Rheological properties and crystallization behaviors of long chain branched polyethylene prepared by melt branching reaction
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Xiao-kun Liang
,
Le Yang
Abstract
Long chain branched polyethylene (LCBPE) without gel was prepared by melt branching reaction in a Haake torque rheometer in the presence of peroxide and different multi-functional acrylate monomers, and the optimal reaction time was determined according to the transient torque curves. The Fourier transform infrared (FTIR) results indicated that multi-functional monomers had been grafted onto HDPE backbone. Rheometer, 13C NMR, and high-temperature gel permeation chromatography (HT-GPC) coupled with triple detectors were used to characterize the microstructure of the LCBPE. The results showed the LCB content and the degree of branching increased with the increasing of functionality of the multi-functional monomers. Moreover, the LCBPE samples exhibited higher apparent zero shear rate activation energy and clear strain-hardening behavior compared with pure HDPE. Various rheological plots including viscosity, storage modulus, loss angle, and Cole-Cole plots were used to distinguish LCBPE from linear HDPE. A possible mechanism for melt branching reaction was also discussed in this paper. Differential scanning calorimetry (DSC) and polarized optical microscopy (POM) were used to study the influences of LCB on the crystallization behavior and crystal morphology of all samples. It was found that the melt temperature and crystal morphologies of LCBPE were evidently different from that of pure HDPE due to the introduction of LCB.
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©2018 Walter de Gruyter GmbH, Berlin/Boston
Articles in the same Issue
- Frontmatter
- Original articles
- Antistatic surface properties of plastics using donor-accepter molecular compounding antistatic agent
- Rheological properties and crystallization behaviors of long chain branched polyethylene prepared by melt branching reaction
- An investigation into the structure and morphology of polyamide 6/polyaniline hybrid fibers
- Natural rubber/tetra-needle-like zinc oxide whisker composites: their preparation and characterization
- Fabrication of short glass fiber reinforced phenol-formaldehyde-lignin and polyurethane-based composite foam: mechanical, friability, and shape memory studies
- Effect of the particle diameter of the chemical foaming agent on the foaming process and the cellular structure of one-shot compression molded polyethylene foams
- Recycling waste tire rubber by water jet pulverization: powder characteristics and reinforcing performance in natural rubber composites
- Monitoring of the injection and holding phases by using a modular injection mold
- Influence of mold temperature and process time on the degree of cure of epoxy-based materials for thermoset injection molding and prepreg compression molding
- Calendering of non-isothermal Rabinowitsch fluid
- Simulation of dynamic gas penetrations on fingering behaviors during gas-assisted injection molding
Articles in the same Issue
- Frontmatter
- Original articles
- Antistatic surface properties of plastics using donor-accepter molecular compounding antistatic agent
- Rheological properties and crystallization behaviors of long chain branched polyethylene prepared by melt branching reaction
- An investigation into the structure and morphology of polyamide 6/polyaniline hybrid fibers
- Natural rubber/tetra-needle-like zinc oxide whisker composites: their preparation and characterization
- Fabrication of short glass fiber reinforced phenol-formaldehyde-lignin and polyurethane-based composite foam: mechanical, friability, and shape memory studies
- Effect of the particle diameter of the chemical foaming agent on the foaming process and the cellular structure of one-shot compression molded polyethylene foams
- Recycling waste tire rubber by water jet pulverization: powder characteristics and reinforcing performance in natural rubber composites
- Monitoring of the injection and holding phases by using a modular injection mold
- Influence of mold temperature and process time on the degree of cure of epoxy-based materials for thermoset injection molding and prepreg compression molding
- Calendering of non-isothermal Rabinowitsch fluid
- Simulation of dynamic gas penetrations on fingering behaviors during gas-assisted injection molding
