Correlations between processing parameters, morphology, and properties of blown films of LLDPE/LDPE blends, part 2: Crystalline and amorphous biaxial orientation by WAXD pole figures

Wiley - Tập 102 Số 3 - Trang 2760-2767 - 2006
Márcia Cristina Branciforti1, Lília M. Guerrini1, R. Machado1, Luís Antônio Pinheiro1
1Department of Materials Engineering, Federal University of São Carlos, São Carlos, São Paulo, Brazil

Tóm tắt

AbstractThe biaxial molecular orientation of blown films made of blends of linear low density polyethylene (LLDPE) with low density polyethylene (LDPE) was characterized by two different methods: complete pole figures obtained by wide angle X‐rays diffraction (WAXD) and polarized infrared spectroscopy (IR) using the Krishnaswamy approach. The molecular orientation of the blends amorphous phase was also evaluated by polarized IR. The crystallinity of the blown films was determined by WAXD. A good correlation between the X‐ray pole figures and the polarized IR results was obtained. At all blends compositions, it was shown that the a‐axis of the polyethylene orthorhombic cell was preferentially oriented along the machine direction, the orientation degree along this direction increasing with the increase of the LDPE amount in the blends. The b‐axis changed its preferential orientation from film thickness in the 100/0 LLDPE/LDPE film to along the transverse direction with increasing LDPE in the blends. The c‐axis changed its orientation from orthogonal to normal direction in the 100/0 LLDPE/LDPE film to along the film thickness with increasing LDPE in the blends. Polarized IR characterization showed a negligible orientation of the amorphous phase. The amount of crystallinity was dependent on blend composition decreasing with the increase of LDPE content in the blends. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 102: 2760–2767, 2006

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Tài liệu tham khảo

Utracki L. A., 1989, Polymer Alloys and Blends: Thermodynamics and Rheology

10.1002/(SICI)1099-0488(20000101)38:1<182::AID-POLB21>3.0.CO;2-R

10.1002/app.23358

Alexander L. E., 1969, X‐ray Diffraction Methods in Polymer Science

10.1016/S0032-3861(00)00363-3

10.1002/pen.760211309

Bunn C. W., 1989, Trans Faraday Soc, 35, 483

10.1016/S0032-3861(01)00301-9

10.1002/macp.1976.021770215

10.1016/S0032-3861(96)00307-2

10.1080/00222347008229369

10.1002/pol.1971.160090703

10.1002/pen.10342

10.1201/9781482295467

10.1590/S0104-14282004000100012

10.1002/polb.1992.090301011

10.1002/app.1978.070221001

10.1002/app.1978.070221002

10.1002/app.1978.070221003

10.1002/pol.1982.180200103

10.1002/adv.1988.060080105

10.1002/pen.760282305

10.1021/ma9464229

10.1002/app.1988.070350207

10.1016/S0032-3861(00)00136-1

10.1021/ma001031h

10.1080/00222346708212739

Keller A., 1997, Mater Sci Technol, 18, 189

10.1063/1.3051751

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Thông tin xuất bản

Wiley

Tập 102 Số 3

2760-2767

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