Li/MnO2扣式电池热塑弹性体的研制

用PP与特种非极性橡胶复合研制出了低渗透的Li/MnO2扣式电池密封用热塑弹性体(TPE).其密封电池的失重率为0.283%,仅为国内普遍采用的130-50D密封电池的1/7,失重后放电容量为其2倍,仅损失12.5%.实验结果表明:该密封材料密封电池贮存期长.     

Preparation and investigation of efficient flame retardant TPE composites with piperazine pyrophosphate/aluminum diethylphosphinate system

The piperazine pyrophosphate (PPAP) combined with aluminum diethylphosphinate (AlPi) with a certain mass fraction and then incorporated into thermoplastic elastomer (TPE) composites composed of oil extended styrene–ethylene–butadiene–styrene block copolymer and polypropylene. The fire retardancy, thermal behavior, mechanical performance, and flame retardant mechanism of TPE materials were investigated in detail. The results demonstrated that 1.6 mm TPE composites reached UL-94 V-0 grade during vertical burning tests and the limiting oxygen index value was 28.5% when 25 wt % PPAP/AlPi with the mass ratio of 4:1 was incorporated. The introduction of PPAP/AlPi improved the residual mass and thermal stability, and stimulated to produce the char layer with high quality. The formed char layer exerted shielding effect and AlPi could inhibit the flame in gas phase. Consequently, the PPAP/AlPi system evoked fire retardant effects in condensed and gas phase simultaneously, and the fire resistance of the TPE composites was enhanced. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020 , 137, 47711.     

NBR／PVC弹性体与输送带带芯的粘接性能

为提高输送带带芯与覆盖胶的粘接强度,研究了粘接温度、粘接时间和各组分用量对粘接性能的影响。结果表明：温度、时间、增塑剂和氢氧化铝的用量等对其拉伸剪切强度有较大影响。制备的覆盖胶与带芯粘接强度可达７．６ＭＰａ。     

动态硫化EPDM/PP共混型热塑性弹性体的研究

研究了ＥＰＤＭ／ＰＰ共混比、不同牌号ＰＰ、硫化体系、混炼方式和软化剂用量对动态硫化ＥＰＤＭ／ＰＰ共混物性能的影响。研究结果表明,当ＥＰＤＭ／ＰＰ共混比为６５／３５,经一步混炼法制出的共混物的拉伸强度大于８ＭＰａ,扯断伸长率达４００％,撕裂强度为４０ｋＮ·ｍ－１,屈挠寿命大于１０万次,邵尔Ａ型硬度为７０～８０度。软化剂用量在３０份以内为宜。     

Thermoplastic elastomers from rubber and recycled polyethylene: chemical reactions at interphases for property enhancement

Recycled low density polyethylene (R‐LDPE) has been reactively compatibilized with butadiene rubber (BR) by using small additions of reactive polyethylene copolymers and reactive BRs to produce thermoplastic elastomers (TPEs). TPEs were characterized by thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), dynamic mechanical analysis (DMA), rheology measurements, wide‐angle X‐ray scattering (WAXS) and mechanical testing. WAXS results show that the presence of BR and reactive modifiers does not completely prevent the crystallization of R‐LDPE during the TPE formation. Depression of the melting point has been found in all cases. Also in all cases, compatibility is provided by formation of interfacial layers. The best mechanical characteristics are obtained for R‐LDPE + BR blends compatibilized with poly(ethylene‐co‐acrylic acid) (PE‐co‐AA) and polybutadiene terminated with isocyanate groups (PB‐NCO) for PB‐NCO = 7.5 wt% per PB and COOH/NCO ratio = 1/1. The stress at break and elongation at break are respectively improved by 31 % and 63 %. The PB‐NCO modifier participates in co‐vulcanization with BR in the rubber phase and reacts at the interface with the PE‐co‐AA dissolved in the polyolefin phase. As a result, the amorphous phase of R‐LDPE is dissolved by the rubber phase and a morphology with dual phase continuity is formed, assuring an improvement of mechanical properties of TPEs. Copyright © 2004 Society of Chemical Industry     

热塑性弹性体的开发动向

热塑性弹性体（ＴＰＥ）已进入第四代发展时期。ＴＰＥ的开发动向表面在现存ＴＰＥ品种的改性、形成高性能ＴＰＥ合金、基体后交联、反应器合成和新的加工成型技术的开发等几个方面。ＴＰＥ向高性能化和高功能化方向发展。     

聚氨酯/聚(甲基丙烯酸甲酯-苯乙烯)-半互穿网络热塑性弹性体的结构与性能研究

通过TEM和DSC等手段分析了聚氨酯／聚(甲基丙烯酸甲酯-苯乙烯)-半互穿网络(IPN)热塑性弹性体PU／P(MMA-co-St)的微观结构和玻璃化转变温度。结果表明中PU仍为分散相或连续性较小的相，而P(MMA-co-St)则为连续相或较大连续相，网络的互穿主要发生在PU的硬段区。对材料物理机械性能的测试表明当PU／PMS组分比为60／40、单体比MMA／St为50／50左右时，制得的半IPN的力学性能最佳。     

The influence of compatibilizers on nitrile-butadiene rubber and polypropylene (NBR/PP) blends

Four kinds of compatibilizers—chlorinated polyethylene (normal CPE), highly chlorinated CPE, maleic anhydride grafted with polypropylene (MP), and chlorinated polypropylene (CPP)—were used to study the influence of compatibilizing agents on the properties of nitrile-butadiene rubber and polypropylene (NBR/PP) blends, a kind of thermoplastic elastomer (TPE). The results show that the most proper amount of normal CPE, highly chlorinated CPE, MP, and CPP are 9, 8, 7, and 6 wt%, respectively, in the NBR/PP blends. The CPP was the best compatibilizer for NBR/PP blends among the four. NBR/PP blends obtained excellent properties of thermoplastic materials and can be molded with the general processing technologies for thermoplastics, such as injection, extrusion, blow molding, and the like. The mechanical properties are similar to that of Geolast, produced by Monsanto Company, and exceed the Chinese national criterion (GB7527-87). The tensile strength was 13.8 MPa; the elongation at break was 290%; and the compression set was 32%. After the blends were immersed in oil for 70 h, the tensile strength was 10.4 MPa, and the degree of oil absorption was 12%. The compatibility of the blends was consistent with the morphology from transmission electron microscopy (TEM).     

国外聚丙烯基热塑性弹性体的发展

以聚丙烯/三元乙丙橡胶型(PP/EPDM)热塑性弹性体(TPE)为例,介绍国外进行聚丙烯基TPE的研制、生产、应用和发展状况,指出了这类热塑性弹性体的发展方向。     

乘用车密封条的技术现状及发展趋势

简介乘用车密封条生产技术的现状和发展趋势以及乘用车橡胶密封条所用原材料和骨架材料的产品种类与性能.即用于乘用车车身密封系统的三元乙丙橡胶(EPDM)密封条和热塑性弹性体(TPE),指出高新技术材料与普通材料复合在乘用车车身密封系统已经开始得到广泛的应用.