The effect of annealing temperature on the fracture performance of isotactic polypropylene

Frontini, Patricia María; Fave, Alain

doi:10.1007/bf01184599

Cited by 59 publications

(45 citation statements)

References 23 publications

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“…In general, the smectic phase of iPP can transform to the more stable crystalline phase (α-form) through annealing at appropriate temperature, i.e. 70-150 °C or by applying plastic deformation [3,5,20,[36][37][38][39][40][41]. Such results have also confirmed in our previous work for iPP thin film annealed at 110 °C for 2 h [48].…”

Section: Microstructural Developmentsupporting

confidence: 68%

“…Such annealing also changes the morphological modification of crystal regions through lamellae thickening in the semi-crystalline polymers. The effect of annealing at macroscopic level is one of important factors to improve mechanical properties of the materials such as Young's modulus, impact strength, tensile strength, and toughness [1][2][3][4][38][39][40][41]. From above reasons, the effects of annealing of PP on its mechanical, impact and fracture properties, crystalline structure, phase transformation, crystallization behavior, elastic response as well as morphology have gained much attention in the last decade [1-3, 39, 40, 43-47].…”

Section: Introductionmentioning

confidence: 99%

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Influence of annealing on microstructure & molecular orientation, thermal behaviour, mechanical properties and their correlations of uniaxially drawn iPP thin film

Saengsuwan

2008

E-Polymers

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Abstract:The influence of annealing on the microstructure and molecular orientation, thermal behaviour and mechanical properties of uniaxially drawn iPP thin film was studied by wide-angle X-ray diffraction, differential scanning calorimetry and tensile testing, respectively. The correlations of mechanical and microstructural properties of annealed films were also examined. The transformation of smectic phase of iPP to the α-form was more pronounced with increasing annealing time and temperature. The true and apparent crystallinities and crystal thickness were strongly enhanced with annealing time and temperature. The relative molecular orientation tended to increase with annealing time. These results caused the significant improvement of modulus and tensile strength of the annealed films in both machine (MD) and transverse (TD) directions. The increases in MD-Young's modulus and MD-tensile strength were well correlated with the increase in true crystallinity obtained in equatorial scans. Some relationship between the increase in crystal thickness and the increase in Young's modulus in both MD and TD directions was also found.

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Section: Microstructural Developmentsupporting

confidence: 68%

Section: Introductionmentioning

confidence: 99%

Influence of annealing on microstructure & molecular orientation, thermal behaviour, mechanical properties and their correlations of uniaxially drawn iPP thin film

Saengsuwan

2008

E-Polymers

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“…The spherulite morphology attained at the annealing temperature remained as the sample cooled. Annealing causes the semicrystalline morphology to coarsen, 8 the crystallinity to rise, 9 and gives a narrower distribution of lamellar sizes. 8 The size of spherulite, however, is expected to remain unchanged.…”

Section: Introductionmentioning

confidence: 99%

The morphology of irradiated isotactic polypropylene

Zhang

Cameron

1999

J. Appl. Polym. Sci.

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ABSTRACT:The research in this article explores the response of semicrystalline isotactic polypropylene to gamma radiation in air, and relates the morphological changes of the polymer to corresponding changes in mechanical properties. The effect of the initial morphology of the polymer on its response to irradiation is considered using infrared spectroscopy (FTIR), small-and wide-angle X-ray scattering, dynamic mechanical thermal analysis (DMTA), and mechanical testing. The extent of chain scission and crosslinking is dependent on the dose but not the initial starting morphology. These chemical changes cause the crystallinity to increase slightly, and the glass transition temperature to rise by a few degrees in all samples, but the overall morphology is only subtly changed. In contrast, a major deterioration in mechanical properties is caused. The effects of the irradiation observed under these conditions are similar in each material and the ultimate properties determined by the properties seen in the original material.

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“…Recently, some articles have studied the influence of annealing on the mechanical properties, such as shock resistance, of polypropylene (PP) pieces and have proved that the toughness of both homopolymer and copolymer of PP pieces can be improved substantially. [1][2][3] However, few studies on fracture toughness together with the deformation behavior of PP films and sheets have been undertaken to our knowledge, probably because the conventional methods of evaluating the fracture properties of ductile sheets and films still present some problems, and it is difficult to find a reliable way to study the fracture toughness of ductile polymer.…”

Section: Introductionmentioning

confidence: 99%

Effect of annealing on fracture behavior of poly(propylene‐block‐ethylene) using essential work of fracture analysis

Xie

Yang

et al. 2006

J of Applied Polymer Sci

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The influence of annealing conditions on the fracture behavior of poly(propylene-block-ethylene) sheets was investigated by means of the essential work of fracture method, and was complemented by the study of the effect of annealing on crystal structure, using differential scanning calorimetry. It was shown that both the crystal perfection degree and crystallinity could be improved substantially as annealing temperature (Ta) increased, while the prolonged annealing time at 808C mainly resulted in the improvement of crystallinity. The reasons for an increase in the specific essential work of fracture and a decrease in the specific plastic work item as crystal perfection degree and crystallinity grew are discussed. The displacement to failure of double edge notched tension specimens decreased gradually with increasing T a , and the double-plastic zone could be observed in all specimens. In addition, a novel method to aid the accurate measurement of intense stress-whitening outer plastic zone height by adjustment of illumination conditions is proposed.

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The effect of annealing temperature on the fracture performance of isotactic polypropylene

Cited by 59 publications

References 23 publications

Influence of annealing on microstructure & molecular orientation, thermal behaviour, mechanical properties and their correlations of uniaxially drawn iPP thin film

Influence of annealing on microstructure & molecular orientation, thermal behaviour, mechanical properties and their correlations of uniaxially drawn iPP thin film

The morphology of irradiated isotactic polypropylene

Effect of annealing on fracture behavior of poly(propylene‐block‐ethylene) using essential work of fracture analysis

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