Influence of Postdrawing Temperature on Mechanical Properties of Melt-Spun Isotactic Polypropylene

Schimanski, T Tilo; Peijs, Ton; Lemstra, Piet J.; Loos, Joachim

doi:10.1021/ma034949s

Cited by 32 publications

(41 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A lower drawing temperature results in a lower yield stress and a larger failure strain, as the drawing temperature determines the crystal structure variations during the drawing process. This has been investigated in detail by Schimanski et al [5]. Furthermore, annealing treatments have been shown to affect the thermal and mechanical properties of drawn PP tapes [20].…”

Section: Introductionmentioning

confidence: 99%

“…The drawing process enhances the molecular orientation of the PP, which improves the mechanical properties in the drawing direction [4,5]. These fibres or tapes are then woven in the preferred configuration [6][7][8] and compacted at elevated temperature and pressure into a self-reinforced sheet.…”

Section: Introductionmentioning

confidence: 99%

“…The properties of the oriented PP tapes before Composites Part A: Applied Science and Manufacturing 65 (2014) p. 100-107 DOI: 10.1016/j.compositesa.2014.06.003 compaction strongly depend on the conditions of the drawing process, whereas the properties of the PP matrix and thus the tape-to-tape and interlayer bonding in the compacted sheet depend on the conditions of the hot compaction process [5,6,12].…”

Section: Introductionmentioning

confidence: 99%

“…There is, however, a maximum attainable draw ratio, which is determined by the nature of the bonds and the chain extension in the polymer [19]. This maximum draw ratio depends on the molecular weight of the polymer [5,20]. The yield stress and the failure strain of the tapes depend on the drawing temperature.…”

Section: Introductionmentioning

confidence: 99%

“…The influence of the drawing process parameters on the mechanical properties of the PP tapes and the influence of the processing parameters on the mechanical properties of the final SRPP were extensively studied [4,5,[22][23][24]. However, these studies do not explain the impact behaviour of SRPP at low temperature.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Failure behaviour of self-reinforced polypropylene at and below room temperature

Swolfs

Fonteyne

Baets

et al. 2014

Composites Part A: Applied Science and Manufacturing

View full text Add to dashboard Cite

Self-reinforced polypropylene is a very tough material. It is even thought that its impact resistance increases with decreasing temperature. This was investigated by examining the constituent tapes and matrix. Tensile tests on both drawn polypropylene tapes and self-reinforced polypropylene were similar: the stiffness increased and the failure strain slightly decreased at low temperatures. The matrix, however, embrittled below room temperature due to the glass transition. In contrast with literature data on Izod impact resistance, the penetration impact resistance did not increase at low temperatures. At lower temperatures, the damaged area after non-penetration impact was significantly reduced. This was caused by a change in the damage mode from tape-matrix debonding to matrix cracking, as the matrix went through its glass transition. These conclusions provide the first understanding of the failure behaviour of self-reinforced polypropylene below room temperature, and can be exploited to further optimise the excellent impact resistance of self-reinforced polymers.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Failure behaviour of self-reinforced polypropylene at and below room temperature

Swolfs

Fonteyne

Baets

et al. 2014

Composites Part A: Applied Science and Manufacturing

View full text Add to dashboard Cite

show abstract

Preparation of High‐Performance Conductive Polymer Fibers through Morphological Control of Networks Formed by Nanofillers

Deng

Skipa

Bilotti

et al. 2010

Adv Funct Materials

Self Cite

125

View full text Add to dashboard Cite

A general method is described to prepare high‐performance conductive polymer fibers or tapes. In this method, bicomponent tapes/fibers containing two layers of conductive polymer composites (CPCs) filled with multiwall carbon nanotubes (MWNT) or carbon black (CB) based on a lower‐melting‐temperature polymer and an unfilled polymer core with higher melting temperature are fabricated by a melt‐based process. Morphological control of the conductive network formed by nanofillers is realized by solid‐state drawing and annealing. Information on the morphological and electrical change of the highly oriented conductive nanofiller network in CPC bicomponent tapes during relaxation, melting, and crystallization of the polymer matrix is reported for the first time. The conductivity of these polypropylene tapes can be as high as 275 S m−1 with tensile strengths of around 500 MPa. To the best of the authors' knowledge, it is the most conductive, high‐strength polymer fiber produced by melt‐processing reported in literature, despite the fact that only ∼5 wt.% of MWNTs are used in the outer layers of the tape and the overall MWNT content in the bicomponent tape can be much lower (typically ∼0.5 wt.%). Their applications could include sensing, smart textiles, electrodes for flexible solar cells, and electromagnetic interference (EMI) shielding. Furthermore, a modeling approach was used to study the relaxation process of highly oriented conductive networks formed by carbon nanofillers.

show abstract

Interfacial properties of highly oriented coextruded polypropylene tapes for the creation of recyclable all‐polypropylene composites

Alcock

Cabrera

Barkoula

et al. 2007

J of Applied Polymer Sci

View full text Add to dashboard Cite

The creation of highly oriented, coextruded polypropylene (PP) tapes allows the production of novel, wholly thermoplastic, recyclable ''all-polypropylene'' (all-PP) composites, which possess both a large temperature processing window (>308C) and a high volume fraction of reinforcement phase (highly oriented PP tapes: >90%). This large processing window is achieved by using coextruded, highly drawn PP tapes. To achieve coherent all-PP composites the interfacial characteristics following consolidation must be understood. This article investigates the interfacial characteristics of these coextruded tapes by using microcomposite models to create interfaces between tapes of varying draw ratios, drawing temperatures, skin/core ratios, and skin layer thicknesses. The tape drawing parameters are seen to control the interfacial properties in subsequent microcomposite models. The failure mode of these specimens, and hence bond strength, varies with consolidation temperature, and a model is proposed describing and explaining this behavior.

show abstract

Influence of Postdrawing Temperature on Mechanical Properties of Melt-Spun Isotactic Polypropylene

Cited by 32 publications

References 26 publications

Failure behaviour of self-reinforced polypropylene at and below room temperature

Failure behaviour of self-reinforced polypropylene at and below room temperature

Preparation of High‐Performance Conductive Polymer Fibers through Morphological Control of Networks Formed by Nanofillers

Interfacial properties of highly oriented coextruded polypropylene tapes for the creation of recyclable all‐polypropylene composites

Contact Info

Product

Resources

About