On the morphology of polyethylene crystallized from a sheared melt

Hosier, I. L.; Bassett, D. C.; Moneva, Ivanka

doi:10.1016/0032-3861(95)92213-x

Cited by 50 publications

(25 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…[21][22][23][24][25] Bashir and Odell 14 regarded the presence of longitudinal and transverse velocity gradients, the strain rate, the strain time, and the temperature of the flow as important parameters to extend the chains by the flow.…”

Section: Dpim and Static Packing Injection Molding (Spim)mentioning

confidence: 99%

Biaxially self‐reinforced high‐density polyethylene prepared by dynamic packing injection molding. I. Processing parameters and mechanical properties

Lei

Jiang

Shen

2004

J of Applied Polymer Sci

View full text Add to dashboard Cite

Uniaxial oscillating stress field by dynamic packing injection molding (DPIM) is well established as a means of producing uniaxially self-reinforced polyethylene and polypropylene. Here, the effects on the mechanical properties of high-density polyethylene (HDPE) in both flow direction (MD) and transverse direction (TD) of packing modules and processing parameters in DPIM are described. Both biaxially and uniaxially self-reinforced HDPE samples are obtained by uniaxial shear injection molding.The most remarkable biaxially self-reinforced HDPE specimens show a 42% increase of the tensile strength in both MD and TD. The difference of stress-strain behavior and impact strength between MD and TD for the DPIM moldings indicates the asymmetry of microstructure in the two directions.

show abstract

Section: Dpim and Static Packing Injection Molding (Spim)mentioning

confidence: 99%

Biaxially self‐reinforced high‐density polyethylene prepared by dynamic packing injection molding. I. Processing parameters and mechanical properties

Lei

Jiang

Shen

2004

J of Applied Polymer Sci

View full text Add to dashboard Cite

show abstract

“…The existence of these organized structures is not exclusive of the elongational flow. Several investigations show that shear flow may produce orientation in the polymer melt, which templates the subsequent crystallization [2][3][4][5][6]. The orientation in the semicrystalline material is therefore, directly related to the orientation in the polymer melt induced by the flow field.…”

Section: Introductionmentioning

confidence: 98%

Development of highly oriented polymer crystals from row assemblies

Nogales

Mitchell

2005

Polymer

View full text Add to dashboard Cite

“…[2] Such extended objects act as row nuclei for subsequent lamellar growth in a direction normal to the flow direction. [3,4] The response of a particular polymer during flow depends greatly on the molecular mass distribution and the associated relaxation spectrum. [5] In the system considered here, the low-molar-mass self-assembled nanoparticles play the part of the extended chains.…”

Section: Introductionmentioning

confidence: 99%

Directed Crystallisation of Poly(ε‐caprolactone) using a Low‐Molar‐Mass Self‐Assembled Template

Wangsoub

Olley

Mitchell

2005

Macro Chemistry & Physics

View full text Add to dashboard Cite

Summary: We show that small quantities of dibenzylidene sorbitol dispersed in poly(ε‐caprolactone) coupled with shear flow provide a self‐assembling nanoscale framework to yield high levels of crystal orientation. During modest shear flow of the melt, the additive forms highly extended nanofibrils which adopt a preferred alignment with respect to the flow field, and on cooling polymer crystallisation is directed by these fibrils. We use in situ time‐resolving SAXS and WAXS techniques to explore how this behaviour can be modified by the composition, the shear rate and strain as well as the temperature at which the shear flow is imposed. SAXS studies show that the 3% DBS completely dissolves in the PCL melt at temperatures ≥120 °C and that any shear flow imposed at temperatures above such values is ineffective in directing crystallisation.

show abstract

On the morphology of polyethylene crystallized from a sheared melt

Cited by 50 publications

References 7 publications

Biaxially self‐reinforced high‐density polyethylene prepared by dynamic packing injection molding. I. Processing parameters and mechanical properties

Biaxially self‐reinforced high‐density polyethylene prepared by dynamic packing injection molding. I. Processing parameters and mechanical properties

Development of highly oriented polymer crystals from row assemblies

Directed Crystallisation of Poly(ε‐caprolactone) using a Low‐Molar‐Mass Self‐Assembled Template

Contact Info

Product

Resources

About