Structure and properties of self‐reinforced polyethylene prepared by oscillating packing injection molding under low pressure

Guan, Qing; Shen, Kaizhi; Ji, Jiliang; Zhu, Jianguo

doi:10.1002/app.1995.070551310

Cited by 96 publications

(79 citation statements)

References 12 publications

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“…[4][5][6] In our previous articles, tensile strength and Young's modulus of high-density polyethylene (HDPE) increased from 27.8 MPa and 1.0 GPa to 108 MPa and 5.0 GPa, respectively. 7 As for polypropylene, strength and modulus increased from 33.4 MPa and 1.4 GPa to 58.0 MPa and 3.0 GPa. 8 Similarly, the strength of acrylonitrile-butyldiene-styrene (ABS), an amorphous material, increased from 46 MPa to 54 MPa.…”

Section: Introductionmentioning

confidence: 97%

Self-reinforcement of high-density polyethylene/low-density polyethylene prepared by oscillating packing injection molding under low pressure

Zhang¹,

Jiang²,

Shen³

et al. 1999

J. Appl. Polym. Sci.

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This article reports the toughness improvement of high-density polyethylene (HDPE) by low-density polyethylene (LDPE) in oscillating packing injection molding, whereas tensile strength and modulus are greatly enhanced by oscillating packing at the same time. Compared with self-reinforced pure HDPE, the tensile strength of HDPE/LDPE (80/20 wt %) keeps at the same level, and toughness increases. Multilayer structure on the fracture surface of self-reinforced HDPE/LDPE specimens can be observed by scanning electron microscope. The central layer of the fracture surface breaks in a ductile manner, whereas the break of shear layer is somewhat brittle. The strength and modulus increase is due to the high orientation of macromolecules along the flow direction, refined crystallization, and shish-kebab crystals. Differential scanning calorimetry and wide-angle X-ray diffraction find cocrystallization occurs between HDPE and LDPE.

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Section: Introductionmentioning

confidence: 97%

Self-reinforcement of high-density polyethylene/low-density polyethylene prepared by oscillating packing injection molding under low pressure

Zhang¹,

Jiang²,

Shen³

et al. 1999

J. Appl. Polym. Sci.

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“…Nevertheless, our previous work revealed that the self-reinforced HDPE prepared by dynamic packing injection molding (DPIM) featured orientated shish-kebab morphology. [1][2][3][4][5][6][7] Further, Bashir and Odell reported the high-modulus, high-strength splinter-resistant thick HDPE filaments produced in uniaxial flow by capillary extrusion had a specific interlocking shish-kebab morphology. They predicted the existence of this morphology could result in good mechanical properties in both flow direction (MD) and transverse direction (TD).…”

Section: Introductionmentioning

confidence: 99%

Biaxially self‐reinforced high‐density polyethylene prepared by dynamic packing injection molding. II. Microstructure investigation

Lei

Jiang

Shen

2004

J of Applied Polymer Sci

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Differential scanning calorimetry, wideangle X-ray diffraction, small-angle X-ray scattering, and transmission electron microscope are employed to study the microstructure of biaxially self-reinforced high-density polyethylene (HDPE) prepared in uniaxial oscillating stress field by dynamic packing injection molding. The results indicate that the biaxial self-reinforcement of HDPE is mainly due to the existence of interlocking shishkebab morphology (i.e., zip fastener structure), along with the orientation of lamellae and molecular chains and the enhanced crystallinity.

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“…58 Although the thermomechanical environment associated with such a processing route 59 differs substantially from that encountered in SCORIM, the structural consequences are believed to be analogous for the two processes. Other molding techniques that also induce the shish-kebab formation and consequently lead to significant improvement of mechanical performance (in terms of stiffness and strength) are the high-pressure injection molding 60 -62 and the oscillating packing injection molding; 63,64 this latter molding technique being a replica of the SCORIM process.…”

Section: Structure Development Of the Hdpe Matrixmentioning

confidence: 99%

Structure development and interfacial interactions in high‐density polyethylene/hydroxyapatite (HDPE/HA) composites molded with preferred orientation

Sousa

Reis

Cunha

et al. 2002

J of Applied Polymer Sci

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ABSTRACT:Composites of high-density polyethylene (HDPE) filled with sintered and nonsintered hydroxyapatite (HA) powders, designated as HAs and HAns, respectively, were compounded by twin screw extrusion. Compounds with neoalkoxy titanate or zirconate coupling agents were also produced to improve interfacial interaction and filler dispersion in the composites. The composites were molded into tensile test bars using (i) conventional injection molding and (ii) shear-controlled orientation in injection molding (SCORIM). This latter molding technique was used to deliberately induce a strong anisotropic character to the composites. The mechanical characterization included tensile testing and microhardness measurements. The morphology of the moldings was studied by both polarized light microscopy and scanning electron microscopy, and the structure developed was assessed by wide-angle X-ray diffraction. The reinforcing effect of HA particles was found to depend on the molding technique employed. The higher mechanical performance of SCORIM processed composites results from the much higher orientation of the matrix and, to a lesser extent, from the superior degree of filler dispersion compared with conventional moldings. The strong anisotropy of the SCORIM moldings is associated with a clear laminated morphology developed during shear application stage. The titanate and the zirconate coupling agents caused significant variations in the tensile test behavior, but their influence was strongly dependent on the molding technique employed. The application of shear associated with the use of coupling agents promotes the disruption of the HA agglomerates and improves mechanical performance.

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Structure and properties of self‐reinforced polyethylene prepared by oscillating packing injection molding under low pressure

Cited by 96 publications

References 12 publications

Self-reinforcement of high-density polyethylene/low-density polyethylene prepared by oscillating packing injection molding under low pressure

Self-reinforcement of high-density polyethylene/low-density polyethylene prepared by oscillating packing injection molding under low pressure

Biaxially self‐reinforced high‐density polyethylene prepared by dynamic packing injection molding. II. Microstructure investigation

Structure development and interfacial interactions in high‐density polyethylene/hydroxyapatite (HDPE/HA) composites molded with preferred orientation

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