Structure and properties of polypropylene/low-density polyethylene blends grafted with itaconic acid in the course of reactive extrusion

被引：0
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作者：
Krivoguz, Y.M. [1 ]
Pesetskii, S.S. [1 ]
Jurkowski, B. [2 ]
Tomczyk, T. [2 ]
机构：
[1] Laboratory of Chemical Technology of Polymeric Composite Materials, V. A. Belyi Metal-Polymer Research Institute, National Academy of Sciences of Belarus, 32a Kirov Street, Gomel, 246050, Belarus
[2] Division of Plastic and Rubber Processing, Institute of Material Technology, Poznan University of Technology, 60-965 Poznan, Poland
来源：
Journal of Applied Polymer Science | 2006年 / 102卷 / 02期
关键词：
This study was concerned with the structural features and mechanical properties of polypropylene (PP)/ low-density polyethylene (LDPE) blends; which after compounding were modified by the free-radical grafting of itaconic acid (IA) to produce [PP/LDPE]-g-IA in the course of reactive extrusion. To analyze the structural features of the [PP/LDPE]g-IA systems; differential scanning calorimetry and relaxation spectrometry techniques were used. The data were indicative of the incompatibility of PP and LDPE in the [PP/LDPE]-gIA systems on the level of crystalline phases; however; favorable interactions were observed within the amorphous phases of the polymers. Because of these interactions; the crystallization temperature of PP increased by 5-11°C; and that of LDPE increased by 1.3-2.7°C. The rapprochement of their glass-transition temperatures was observed. The single β-relaxation peak for the [PP/LDPE]-g-IA systems showed that compatibility on the level of structural units was responsible for β relaxation in the homopolymers used. Variations in the ratios of the polymers in the [PP/LDPE]-g-IA systems led to both nonadditive and complex changes in the viscoelastic properties as well as mechanical characteristics for the composites. Additions of up to 5 wt % PP strengthened the [PP/LDPE]-g-IA blended systems between the glass-transition temperatures of LDPE and PP. © 2006 Wiley Periodicals; Inc;
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页码：1746 / 1754
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