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首页> 外文期刊>Journal of Applied Polymer Science >Rheological properties of polystyrene blends with rigid ladderlike polyphenylsilsesquioxane
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Rheological properties of polystyrene blends with rigid ladderlike polyphenylsilsesquioxane

机译：刚性梯形聚苯基倍半硅氧烷的聚苯乙烯共混物的流变性能

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Polystyrene (PS) blends with rigid ladderlike polyphenylsilsesquioxane (PPSQ) were prepared by solution casting followed by hot pressing. The rheological properties of these blends were studied under dynamic shear and uniaxial elongation conditions. The loss modulus (G") and dynamic shear viscosity (eta*) of the 95/5 PP/PPSQ blend were slightly lower than those of pure PS at low frequencies (<= 10(-2) rad/s). However, the storage modulus (G'), G", and eta* of the other blends (90/10, 85/15, and 80/20) were higher than those of pure PS and increased with PPSQ content. The eta(E) data demonstrated that PS/PPSQ blends exhibited slightly weaker (5% PPSQ) or much weaker (10% PPSQ) strain hardening than PS. In contrast, the 85/15 and 80/20 PP/PPSQ blends showed strain softening, and the extent of strain softening increased with PPSQ content. PS entanglements might have been reduced by the specific interactions between PS and PPSQ, which locally ordered some PS molecules in the 95/5 blend sample, because most of the PPSQ might have been well dispersed in the PS continuous phase, and only a few small PPSQ particles (similar to 1.3 mu m) were formed because of good miscibility. However, at high PPSQ contents (>= 10%), many larger hard PPSQ particles were formed, which acted as fillers during, the rheological measurements. (c) 2005 Wiley Periodicals, Inc.
机译：聚苯乙烯（PS）与刚性梯形聚苯基倍半硅氧烷（PPSQ）的共混物是通过溶液浇铸，然后热压制备的。在动态剪切和单轴伸长条件下研究了这些共混物的流变性能。 95/5 PP / PPSQ共混物的损耗模量（G“）和动态剪切粘度（eta *）在低频下（<= 10（-2）rad / s）略低于纯PS。其他共混物（90 / 10、85 / 15和80/20）的储能模量（G'），G“和eta *均高于纯PS，并随PPSQ含量的增加而增加。 eta（E）数据表明，PS / PPSQ共混物的应变硬化性比PS略弱（5％PPSQ）或弱得多（10％PPSQ）。相反，85/15和80/20 PP / PPSQ共混物显示出应变软化，且应变软化程度随PPSQ含量的增加而增加。 PS和PPSQ之间的特定相互作用可能减少了PS的纠缠，后者在95/5共混样品中局部排列了一些PS分子，因为大多数PPSQ可能已经很好地分散在PS连续相中，只有少量由于良好的混溶性，形成了PPSQ颗粒（约1.3微米）。但是，在高PPSQ含量（> = 10％）下，会形成许多较大的硬PPSQ颗粒，这些颗粒在流变测量过程中充当填充剂。 （c）2005年Wiley Periodicals，Inc.

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