式-1，4-聚异戊二烯与炭黑的相互作用及其对硫化胶性能的影响

研究了不同门尼黏度反式-1,4-聚异戊二烯(TPI)与炭黑N 330的相互作用及其对TPI硫化胶物理机械性能和疲劳性能的影响.结果表明,随TPI生胶门尼黏度增大,炭黑结合胶含量减少,炭黑分散性变差,增强作用减弱.未填充炭黑TPI硫化胶的100%定伸应力和拉伸强度随TPI门尼黏度的增大而显著提高;用炭黑增强后,不同门尼黏度TPI硫化胶的100%定伸应力和拉伸强度差别不大.不同门尼黏度TPI硫化胶的压缩生热和压缩永久变形在填充炭黑后均增大,其中低门尼黏度的增加幅度显著大于高门尼黏度者;不同门尼黏度TPI硫化胶压缩生热的变化主要由炭黑与橡胶之间的作用引起.生胶门尼黏度为50～80的TPI硫化胶的动态疲劳性能较好.     

填充油对充油顺丁橡胶性能的影响

研究了填充高芳烃油和环烷油对充油顺丁橡胶性能的影响。结果表明：填充高芳烃油比填充环烷油的橡胶的拉伸强度、伸长率、生胶门尼略高，定伸应力略低；充油顺丁橡胶的门尼粘度值随填充油量的增大而减小。     

门尼粘度对反式-1,4-聚异戊二烯形状记忆材料性能的影响

考察了门尼粘度对反式-1,4-聚异戊二烯(TPI)形状记忆材料性能的影响.结果表明,随着门尼粘度的增大,材料的拉伸强度、拉断伸长率、100%定伸应力和300%定伸应力先增大后减小,在门尼粘度为70时出现最大值;材料的热刺激温度随着门尼粘度的增大先增大后减小,大约在门尼粘度为60时出现最大值;材料的形状固定率先增高后降低,回复率不变,保持在100%.     

门尼黏度对反式-1,4-聚异戊二烯及其并用胶性能的影响

研究了门尼黏度对反式-1,4-聚异戊二烯(TPI)及丁苯橡胶(SBR)／TPI并用胶性能的影响。结果表明,TPI生胶的邵尔A型硬度随其门尼黏度的增大而增大,当门尼黏度为70左右时,TPI生胶的拉伸强度、扯断伸长率、100％定伸应力、撕裂强度及结晶度出现最大值;随着TPI门尼黏度的增大,其硫化胶的力学性能提高,Goodrich压缩生热减小,撕裂强度在门尼黏度为90左右时存在最大值,TPI的最佳门尼黏度为50～100：TPI硫化胶的热氧老化以断链反应为主,门尼黏度越高,混炼难度越大,同时硫化胶的耐老化性能越差。TPI的门尼黏度越高,SBR／TPI并用胶60℃的损耗因子越低,0℃的损耗因子基本不变,其硫化胶的力学性能较好,但混炼困难,TPI适宜的门尼黏度为50～100。     

充油量对稀土催化本体聚合丁二烯—异戊二烯橡胶性能的影响

采用５种充油量对稀土催体体聚合丁二烯（Ｂｄ）－异戊二烯（Ｉｐ）共聚橡胶的加工工艺和硫化胶性能进行了研究。实验结果表明，随着充油量的增加，生胶ＭＬ值、屈服强度和拉伸强度均下降，可塑性增加，扯断伸长率变大，混炼行为变佳，胶料挤出性能由“劣“等转变为“中等“等。硫化胶的扯断伸长率随充油量的增加而增大，而拉伸强度在充油量为３０～４０份时出现极大值，湿滑指数和拉伸耐寒系数随充油量的增加而增加，充油量超过２０     

膦酸酯稀土催化体系高顺－1，4－聚丁二烯橡胶的充油效应及充油橡胶的性能

以芳烃含量约３８％的油品作填充油，对用膦酸酯（２－乙基己基膦酸单２－乙基己酯）稀土催化体系合成的高顺－１，４－聚丁二烯橡胶的充油效应及充油橡胶的性能进行了研究。结果表明，随着充油量的增加，充油生胶的可塑性增大，混炼行为和流动性得以改善，而屈服强度、拉伸强度和扯断伸长率均下降；充油硫化胶的３００％定伸应力、硬度、撕裂强度、回弹性、生热和磨耗等均降低，永久变形与抗湿滑性增加，拉伸强度大约在充油量为７０份时出现极大值。综合考虑，充油量以６０～７０份为宜。     

填充油的种类对Fe系1,2-聚丁二烯性能的影响

研究了芳烃油和环烷烃油对充油铁系1，2-聚丁二烯橡胶性能的影响。结果表明，基础胶充油后门尼粘度值下降，可塑性增加，混炼行为变佳；填充芳烃油比填充环烷烃油的橡胶在拉伸强度、撕裂强度、伸长率和生胶门尼值等方面均有所提高；充油后虽然硫化胶硬度降低，但是生热和耐磨性能提高。填充芳烃油可适当提高硫化胶的抗湿滑性，但滚动阻力也升高。环烷烃油可降低硫化胶的滚动阻力。充油可适当改善胶料的抗老化性能。     

Comparative study of silica-, nanoclay- and carbon black-filled EPDM rubbers

Silica-, nanoclay-, and carbon black (CB)-filled ethylene–propylene–diene terpolymer (EPDM) mixtures were prepared and subsequently vulcanized. Rheological properties and cure characteristics of the mixtures and mechanical properties of vulcanizates were measured. Rheological property measurements indicated the storage modulus, loss modulus, and complex dynamic viscosity of silica-filled EPDM mixtures were much higher than those of CB-filled EPDM mixtures while tan δ values were lower. The optimum cure time of silica- and nanoclay-filled EPDM mixtures increased with filler loading, whereas the values for CB-filled mixtures slightly decreased with loading. The hardness, modulus, elongation at break, and tensile strength of all the vulcanizates increased with increasing filler loading. The elongation at break of CB-filled EPDM vulcanizates increased insignificantly with CB loading. Among the three fillers, the increase of the tensile strength and elongation at break was most significant for silica-filled EPDM vulcanizates. Remarkably, for 30 phr silica-filled EPDM vulcanizates, a tensile strength and elongation at break of 23.5 MPa and 1045% was achieved, respectively. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2008     

The Effect of Filler Loading and Epoxidation on Paper-Sludge-Filled Natural Rubber Composites

The effect of filler loading and epoxidation on curing characteristics, dynamic properties, tensile properties, morphology, and rubber-filler interactions of paper-sludge-filled natural rubber compounds have been studied. Two different types of natural rubber, SMR L and ENR 50, having 0% and 50% of epoxidation and conventional vulcanization were used. Paper sludge was used as a filler and the loading range was from 0 to 40 phr. Compounding was carried out using a laboratory-sized two-roll mill. The scorch time for both rubber compounds decreased with filler loading. The cure time was found to decrease with increasing filler content for SMR L vulcanizates, whereas for ENR 50, the cure time seemed to be independent of the filler loading. Dynamic properties, i.e., maximum elastic torque, viscous torque, and tan delta, increase with filler loading in both grades of natural rubber. Results also indicate that both rubbers show increment in tensile modulus but inverse trend for elongation at break and tensile strength. However, for a fixed filler loading, ENR 50 compounds consistently exhibit higher maximum torque, modulus at 100% elongation, and modulus at 300% elongation, but lower elongation at break than SMR L compounds. In the case of tensile strength, ENR 50 possesses higher tensile strength than SMR L at 10 to 20 phr, but the difference is quite small at 30 and 40 phr. These findings might be associated with better rubber-filler interaction between the polar hydroxyl group of cellulose fiber and the epoxy group of ENR 50.     

A comparative study of aging characteristics and thermal stability of oil palm ash,silica, and carbon black filled natural rubber vulcanizates

Filler‐filled natural rubber (NR) vulcanizates were prepared by conventional laboratory‐sized two roll mills and cured using sulfuric system. The effect of thermal aging on physical properties and thermogravimetric analysis (TGA) of oil palm ash (OPA) and commercial fillers (i.e., silica vulkasil C and carbon black N330)‐filled NR vulcanizates at respective optimum loading and equal loading were studied. Before aging, the OPA‐filled vulcanizates showed comparable optimum strength as carbon black‐filled vulcanizates. The hardening of aged filler‐filled NR vulcanizates happened after aging, thereby tensile strength and elongation at break reduced while the modulus increased. Fifty phr carbon black‐filled vulcanizates showed better retention in tensile properties as compared to silica (10 phr) and OPA (1 phr). This was attributed to the addition of different filler loading and this finding was further explained when equal loading of filler‐filled vulcanizates was studied. Fourier transform infra‐red analysis showed chemical structure had changed and tensile fractured surface exhibited smooth appearance due to the deterioration in tensile properties after aging. TGA also denoted the thermal stability was depending on the amount of filler loading. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 130: 4474–4481, 2013     

Utilization of bowstring hemp fiber as a filler in natural rubber compounds

The cure characteristics and physicomechanical properties of natural rubber (standard Nigerian rubber) vulcanizates filled with the fiber of bowstring hemp (Sansevieria liberica) and carbon black were investigated. The results showed that the scorch and cure times decreased, whereas the maximum torques increased, with increasing filler loadings for both bowstring hemp fiber and carbon black filled vulcanizates. The tensile strength of both bowstring hemp fiber and carbon black filled vulcanizates increased to a maximum at a 40 phr filler concentration before decreasing. The elongation at break and rebound resilience decreased, whereas the modulus, specific gravity, abrasion resistance, and hardness increased, with increasing filler contents. The carbon black/natural rubber vulcanizates had higher tensile strength, which was about 1.5 times that of bowstring hemp fiber/natural rubber vulcanizates. This superiority in the tensile strength was probably due to the higher moisture content and larger particle size of the bowstring hemp fiber. However, the bowstring hemp fiber/natural rubber vulcanizates showed superior hardness. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci, 2008     

轻型载重子午线轮胎胎面胶配方优化设计

对轻型载重子午线轮胎胎面胶配方进行优化。试验结果表明,胎面胶采用天然橡胶5,丁苯橡胶80,顺丁橡胶15,增大炭黑和芳烃油的用量,并对配方其他组分进行适当调整,胎面胶硬度和300%定伸应力增大,拉伸强度、拉断伸长率和拉断永久变形减小,胎面胶性能能够满足轻型载重子午线轮胎使用要求,生产成本降低。     

Properties of Ferrite-Filled Natural Rubber Composites

Nickel zinc ferrite (Ni-ZnFe₂O₄)-filled natural rubber (NR) composite was prepared at various loading of ferrite. The tensile properties included in this study were tensile strength, tensile modulus and elongation at break. The tensile strength and elongation at break of the composites increased up to 40 parts per hundred rubber (phr) of ferrite and then decreased at higher loading whereas the tensile modulus was increased gradually with increasing of ferrite loading. Scanning electron microscopy (SEM) was used to determine the wettability of filler in rubber matrix. From the observation, the increase of filler loading reduced the wettability of the filler. Thermal stability of the composites was conducted by using a thermogravimetry analyser (TGA). The incorporation of ferrite in NR composites enhanced the thermal stability of NR composites. The swelling test results indicate that the swelling percentage of the composites decreased by increasing of ferrite loading. The initial permeability, μ_i and quality factor, Q of magnetic properties of NR composites achieved maximum value at 60 phr of ferrite loading for frequency range between 5000–40,000 kHz. The maximum impedance, Z _max of the NR composites was at the highest value at 80 phr ferrite loading for frequency range between 200–800 MHz.     

反式聚辛烯橡胶改性天然橡胶/顺丁橡胶共混胶的性能

研究了反式聚辛烯橡胶(TOR)改性天然橡胶(NR)/顺丁橡胶(BR)(二者质量比80/20)共混胶的性能.结果表明,采用5～15份(质量,下同)TOR改性NR/BR混炼胶的门尼黏度逐渐降低、Payne效应基本不变,共混胶的焦烧时间和工艺正硫化时间延长、硫化速率减慢.相比NR/BR硫化胶,NR/BR/TOR硫化胶的拉伸强...     

充油SEBS力学性能的研究

研究了不同牌号的橡胶填充油对苯乙烯-乙烯／丁烯-苯乙烯共聚物（SEBS）力学性能的影响及以聚丙烯（PP）为改性剂对充油SEBS进行改性的效果。结果表明：随着填充油用量的增加，拉伸强度下降，弹性回复增加，断裂伸长率也增大。PP是充油SEBS体系的一种很好的相容剂，在体系中加入PP后，随着PP用量的增大，材料的拉伸强度的增大；断裂伸长率迅速下降；回弹性和熔体质量流动速率也迅速下降。