Citation: Hong-ting Pu, Jun-feng Cheng. Orientation of LDPE Crystals from Microscale to Nanoscale via Microlayer or Nanolayer Coextrusion[J]. Chinese Journal of Polymer Science, ;2016, 34(12): 1411-1422. doi: 10.1007/s10118-016-1850-0 shu

Orientation of LDPE Crystals from Microscale to Nanoscale via Microlayer or Nanolayer Coextrusion

School of Materials Science and Engineering, Tongji University, Shanghai 201804, China

Received Date: 13 May 2016
Revised Date: 18 June 2016
Accepted Date: 18 June 2016

Fund Project: Major Program for Fundamental Research of Shanghai Science & Technology Commission 14JC1492700the Fundamental Research Funds for the Central Universities 0500219216

The microlayer or nanolayer coextrusion of hundreds or thousands of alternating low density polyethylene (LDPE)/polystyrene (PS) microlayers or nanolayers were used to study the orientation of LDPE crystals in the confined quasi-two-dimensional or two-dimensional space. The clear and continuous layer structures from microscale to nanoscale can be found in SEM images. The morphology evolution of LDPE crystals in the confined microlayer or nanolayer can be varied from 3D spherulites, 2D spherulites, stacked edge-on lamellar, to single edge-on lamellar. Due to the orientation of the LDPE crystals, the tensile strength of the films increases obviously when the layer thickness reduces to nanoscale. The 2D small angle X-ray scattering (SAXS) patterns can reflect the average degree of orientation of LDPE in the confined layers. The stacking of LDPE lamellae is suppressed in interlamination and oppositely in parallel to the extrusion direction. The specific orientation function f can be calculated from the patterns. The infrared dichroism further confirms the mutation of the orientation of LDPE crystals from microscale to nanoscale in the confined space.
- Microlayer or nanolayer coextrusion,
- Low density polyethylene,
- Polystyrene,
- Confined space,
- Crystal orientation
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