期刊
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
卷 83, 期 -, 页码 47-55出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.compositesa.2015.09.011
关键词
Mechanical properties; Polymer-matrix composites (PMCs); Recycling
资金
- Initiative for Sustainability and Energy at Northwestern University (ISEN), Northwestern University
- Northwestern University Terminal Year Fellowship
- NSF-MRSEC program at Northwestern University [DMR-1121262]
Solid-state shear pulverization (SSSP) is a continuous process that overcomes challenges in producing well-dispersed polymer composites that cannot be made by twin-screw melt extrusion. We use SSSP to produce 85/15 wt% polypropylene/waste paper biocomposites with polypropylene pellets and 2-cm-square waste paper pieces as starting material. Single-pass SSSP achieves effective filler size reduction and dispersion within the polypropylene matrix. We determine how waste paper size reduction and composite properties are functions of specific energy input and tune specific energy input by SSSP screw design and throughput. Composites made at moderate to high specific energy input (14-35 Wig) have 25 to nearly 50% of filler particles at sub-micron size; relative to neat polypropylene, composites exhibit a 70% increase in Young's modulus, retention of neat polypropylene yield strength, and a 50% reduction in crystallization half-time. Estimates indicate that the cost of such biocomposite materials made by SSSP is less than that of virgin polypropylene. (C) 2015 Elsevier Ltd. All rights reserved.
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