Crystalline properties and morphological changes in plastically deformed isotatic polypropylene evaluated by X-ray diffraction and transmission electron microscopy

Machado, Giovanna; Denardin, Elton Luís Gasparotto; Kinast, Éder Júlio; Gonçalves, Maria do Carmo; Luca, Maria Augusta De; Teixeira, Sérgio R.; Samios, Dimitrios

doi:10.1016/j.eurpolymj.2004.08.011

Cited by 77 publications

(34 citation statements)

References 44 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Beyond this compression ratio, pronounced changes in the morphology occur due to plastic flow as presented Machado et al by using X-ray diffraction and transmission electron microscopy (Machado et al, 2005).…”

Section: Stress-strain Behavior Under Plastic Deformationmentioning

confidence: 85%

Investigation of the large plastic deformation of iPP induced by plane strain compression: Stress–strain behavior and thermo-mechanical properties

Samios

Tokumoto

Denardin

2006

International Journal of Plasticity

View full text Add to dashboard Cite

Section: Stress-strain Behavior Under Plastic Deformationmentioning

confidence: 85%

Investigation of the large plastic deformation of iPP induced by plane strain compression: Stress–strain behavior and thermo-mechanical properties

Samios

Tokumoto

Denardin

2006

International Journal of Plasticity

View full text Add to dashboard Cite

“…This is due to the fibres are not fully (a) In addition, it can be observed that all the meltelectrospun fibres fabricated with the additives contain a-form crystals. The Bragg reflection peaks at 14°, 17°, 18.5°, 21°and 22°correspond to the monoclinic crystals of PP (a-form) with the indexed plane of (110), (040), (130), (111) and (041) [25,26] and a space group of P2 1 /c. In the fibre samples fabricated with the additives, the a-form crystals were predominant and no b-or c-form was found in any of the melt-electrospun fibres.…”

Section: Crystalline Propertiesmentioning

confidence: 98%

Melt-electrospinning of polypropylene with conductive additives

et al. 2012

View full text Add to dashboard Cite

In this paper, the feasibility of fabricating polypropylene (PP) nanofibres was investigated using conductive additives such as sodium oleate (SO) and sodium chloride (NaCl) during melt-electrospinning. PP of high melt flow index (MFI = 2000) was used with varying amounts of additives. The effects of amount of additives on the fibre diameter and morphology were investigated. The lowest fibre diameters of 0.371 ± 0.106 and 0.310 ± 0.102 lm were achieved with 7 % SO and 5 % NaCl, respectively. The fabrication of nanofibres was attributed to the increase in the electrical conductivity with the introduction of the additives. The increase in the electrical conductivity was greater in the case of NaCl, due to the smaller ionic size of NaCl. Differential scanning calorimetry results showed complex melting behaviour during the heating cycles for the fibres containing SO; and double melting peaks during the second heating cycle for the fibres containing NaCl. X-ray diffraction studies showed the fibres fabricated with the additives contained lower degrees of crystallinity compared to the as-spun fibre and the crystallinity was increased after annealing. The fibres fabricated with the additives contained a-form crystals only which did not change after annealing. The fibres fabricated from pure polymer and with the additives were hydrophobic in nature. The hydrophobicity was marginally decreased with the addition of SO and NaCl.

show abstract

“…As all ready presented in other papers, [17,21] the x-ray diffraction patterns have been fitted according to the two phase model which considers the semicrystalline system as composed by the amorphous and the crystalline phases. The results of the fitting procedures are summarized in Table 1.…”

Section: Analysis By Wide Angle X-ray Diffraction-(waxd)mentioning

confidence: 99%

“…Detailed investigations of the mechanisms of plastic deformation have been reported by Cohen et al [12][13][14] for semi-crystalline polymers as nylon, poly-(ethylene terephthalate) (PET) and high density polyethylene (HDPE). In general forms, microstructural changes in the levels of spherulites, lamella and amorphous phase [15][16][17] have been observed. The present study aims to expand the knowledge of morphological properties of iPP samples before and after deformation, prepared by plane strain compression.…”

Section: Introductionmentioning

confidence: 96%

“…[19,20] Additionally, as it is going to be demonstrated, the use of WAXD techniques for the characterization of the samples before and after deformation contributes to the elucidation of effects caused by the large plastic deformation process, approaching orientation and modification of the micro and nano structural properties, specially the a-monoclinic organization and the amorphous ''halo'' obtained and described in various studies. [17,21] …”

Section: Introductionmentioning

confidence: 98%

See 1 more Smart Citation

Large Plastic Deformation of Isotactic Poly(propylene) (iPP) Evaluated by WAXD Techniques

Samios

Tokumoto

Denardin

2005

Macromolecular Symposia

View full text Add to dashboard Cite

Summary: Commercial isotactic poly(propylene) (iPP), obtained in bars, was annealed and submitted to different levels of plastic deformation by uniaxial plane compression using a special device which permits well controlled temperature and strain rate. The evolution of the microstructure was followed at different degrees of deformation by wide angle x-ray diffraction (WAXD) techniques. The spherulite fragmentation process, lamellar orientation and destruction of the crystallites is argued, according to collected analytical data in the flow direction (FD), the loading direction (LD) and the lateral or constrain direction (CD). The evaluation of the WAXD patterns in terms of diffraction line position, intensity and width, permits to affirm that, while the large plastic deformation occurs, the crystalline net suffers anisotropic deformation, the crystallites become preferentially oriented along the flow direction and the crystalline phase diminish in amount indicating lesser and smaller crystallites. The gradual lamellae fragmentation occurs, starting with apparent crystalline size of approximately 30 nm for the non-deformed material and gradually decreasing to approximately 15 nm for the 70% deformed one.

show abstract

Crystalline properties and morphological changes in plastically deformed isotatic polypropylene evaluated by X-ray diffraction and transmission electron microscopy

Cited by 77 publications

References 44 publications

Investigation of the large plastic deformation of iPP induced by plane strain compression: Stress–strain behavior and thermo-mechanical properties

Investigation of the large plastic deformation of iPP induced by plane strain compression: Stress–strain behavior and thermo-mechanical properties

Melt-electrospinning of polypropylene with conductive additives

Large Plastic Deformation of Isotactic Poly(propylene) (iPP) Evaluated by WAXD Techniques

Contact Info

Product

Resources

About