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首页> 外文期刊>Journal of Applied Polymer Science >The effect of the architecture and concentration of styrene-butadiene compatibilizers on the morphology of polystyrene/low-density polyethylene blends
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The effect of the architecture and concentration of styrene-butadiene compatibilizers on the morphology of polystyrene/low-density polyethylene blends

机译：苯乙烯-丁二烯增容剂的结构和浓度对聚苯乙烯/低密度聚乙烯共混物形态的影响

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摘要

The effect of styrene-butadiene block copolymers (SB) witli varying number of blocks and length of styrene blocks on the morphology, rheology, and impact strength of 4/1 polystyrene/ low-density polyethylene (PS/ LDPE) blends was studied. The scanning and transmission electron microscopy and X-ray scattering were used for determination of the size of LDPE particles and the localization and structure of SB copolymers in blends. It is shown that the dependence of the LDPE particle size on the amount of added SB and localization of SB copolymers in blends is predominantly controlled by the length of their Styrene blocks. It follows from thermodynamic considerations that the reason is the difference in composition asymmetry between SB with short and long styrene blocks. Coalescence of particles of SB having short styrene blocks at the surface of LDPE droplets and movement of SB with long styrene blocks to the PS-LDPE interface were observed during annealing of PS/LDPE/SB blends. Pronounced migration of SB copolymer during annealing shows that their localizations in blends in steady state on long steady mixing and at thermodvnamic equilibrium are different. The values of tensile impact strength of PS/LDPE/SB blends correlate well with the size of LDPE particles and the amount of SB at the interface. Viscosity of BS/LDPE/SB depends on molecular structure of SB copolymers by a manner different from that of tensile impact strength. The results of this Study and literature data lead to the conclusion that the compatibilization efficiency of SB copolymers for a certain polystyrenepolyolefin pair is a function of not only molecular parameters of SB but also of the polystyrene/polyolefin ratio, the amount of SB in a blend, and mixing and processing conditions. (c) 2006 Wiley Periodicals, Inc.
机译：研究了不同嵌段数和苯乙烯嵌段长度的苯乙烯-丁二烯嵌段共聚物（SB）对4/1聚苯乙烯/低密度聚乙烯（PS / LDPE）共混物的形态，流变性和冲击强度的影响。扫描和透射电子显微镜以及X射线散射用于测定LDPE颗粒的尺寸以及共混物中SB共聚物的定位和结构。结果表明，LDPE粒度对共混物中SB添加量和SB共聚物局部化的影响主要受其苯乙烯嵌段长度的控制。从热力学的观点出发，其原因是具有短和长苯乙烯嵌段的SB之间的组成不对称性的差异。在PS / LDPE / SB共混物的退火过程中，观察到在LDPE液滴表面上具有短苯乙烯嵌段的SB颗粒的聚结以及具有长苯乙烯嵌段的SB向PS-LDPE界面的移动。 SB共聚物在退火过程中的明显迁移表明，它们在长期稳定混合和热力学平衡的稳态共混物中的定位不同。 PS / LDPE / SB共混物的拉伸冲击强度值与LDPE颗粒的大小和界面处的SB量密切相关。 BS / LDPE / SB的粘度以与拉伸冲击强度不同的方式取决于SB共聚物的分子结构。该研究和文献数据的结果得出结论：SB共聚物对某些聚苯乙烯-聚烯烃对的增容效率不仅取决于SB的分子参数，而且还取决于聚苯乙烯/聚烯烃比，共混物中SB的量。 ，以及混合和加工条件。 （c）2006年Wiley Periodicals，Inc.

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