动态硫化制备粉末丁苯橡胶/聚丙烯合金的研究

采用双螺杆动态硫化工艺,用粉末丁苯橡胶(PSBR)改性聚丙烯(PP)制备了PSBR/PP共混物,考察了二者的质量比、软化剂、补强剂和加工工艺对共混物性能的影响,并对体系的耐老化性能进行了初步研究。结果表明,当PSBR与PP质量比为12/88时,使用软化剂可提高共混物的加工流动性;纳米高岭土对共混物有较明显的增强作用;用动态硫化工艺制得共混物的性能优于非动态硫化工艺制得的共混物。     

PSBR/PP高聚物合金的性能研究

通过双螺杆挤出机,采用动态硫化法制备了粉末丁苯橡胶/聚丙烯(PSBR/PP)高聚物合金,研究了不同橡塑比、填料和软化剂用量、加工工艺对共混物力学性能的影响。     

BR/EVA/HIPS TPV的制备和性能研究

采用苯乙烯-丁二烯-苯乙烯嵌段共聚物(SBS)改善BR/乙烯-乙酸乙烯酯共聚物(EVA)/高抗冲聚苯乙烯(HIPS)共混物的界面相容性,通过动态硫化法制备BR/EVA/HIPS TPV,并对其性能进行研究.结果表明:未加入SBS的BR/EVA/HIPS共混物未表现出橡胶类弹性体特征,而加入适量SBS的共混物表现出典型橡胶类弹性体特征;当SBS用量为8～12份时,BR/EVA/HIPS TPV的综合物理性能较好,拉伸断面平滑,界面相容性良好.     

动态硫化EPDM/PP热塑性弹性体制备工艺研究

研究了不同硫化体系 ,硫化时间 ,硫化剂的用量 ,共混温度 ,橡塑比 ,填充炭黑和软化剂的用量对动态硫化 EPDM/ PP共混物性能的影响。研究结果表明 :酚醛硫化体系制得的 EPDM/ PP共混物加工性能和力学性较佳 ,硫化时间在 10～ 15 min,硫化剂的用量以完全交联 EPDM为宜 ,共混温度控制在 170℃～ 190℃ ,橡塑比 70 / 3 0～ 5 0 / 5 0 ,填充炭黑在 40份以内 ,软化剂在 2 0份以内较为理想     

粉末丁苯橡胶改性聚乙烯动态硫化性能的研究

介绍了粉末丁苯橡胶改性聚乙烯的动态硫化性能,采用开炼工艺和双螺杆工艺考察了不同m(PSBR)/m(PE)的动态硫化体系,并考察了硫化体系、软化剂组分、补强剂组分对改性后聚乙烯力学性能的影响。结果表明:m(PSBR)/m(PE)在60/40~40/60范围内为宜;通过采用双螺杆动态硫化工艺,采用半有效硫化体系可以制备出综合性能优异的TPO专用物料,其硫化体系组分以0.8份为宜,软化剂2~6份为宜,补强体系以白炭黑补强效果最佳,且6～15份为宜。     

动态硫化PSBR/PE共混型热塑性弹性体的研究

采用动态硫化法制备了粉末丁苯橡胶（PSBR）／聚乙烯（PE）共混型热塑性弹性体（TPO），研究了共混比、硫化体系、填料种类及用量、加工工艺对共混胶力学性能的影响。结果表明，当PSBR／PE共混比为60／40并采用传统硫化体系、白炭黑作补强剂时，TPO综合性能较好。     

PP/EVA共混物的动态硫化研究

研究了动态硫化对聚丙烯/乙烯-醋酸乙烯酯共聚物(PP/EVA)共混物的性能和结构的影响。结果表明:动态硫化使PP/EVA共混物的力学性能(尤其是韧性)获得显著提高;通过对交联剂BIPB用量和助硫化剂S用量的合理控制可制得综合性能优异的PP/EVA动态硫化共混物;动态硫化可细化分散于PP基体中的EVA颗粒粒径,改善EVA的分散效果。最终制得的抗冲PP料主要性能均达到或超过国外同类产品水平。     

SBR/HIPS TPV的制备及性能研究

采用动态硫化法制备SBR/高抗冲聚苯乙烯(HIPS)热塑性硫化胶(TPV),并对其性能进行研究.结果表明,当SBR/HIPS共混比大于60/40时,SBR/HIPS TPV呈现出典型的弹性体应力-应变行为;当SBR/HIPS共混比为60/40～70/30时,SBR/HIPS TPV的硬度适中,综合物理性能良好.扫描电子显微镜分析表明,SBR以带状形貌均匀分散在HPS基体中,两相界面结合良好.     

四溴双酚A对HIPS共混材料阻燃及增韧性能影响的研究

采用四溴双酚A(TBBA)为阻燃剂对高抗冲聚苯乙烯(HIPS)共混材料进行阻燃改性;研究了TBBA的阻燃机理、TBBA含量、TBBA与三氧化二锑(Sb2O3)的协同效应及其对HIPS共混材料阻燃性能、力学性能和加工性能的影响。结果发现,当TBBA/Sb2O3的协同质量比为3∶1时,共混体系的阻燃效果最好;并比较了增韧剂种类和用量对HIPS共混材料阻燃性能、力学性能和加工性能的影响。     

共混型热塑性弹性体的研究 Ⅳ.制取再生胶/聚乙烯热塑性弹性体的研究

本工作用胎面再生胶与聚乙烯树脂共混制取热塑性弹性体,研究了共混工艺、交联体系、橡塑比、树脂种类、软化剂等对共混体物理机械性能的影响。结果表明,采用中温制母胶工艺、S/DCP并用硫化体系、用LLDPE与HDPE并用树脂组分可制得物理机械性能较好的聚烯烃型热塑性弹性体(TPO)。本材料可以顺利地挤出成型。还用透射电镜研究了共混体的形态结构。     

The effects of blending small amounts of homopolystyrene on the mechanical properties of a low styrene content styrene-butadiene-styrene block copolymer

Tensile, cyclic, and tear properties were compared for several styrene-butadiene-styrene (SBS) triblock copolymers, KRATON D2104, D1101 and D1102, and blends of D2104 with monodisperse polystyrene of various molecular weights. D2104 is expected to have a morphology of polystyrene spheres in a polybutadiene continuous matrix. The mechanical properties of D2104 were compared to the properties of SBS materials which have higher styrene contents and exhibit cylindrical or lamellar morphologies. Blending the D2104 with polystyrene (molecular weights ranging from 2000 to 51,000) to 24 and 28 wt % total styrene content showed that the tensile strength obtained for a blend was dependent on the molecular weight of the polystyrene added. Cycle testing of the D2104-polystyrene blends showed that with increasing polystyrene content the softening effect increases with increasing strain. This indicates that the degree of phase continuity of the polystyrene domains may be changing from a spherical morphology to a cylindrical morphology similar to that of pure SBS with 28 wt % styrene content. Tear test results for the blends were also observed to be similar to the results for pure SBS of the same total polystyrene content.     

共混型聚丙烯/超细粉末丁苯橡胶全硫化热塑性弹性体的制备及其结构与性能

以全硫化超细粉末丁苯橡胶(PSBR)与聚丙烯(PP)为原料,采用双螺杆挤出机共混方法制备PP/PSBR全硫化热塑性弹性体。通过透射电镜观测,发现PP/PSBR全硫化热塑性弹性体具有和动态硫化方法制备的热塑性弹性体相似的微观形态,PSBR粒子作为分散相分散在连续相PP中;所制备的热塑性弹性体的力学性能与PP的相对分子质量、共聚与否、PSBR含量及其交联度有关;通过流变行为研究,发现此类全硫化热塑性弹性体为假塑性流体,且橡胶的含量对热塑性弹性体的黏度影响很小;采用差示扫描量热法对PP/PSBR全硫化热塑性弹性体中连续相PP的结晶行为进行了研究,发现连续相PP的结晶温度提高,表明PSBR对PP有异相成核作用。     

Reactive extrusion of polystyrene/polyethylene blends

The feasibility of inducing beneficial changes to polystyrene/polyethylene (PS/PE) blends via reactive extrusion processes is considered. Experiments have been conducted on 50:50 wt.% PS/PE blends that were treated with different levels of dicumyl peroxide and triallyl isocyanurate coupling agent. Both a low molecular weight and a high molecular weight blend series have been investigated. A “more reactive” polystyrene was synthesized by incorporation of a minor amount of ortho-vinylbenzaldehyde. Blends containing this modified polystyrene were subjected to identical processing' conditions on a counter-rotating twin screw extruder. Examination of the tensile properties of the extrusion products suggested that a judicious level of peroxide and coupling agent additives would be beneficial to the ultimate physical properties. The quantity of styrenic phase becoming chemically grafted to the polyethylene matrix was influenced most strongly by the level of the chosen coupling agent. As determined by scanning electron microscopy, the phase morphologies of the tensile test fracture surfaces were strongly dependent upon the reaction extrusion process; those extruded blends that had been exposed to the additive pre-treatment displayed substantially finer microstructure. The enthalpy of fusion of the polyethylene melting endotherm was likewise influenced by both the presence or absence of the additives as well as the molecular weight nature of the blend series.     

Polycarbonate-polystyrene block copolymers and their application as compatibilzing agents in polymer blends

The synthesis of a block copolymer with polystyrene (PS) and polycarbonate (PC) segments is described. It is produced by anionic polymerization of the styrene and endcapping with a hydroxyl group followed by subsequent reaction with phosgene and bisphenol-A. The polystyrene/polycarbonate block copolymer was used as a compatibilizing agent for blends of poly(ethylene terephthalate) (PET) and poly(p- phenylene oxide) (PPO). The block copolymer reduced the dimensions of the dispersed phase. The uniaxial mechanical properties of the compatibilized blends were improved by 5 to 10 wt% loadings of the copolymer.     

PVC/环氧树脂E51共混物性能的研究

以504及554/504分别作为固化剂,采用锥形双螺杆挤出机实现了PVC与环氧树脂的熔融共混,制备了PVC/环氧树脂E51共混物。固化剂用量为环氧树脂E51用量的80%时,研究了环氧树脂E51用量、固化剂组成及固化时间对PVC/环氧树脂E51共混物力学性能及维卡软化温度的影响。结果表明:以504及554/504为固化剂,少量环氧树脂E51(4份以内)加入PVC后,有助于提高共混物的拉伸强度、弯曲强度;当环氧树脂E51为2份、固化时间为8h时,共混物维卡软化温度达到最大值100.2℃,比纯PVC高出16.5℃。     

Influence of the extrusion process on the morphology and micromechanical behavior of polystyrene‐block‐(polystyrene‐co‐butadiene)‐block‐polystyrene star block copolymer/homopolystyrene blends

The influence of the extrusion process on the morphology and micromechanical behavior of an asymmetric polystyrene‐block‐(polystyrene‐co‐butadiene)‐block‐polystyrene (SBS) star block copolymer and its blends with general‐purpose homopolystyrene (hPS) was studied with films prepared with a single‐screw extruder. The techniques used were transmission electron microscopy and uniaxial tensile testing. Unlike the pure SBS block copolymer possessing a gyroid‐like morphology, whose deformation was found to be insensitive to the processing conditions, the mechanical properties of the blends strongly depended on the extrusion temperature as well as the apparent shear rate. The deformation micromechanism was primarily dictated by the blend morphology. The yielding and cavitation of the nanostructures were the principal deformation mechanism for the blends having a droplet‐like microphase‐separated morphology, whereas cavitation dominated for the blends containing macrophase‐separated layers of polystyrene. The mechanical properties of the blends were further examined with respect to the influence of the temperature and shear rate on the phase behavior of the blends. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci, 2007     

影响ACM／FKM硫化胶耐热老化性能的配方因素

研究了共混比、炭黑品种及用量、软化剂和防老剂种类等配方因素对丙烯酸酯橡胶（ACM）／氟橡胶（FKM）硫化胶耐热老化性能的影响。结果表明,经180℃×48h热老化后,ACM／FKM硫化胶的力学性能保持率随ACM用量的增加而降低;加入0～50质量份炭黑补强的硫化胶耐热老化性能随炭黑用量增加而提高;使用软化剂硅油的硫化胶的耐热老化性能较好;添加防老剂可提高共混硫化胶的耐热老化性能,其中防老剂RD和A效果较好。     

影响氯磺化聚乙烯/丁腈橡胶共混物耐热老化性能的因素

研究了氯磺化聚乙烯(CSM)和丁腈橡胶(NBR)的共混比、硫黄用量、炭黑、防老剂及软化剂诸因素对CSM/NBR共混物耐热老化性能的影响。结果表明,将CSM与NBR共混,可以改善NBR的耐热老化性能,当CSM/NBR共混比(质量比)为50/50时,耐热老化性能得到显著提高。适当减少硫黄用量,有利于保持较高的耐热老化性能,硫黄用量以0.25~0.75份为宜。炭黑用量对共混物的耐热老化性能有影响,随着炭黑N 550用量的增加,老化后的力学性能保持率先增加后减小。防老剂NBC的耐热老化效果较好。软化剂选用邻苯二甲酸二丁酯或邻苯二甲酸二辛酯时,CSM/NBR共混物具有较好的耐热老化性能。     

Processing and morphology of polystyrene/ethylene-propylene rubber reactive and nonreactive blends

The difference between reactive and nonreactive polymer blends in terms of processing and morphology has been investigated. The glassy phases for the blends are an oxazoline functional polystyrene (PS-Ox) and a similar non-functional polystyrene (PS). The rubbery phases are an ethylene-propylene rubber (EP) and a similar ethylene-propylene rubber (EP-MA) with 07% grafted maleic anhydride. In the case of PS-Ox/EP-MA blends, the oxazoline group may react with the grafted rubber functionality at the interface between the two immiscible components during blending to form a compatibilizing agent in-situ. The nonreactive blends systems of PS-Ox/EP and PS/EP-MA were used for comparison to the reactive system. The blend components are rheologically matched to simplify the interpretation of the process and morphological data. The blends were prepared in a batch mixer with roller blades. The torque required for mixing was measured during the blending process. The torque traces for the reactive blends exhibited a peak in torque, attributed to the chemical reaction at the interface. The weight fraction of gel in the blends was used to measure the extent of reaction. It correlates well with the mixing torques and rheological properties. The nonreactive PS-Ox/EP and PS/EP-MA blends show poor interfacial adhesion between the two phases. In contrast, the reactive PS-Ox/EP-MA blends show excellent during annealing is also much greater for the reactive blends. Varying the functionality concentration in the PS phase shows that the dispersed phase rubber particle size is reduced by increasing the concentration of oxazoline in the matrix. Blends with no or small amounts of functionality in the PS phase exhibit yield behavior in tension. However, a level of concentration of reactive functionality may be reached where the material becomes brittle.