Polypropylene (PP)/hydrogenated styrene-isoprene-styrene block copolymer (HYBRAR) blends were proposed as a new material for the fabrication of micro-pyramids via the micro hot embossing of their blend thin-films. As a typical thermoplastic amorphous polymer, HYBRAR could promote the crystallinity and decrease the crystallization temperature of PP. With increasing HYBRAR proportion, mechanical behavior of PP/HYBRAR blends changed from a typical plastic to a typical elastomer. HYBRAR exhibited higher complex viscosity and much higher storage modulus dependence on shearing frequency than PP, which is attributed to the strong interaction between polystyrene segments on HYBRAR. Measurement of micro-pyramids by a laser scanning microscope indicated the embossing temperature and HYBRAR proportion in the blends were the two key factors determining the integrity of micro-pyramids. With higher deformation ability than PP, HYBRAR could effectively promote the moldability of PP/HYBRAR blends in the micro hot embossing, leading to a better integrity of micro-pyramids and low haze and high light transmittance of the embossed thin-films. In addition, the effects of T_m of PP and the thickness of the film base on the optical properties of embossed PP/HYBRAR blend thin-films were also discussed. PP/HYBRAR blends are proved to possess a promising prospect in the fabrication of optical thin-films.

中文翻译：

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聚丙烯/氢化苯乙烯-异戊二烯-苯乙烯嵌段共聚物共混物的表征和通过共混薄膜的微热压花制备微金字塔†

聚丙烯（PP）/氢化苯乙烯-异戊二烯-苯乙烯嵌段共聚物（HYBRAR）的共混物被提议作为一种新的材料，可通过混合薄膜的微热压花。作为一种典型的热塑性无定形聚合物，HYBRAR可以提高PP的结晶度并降低其结晶温度。随着HYBRAR比例的增加，PP / HYBRAR共混物的机械性能从典型的塑料变为典型的弹性体。与聚丙烯相比，HYBRAR表现出更高的复数粘度和更高的储能模量对剪切频率的依赖性，这归因于HYBRAR上的聚苯乙烯链段之间的强相互作用。用激光扫描显微镜对微金字塔进行测量表明，共混物中的压花温度和HYBRAR比例是决定微金字塔完整性的两个关键因素。具有比PP高的变形能力，HYBRAR可以在微热压花过程中有效地提高PP / HYBRAR混合物的可模塑性，从而使微金字塔的完整性更好，并且压花薄膜的雾度和透光率高。另外，效果还讨论了PP的T _m和基于压纹PP / HYBRAR共混薄膜的光学性能的薄膜厚度。事实证明，PP / HYBRAR共混物在光学薄膜的制造中具有广阔的前景。