Structural evolution of tensile deformed high-density polyethylene at elevated temperatures: Scanning synchrotron small- and wide-angle X-ray scattering studies

Jiang, Zhiyong; Tang, Yujing; Rieger, Jens; Enderle, Hans-Friedrich; Lilge, Dieter; Roth, Stephan V.; Gehrke, Rainer; Wu, Zhonghua; Li, Zhihong; Men, Yongfeng

doi:10.1016/j.polymer.2009.06.063

Cited by 135 publications

(133 citation statements)

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“…The microscopic structural changes during hot drawing of HDPE have been intensively investigated by Men and coworkers [9,37,38]. They have reported the effect of the drawing temperature and the lamellar thickness on the void formation.…”

Section: Resultsmentioning

confidence: 99%

Rheo-optical Raman study of microscopic deformation in high-density polyethylene under hot drawing

2015

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In situ observation of the microscopic structural changes in high-density polyethylene during hot drawing was performed by incorporating a temperature-controlled tensile machine into a Raman spectroscopy apparatus. It was found that the load sharing and molecular orientation during elongation drastically changed at 50°C. The microscopic stress of the crystalline chains decreased with increasing temperature and diminished around 50°C. Moreover, the orientation of the crystalline chains was greatly promoted above 50°C. These microscopic structural changes were caused by the thermal activation of the molecular motion within lamellar crystalline chains owing to the onset of relaxation of the crystalline phase.

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Section: Resultsmentioning

confidence: 99%

Rheo-optical Raman study of microscopic deformation in high-density polyethylene under hot drawing

2015

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“…As discussed in our previous investigations, for a semiquantitative discussion of the dependence of the long spacing on the strain, the type of data treatment (Lorentz correction versus no correction) plays only a subordinate role. [26][27][28] Consequently, Lorentz-corrected scattering curves were applied in the present work to evaluate the microstructural parameters. The average thicknesses of the crystalline lamellae and amorphous layers measured along the stretching direction can be derived from the one-dimensional electron density correlation function K(z) as follows: [41][42][43][44][45] …”

Section: In Situ Saxs Resultsmentioning

confidence: 99%

“…The characteristics of the evolution of the microstructure in the systems during stretching follow a common scheme as discussed before for isotropic semicrystalline polymers. 27,28,40 Figure 13 presents the variation of SAXS diagrams with strain for the skin layers of micro-molded mixtures. As can be seen, the SAXS pattern shows a highly anisotropic scattering distribution prior to deformation indicating an oriented lamellar structure along the flow direction.…”

Section: Scanning Saxs Resultsmentioning

confidence: 99%

“…1,[19][20][21][22][23] The behavior of the polymers during stretching is generally influenced by both the crystalline and the amorphous phases. 12,[24][25][26][27][28] The small-deformation properties are found to depend only on the nature of crystalline lamellae; whereas the ultimate properties are dominated by the entangled amorphous network. 11,13,25 Poly(ε-caprolactone) (PCL) is a biodegradable polymer, which can form homogeneous mixtures in the melt and solution with a wealth of other noncrystallizable compounds, including poly(vinyl methyl ether) (PVME), 24,29 poly(styrene-co-acrylonitrile), 30,31 and poly(vinyl chloride).…”

Section: Introductionmentioning

confidence: 99%

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Tensile Deformation of Oriented Poly(ε-caprolactone) and Its Miscible Blends with Poly(vinyl methyl ether)

Jiang

Wang

et al. 2013

Macromolecules

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The structural evolution of micro-molded poly(ε-caprolactone) (PCL) and its miscible blends with noncrystallizable poly(vinyl methyl ether) (PVME) at the nanoscale was investigated as a function of deformation ratio and blend composition using in situ synchrotron small-angle X-ray scattering (SAXS) and scanning SAXS techniques. It was found that the deformation mechanism of the oriented samples shows a general scheme for the process of tensile deformation: crystal block slips within the lamellae occur at small deformations followed by a stress-induced fragmentation and recrystallization process along the drawing direction at a critical strain where the average thickness of the crystalline lamellae remains essentially constant during stretching. The value of the critical strain depends on the amount of the amorphous component incorporated in the blends, which could be traced back to the lower modulus of the entangled amorphous phase and, therefore, the reduced network stress acting on the crystallites upon addition of PVME. When stretching beyond the critical strain the slippage of the fibrils (stacks of newly formed lamellae) past each other takes place resulting in a relaxation of stretched interlamellar amorphous chains. Because of deformation-induced introduction of the amorphous PVME into the interfibrillar regions in the highly oriented blends, the interactions between fibrils becomes stronger upon further deformation and thus impeding sliding of the fibrils to some extent leading finally to less contraction of the interlamellar amorphous layers compared to the pure PCL.3

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“…At the same time we made a breakthrough in the blended yarn and textile processing of International Conference on Materials, Environmental and Biological Engineering (MEBE 2015) polyamidefiber, and laid the foundation for the production and development of bio-based polyamidefiber. Bio-based polyamide56 fiber is expected to be advanced materials used in clothing and industrial textiles [9][10][11][12]. This paper discusses on several basic performances closely related to applications of textile and apparel.…”

Section: Introductionmentioning

confidence: 99%

Study on the Structure and Properties of Novel Bio-based Polyamide56 Fiber Compared with Normal Polyamide Fibers

Hao¹,

Guo²,

Li³

et al. 2015

Proceedings of the 2015 International Conference on Materials, Environmental and Biological Engineering

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Abstract. The new kind of bio-based polyamide56 fiber has been synthesized by adipic acid and 1,5-pentanediamine, which was prepared by fermenting a variety of starch. The spin ability, physical and thermal properties of bio-based PA56, PA 6 and PA 66 were evaluated through systematic investigation and measurement. Bio-based polyamide56 resin has been proved to have good spin ability. PA56 have more concentrated distribution of molecular weight than other nylons, which indicated more stable viscosity beneficial for spinning and higher fiber strength. The infrared spectrum showed characteristic amide and methylene absorption peaks of PA56 but different vibration intensities with conventional nylon, which demonstrates different molecular structure. Differential scanning calorimetry combined with thermal gravimetric revealed good heat resistance (the thermal decomposition temperature is 403.7 °C) and high melting-point (254.1 °C) of polyamide56. X-ray diffraction of these fibers were proposed and showed that slightly higher crystallinity of polyamide56 so as to have more regular arrangement of molecular.

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Structural evolution of tensile deformed high-density polyethylene at elevated temperatures: Scanning synchrotron small- and wide-angle X-ray scattering studies

Cited by 135 publications

References 58 publications

Rheo-optical Raman study of microscopic deformation in high-density polyethylene under hot drawing

Rheo-optical Raman study of microscopic deformation in high-density polyethylene under hot drawing

Tensile Deformation of Oriented Poly(ε-caprolactone) and Its Miscible Blends with Poly(vinyl methyl ether)

Study on the Structure and Properties of Novel Bio-based Polyamide56 Fiber Compared with Normal Polyamide Fibers

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