The influence of hydrogen bonding on the preparation and mechanical properties of PS‐diblock copolymer blends
The influence of hydrogen bonding on the preparation and mechanical properties of PS‐diblock copolymer blends
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DOI：
10.1002/polb.20094
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发表时间：
2004-06
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影响因子：
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通讯作者：
Van Casteren;van Ram Trier;Jgp Han Goossens;H. H. Meijer-H.;Pj Piet Lemstra
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文献类型：
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作者：
Van Casteren;van Ram Trier;Jgp Han Goossens;H. H. Meijer-H.;Pj Piet Lemstra
本文介绍了纳米核壳粒子在聚苯乙烯（PS）中诱导延展性的制备方法。采用FTIR光谱、固态NMR光谱和DSC研究了PS和聚（丙烯酸丁酯）-b-聚烯烃二嵌段共聚物在共混物中的溶解程度，其中PS通过与0.5-5 mol %的对-（六氟-2-羟基异丙基）苯乙烯（HFS）共聚而进行化学改性。聚丙烯酸丁酯的羟基和羰基之间的氢键作用增强了聚烯烃颗粒的相容性，并导致无规分布的聚烯烃颗粒被均匀的PBA/PS基体所包围。形态学参数，如分散相的大小或组分之间的相互渗透程度，可以简单地通过改变共混物中相互作用基团的量来控制。研究了共混物的力学性能。通过压缩试验研究了材料的内在变形行为，通过时间分辨小角X射线散射研究了材料的微观变形模式。结果表明，宏观断裂应变在很大程度上取决于二嵌段共聚物的含量和橡胶壳和PS基体之间的分层程度。观察到脆性行为的PS共混物，包含超过3摩尔%的HFS和PS基体和丙烯酸酯壳之间的显示出完全的相容性。对于显示部分相容性的共混物，压缩试验表明随着二嵌段共聚物浓度的增加，应变软化显著降低。此外，它表明，依赖于分层的程度的微观变形模式从银纹化的空化诱导剪切屈服的变化。© 2004 Wiley Periodicals，Inc.聚合物科学杂志B部分：聚合物物理42：2137-2160，2004
In this article, the preparation of nanosized core-shell particles to induce ductility in polystyrene (PS) is described. FTIR spectroscopy, solid-state NMR spectroscopy, and DSC were used to examine the extent of miscibility of PS and poly(butylacrylate)-b-polyolefin diblock copolymers in a blend in which PS was chemically modified by copolymerization with 0.5–5 mol % of p-(hexafluoro-2-hydroxy isopropyl) styrene (HFS). Hydrogen bonding between the hydroxyl-groups and the carbonyl-groups of polybutylacrylate enhanced the miscibility and lead to randomly distributed polyolefin particles surrounded by a homogeneous PBA/PS matrix. Morphological parameters such as the size of the dispersed phase or extent of interpenetration between the components are controllable simply by changing the amount of interacting groups in the blend. The mechanical properties of the prepared blends were also studied. The intrinsic deformation behavior was investigated by compression tests, whereas the microscopic mode of deformation was studied by time-resolved small-angle X-ray scattering. It was shown that the macroscopic strain at break depends to a large extent on the diblock copolymer content and the degree of demixing between the rubber shell and PS matrix. Brittle behavior was observed for PS blends that contain more than 3 mol % HFS and show complete miscibility between the PS matrix and acrylate shell. For the blends showing partial miscibility, the compression tests demonstrated a pronounced decrease in strain softening with increasing diblock copolymer concentration. Furthermore, it was illustrated that dependent on the degree of demixing the microscopic deformation mode changes from crazing to cavitation induced shear yielding. © 2004 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 42: 2137–2160, 2004