توجه: محتویات این صفحه به صورت خودکار پردازش شده و مقاله‌های نویسندگانی با تشابه اسمی، همگی در بخش یکسان نمایش داده می‌شوند.
۱Effect of Organoclay and SEBS–g–MA Contents on Constituting Balance between Stiffness vs. Toughness in PP\SEBS–g–MA\Organoclay Nanocomposites
نویسنده(ها): ، ،
اطلاعات انتشار: سومین کنفرانس نانوساختارها، سال
تعداد صفحات: ۵
The effect of Maleated Styrene\Ethylene–Butylene\Styrene (SEBS–g–MA) and organoclay contents on the constituting balance between stiffness\strength versus toughness\ductility by melt blending with Polypropylene (PP) in an internal mixer has been investigated. In this direction, 9 different formulations varying in montmorillonite (MMT) and SEBS–g–MA contents were made. X–ray diffraction (XRD) and transmission electron microscopy (TEM) were used to evaluate the effects of the Org–MMT and SEBS–g–MA additions on the structure of nanocomposites. XRD traces showed that the characteristic (001) peak of the nanocomposites shifted to the lower angle region. On the other hand, XRD and TEM results showed simultaneous existence exfoliated and intercalated structure in produced nanocomposites. The tensile properties and impact strength are discussed in terms of the MMT and rubber contents and morphology. Adding of nanoclay enhanced the stiffness properties (modulus and strength) but reduced their toughness properties (impact strength). On the other hand, adding of SEBS–g–MA reduced stiffness but increase toughness properties. Also, SEM micrographs considered in this project. As a main result, we gain access a best, optimum composition that which, there is a clear trade–off between stiffness\strength versus toughness\ductility, in this work.<\div>

۲The evaluation and optimization of Impact Strength of PP\PC\SEBS Ternary Blends by Using Taguchi Methodology
نویسنده(ها): ، ، ،
اطلاعات انتشار: کنفرانس بین المللی فرآورش پلیمرها، سال
تعداد صفحات: ۴
The paper deals with polypropylene (PP)\poly (styrene–b–(ethylene–co butylene)–b–styrene) tri–block copolymer (SEBS)\polycarbonate (PC) ternary blends in which, the impact strength is studied using L9 nominal Taguchi methodology. First of all, nine samples are produced at different processing conditions within a twin screw extruder, in accord with L9 design. Three nominal processing parameters were die temperature, screw speed, and order of mixing which were changed based on L9 Taguchi experimental design; then, the impact strength of the produced samples was considered as the responding variable. By analyzing the impact data regarding with either mean or interactive effects by using Taguchi analysis, it is observed that the impact strength of the PP\SEBS\PC ternary blends is not affected by die temperature significantly, whereas screw speed and blending sequence showed major contribution on it. Consequently, the best sample regarding to highest impact strength toward such ternary systems, was identified optimization of experimental data, on the basis of L9 methodology.<\div>

۳Reactive Compatibilization of Polyamide–6\Polycarbonate Blends by using Maleated SEBS
اطلاعات انتشار: کنفرانس بین المللی فرآورش پلیمرها، سال
تعداد صفحات: ۴
The work deals with compatibilization of polyamide–6 (PA–6)\polycarbonate (PC) systems by using maleated poly [styrene–b–(ethylene–co–butylene)–b–styrene] triblock copolymer (SEBSg– MA). In particular, the interset was to study the role of such compatibilizer toward morphology and mechanical properties of the incompatible polymer blends of PA–6\PC. Here, incorporation of reactive SEBS–g–MA and unfunctionalized SEBS, namely reactive compatibizing system, has been found to provide significant improvement toward mechanical properties of the PA–6\PC blends. In addition, scanning electron microscopy (SEM) studies showed that the encapsulation of SEBS around the PC domains becomes gradually incomplete while using SEBS–g–MA and unfunctionalized SEBS, simultaneously, throughout the PA–6 rich phase. Also, the SEBS dispersed domains within the PA–6 matrix progressed with increasing the ratio of unfunctionalized SEBS to SEBS–g–MA. However the encapsulation was incomplete, maximum impact strength and maximum strain at break in tensile test were achieved when certain weight ratio of SEBS–g–MA to SEBS were employed.<\div>

۴SEBS–g–MAH compatibilizer precursor for PP\PC\SEBS Ternary Systems
نویسنده(ها): ، ، ،
اطلاعات انتشار: کنفرانس بین المللی فرآورش پلیمرها، سال
تعداد صفحات: ۴
This paper presents the effect of maleated SEBS compatibilizer precursor on the morphology and mechanical properties toward polypropylene (PP)\polycarbonate (PC)\ poly (styrene–b– (ethylene–co–butylene)–b–styrene) (SEBS) 70\15\15 w\w\w ternary systems. Two disperse phases are consisting of 15wt% of PC and 15 wt% of reactive (maleic anhydride grafted) and non reactive SEBS mixtures which are prepared in a co–rotating twin screw extruder. Scanning electron micrographs prepared by morphological study showed that the blends containing only non–reactive SEBS exhibited a fine dispersion of core–shell particles. In rest of samples, all including reactive compatibilizer precursor, by decreasing the SEBS \ SEBS–g–MAH weight ratio, the blend morphology changed from the core–shell particles to a complex system containing composite droplets, rod like structures and individual particles. In fact, the mechanical properties were considerably affected by variations in the phase morphology which could be attributed to the formation of those especial microstructures revealed by the morphological characterizations<\div>
نمایش نتایج ۱ تا ۴ از میان ۴ نتیجه