The effect of processing conditions on the mechanical properties and thermal stability of highly oriented PP tapes

被引：59
作者：
Alcock, B. [1 ]
Cabrera, N. O. [1 ,2 ]
Barkoula, N. M. [1 ,3 ]
Peijs, T. [1 ,2 ]
机构：
[1] Queen Mary Univ London, Sch Mat Sci & Engn, Ctr Mat Res, London E1 4NS, England
[2] Eindhoven Univ Technol, Eindhoven Polymer Labs, NL-5600 MB Eindhoven, Netherlands
[3] Univ Ioannina, GR-45110 Ioannina, Greece
来源：
EUROPEAN POLYMER JOURNAL | 2009年 / 45卷 / 10期
关键词：
Orientation; Fibres; Composites; Drawing; Self-reinforced; COMPOSITE POLY(METHYL METHACRYLATE); COEXTRUDED POLYPROPYLENE TAPES; STIMULATED SHRINKAGE FORCES; HIGH-MODULUS POLYETHYLENE; HOT-COMPACTION BEHAVIOR; ISOTACTIC POLYPROPYLENE; STRAIN-RATE; POSTDRAWING TEMPERATURE; CRYSTALLINE POLYMERS; INITIAL MORPHOLOGY;
D O I：
10.1016/j.eurpolymj.2009.06.025
中图分类号：
O63 [高分子化学（高聚物）];
学科分类号：
070305 ; 080501 ; 081704 ;
摘要：
It has previously been shown possible to use highly oriented polypropylene ( PP) tapes to create self-reinforced (all-PP) composites. It is desirable to understand the relationship between tape processing parameters and the mechanical properties and thermal stability of the tapes, as these tape properties will govern the ultimate properties of the all-PP composite. In this paper, the effects of the tape drawing parameters such as draw ratio (lambda), drawing temperature and thermal annealing on the final mechanical properties, density and dimensional thermal stability of the tapes are presented. PP tapes drawn to lambda = 17 possess tensile moduli of similar to 15 GPa and tensile strengths of similar to 450 MPa. PP tapes with high draw ratios, lambda > 9.3, show a decrease in density, a change from transparent to opaque appearance and increased dimensional thermal stability with increasing draw ratio. The results of an investigation into the effects of a thermal annealing step, targeted at improving the dimensional thermal stability of these highly oriented PP tapes, are also presented. (C) 2009 Elsevier Ltd. All rights reserved.
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页码：2878 / 2894
页数：17
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