Tensile properties in the oriented blends of high-density polyethylene and isotactic polypropylene obtained by dynamic packing injection molding

Na, Bing; Wang, Ke; Zhang, Qin; Du, Rongni; Fu, Qiang

doi:10.1016/j.polymer.2005.01.094

Cited by 67 publications

(52 citation statements)

References 32 publications

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“…This agrees with the observations of Jose, 9 Finlay et al, 11 and Na et al 15 It emphasizes that the PP-rich blends are more compatible than the HDPE-rich blends.…”

Section: Morphologysupporting

confidence: 92%

Development of isotropic compatible HDPE/PP blends for structural applications

Zahran

El-Latif

Konsowa

et al. 2009

J of Applied Polymer Sci

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ABSTRACT:In an attempt to provide superior products for the structural applications, this study aimed at preparing isotropic compatible high density polyethylene (HDPE)/ polypropylene (PP) blends without the use of the expensive compatibilization technique. Morphological and structural characterizations of the homopolymers and blends were carried out. In addition, some of the structurally important mechanical and thermal properties were characterized. Such characterizations were performed to investigate whether or not the blends are compatible and therefore acceptable for the structural applications. Scanning electron microscope (SEM) micrographs of the blend samples indicate that the interfacial adhesion between HDPE and PP phases is intimate in the 5/95 HDPE-PP, good in the 85/15 HDPE-PP and 95/5 HDPE-PP, fair in the 30/70 HDPE-PP and very poor in the 50/50 HDPE-PP. Similarly, mechanical and thermal responses of the first three blends are remarkable. The 30/70 HDPE-PP blend displays a fairly good performance. Whereas, the properties of the 50/50 HDPE-PP blend are very poor. This decides that the first three blends are compatible and, therefore, structurally attractive materials. The fourth is partially compatible and, as a consequence, can be rather acceptable for the structural applications. However, the fifth is incompatible and, of course, is not acceptable for such applications. On the other hand, SEM micrographs and differential scanning calorimetry results indicate that the crystalline structures of individual polymers are appreciably affected by blending. Additionally, the study reveals that the end use performance of blends is strongly dependent on the crystalline structure changes occurring in each component due to blending as well as the compatibility between the blend components.

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“…This agrees with the observations of Jose, 9 Finlay et al, 11 and Na et al 15 It emphasizes that the PP-rich blends are more compatible than the HDPE-rich blends.…”

Section: Morphologysupporting

confidence: 92%

Development of isotropic compatible HDPE/PP blends for structural applications

Zahran

El-Latif

Konsowa

et al. 2009

J of Applied Polymer Sci

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“…∆H i m , the enthalpy of fusion of 100% crystalline polymer, are 293 J/g for PE 73 and 205 J/g for PEO. 74 …”

Section: Role Of Swnts On Shaping the Semicrystalline Framework Of Pementioning

confidence: 99%

Comparison Study of Morphology and Crystallization Behavior of Polyethylene and Poly(ethylene oxide) on Single-Walled Carbon Nanotubes

Zheng

2010

J. Phys. Chem. B

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In this work, we provided a comparison study of morphology and crystallization behavior of polyethylene (PE) and poly(ethylene oxide) (PEO) on single-walled carbon nanotubes (SWNTs) with assistance of supercritical CO(2). The resulting polymer/SWNT nanohybrids were characterized by transmission electron microscopy, scanning electron microscopy, Fourier transform infrared spectroscopy, Raman spectra, wide-angle X-ray diffraction, and differential scanning calorimetry. SWNT small bundles were decorated by PE lamellar crystals, forming nanohybrid "shish-kebab" (NHSK) structure, whereas SWNTs were only wrapped by a thin amorphous polymer coating in the case of PEO. The varying morphologies of the nanohybrids were found to depend on the molecular conformation and the interactions between polymer chains and SWNTs. Nonisothermal experiments showed that SWNTs provided heterogeneous nucleation sites for PE crystallization, while the NHSK structure hindered polymer chain diffusion and crystal growth. Also, SWNTs played antinucleation effect on PEO. In addition, the formation mechanism analysis indicated that PE chains preferred to form a homogeneous coating along the tube axis before proceeding to kebab crystal growth. The purpose of this work is to enlarge the area of theoretical understanding of introducing precisely hierarchical structures on carbon nanotubes, which are important for functional design in nanodevice applications.

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“…DH m i , the enthalpy of fusion of 100% crystalline polymer, is 209 J/g for PP [31]. The non-isothermal crystallization behavior of the specimens was investigated by melting the samples (about 5 mg) at 200 C for 5 min to erase any thermal history and prevent self-seeding of PP and then cooling them to 30 C at a cooling rate of 10 C/min.…”

Section: Differential Scanning Calorimetry (Dsc)mentioning

confidence: 99%