Structure and properties of uni- and biaxially oriented polypropylene films: Part I - Structural characterization

Vries, de

doi:10.1351/pac198153051011

Cited by 44 publications

(8 citation statements)

References 10 publications

(12 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This is the most important stage for controlling the BOPP structures in the whole process. 19 Accordingly, studies on physical problems such as deformation, crystallization, orientation, and rheology during the stretching of extruded sheets are of great importance, both in theory and in practice. The wide-angle X-ray diffraction (WAXD) patterns of the tenter process BOPP film, the tube process BOPP film, and the tenter process extruded sheet are shown in Figure 1.…”

Section: Introductionmentioning

confidence: 99%

“…Commercial BOPP films have special inner structures obtained by the stretching of the thick, extruded sheets at high temperatures in the machine direction (MD) and in the transverse direction. This is the most important stage for controlling the BOPP structures in the whole process 19. Accordingly, studies on physical problems such as deformation, crystallization, orientation, and rheology during the stretching of extruded sheets are of great importance, both in theory and in practice.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Stress‐induced crystallization of biaxially oriented polypropylene

Yang

Xie

et al. 2003

J of Applied Polymer Sci

View full text Add to dashboard Cite

ABSTRACT:The hot stretching of thick, extruded sheets at high temperatures is a very important process in the production of finished biaxially oriented polypropylene (BOPP) films with special inner structures. Through a simulation of hot stretching in the machine direction (MD) of the processing of BOPP films, it was found that at high temperatures, the stretching ratio greatly influenced the obtained crystalline structure, as observed by differential scanning calorimetry (DSC). Also, in MD hot stretching, the crystallinity increased by an average of 20%. Wide-angle X-ray diffraction patterns of extruded sheet samples with and without stretching confirmed the structural changes shown by DSC, and the results proved that ␤-crystal modification did not occur during the MD hot-stretching process.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Stress‐induced crystallization of biaxially oriented polypropylene

Yang

Xie

et al. 2003

J of Applied Polymer Sci

View full text Add to dashboard Cite

show abstract

“…We used a parallel band at should be underestimated, and therefore mini-1042 cm 01 to study the effects of drawing condimum, orientation values. 15 tions on the molecular orientation of aliphatic copolyesters. The band at 1042 cm 01 is associated X-ray Diffraction Measurement with the asymmetric stretching vibration of O{C{C group of esters.…”

Section: Resultsmentioning

confidence: 99%

Effect of orientation on the biodegradability of uniaxially stretched aliphatic copolyester films

Lee

Hong

1997

J. Appl. Polym. Sci.

View full text Add to dashboard Cite

The effects of uniaxial drawing conditions on the orientation of aliphatic copolyester films were investigated by using both Fourier transform infrared-attenuated total reflection (FTIR-ATR) dichroism and wide angle X-ray diffraction (WAXD) methods. The results showed that orientation in uniaxially drawn films was determined by the drawing rate and drawing temperature. At higher drawing rates and higher drawing temperatures, higher orientation was obtained due to a large deformation of spherulites. The WAXD patterns of drawn films exhibited the preferential orientation of lamellar crystallites. The results of microbial degradation indicated that development of crystalline orientation evidently depressed biodegradability of samples. Video microscopy observations revealed that the degree of orientation played a dominant role in determining the rate of surface erosion.

show abstract

“…As a first approximation, the values of 0° for all parallel bands and 90° for all perpendicular bands are used. If the angle is between 0° and 90°, the orientation functions calculated assuming 0° or 90° should be underestimated values, and therefore minimum orientation values [15].…”

Section: Atr Analysismentioning

confidence: 99%