Influence of molecular architecture and melt rheological characteristic on the optical properties of LDPE blown films

Zhu, Haijin; Wang, Yanfang; Zhang, Xiuqin; Su, Yifan; Dong, Xia; Chen, Qingkui; Zhao, Ying; Geng, C; Zhu, Shifan; Han, Charles C.; Wang, Dujin

doi:10.1016/j.polymer.2007.06.044

Cited by 19 publications

(12 citation statements)

References 23 publications

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“…The level of crystallinity (X c ) was calculated as expressed in Eq. 1 [30], where Δ H m is the enthalpy of fusion obtained from the integral area of a DSC heating curve, and Δ H 0 is the enthalpy of fusion for polyethylene with 100% crystallinity (290 J/g).…”

Section: Methodsmentioning

confidence: 99%

Mechanical strengths of molten and solidified LLDPE/LDPE blends and wood/LDPE composites under tensile deformation

Harnnarongchai¹,

Sitticharoen²,

Intawong³

et al. 2011

Vinyl Additive Technology

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The mechanical strengths of neat low‐density polyethylene (LDPE), a blend of LDPE with linear low‐density polyethylene (LLDPE), and a composite of LDPE with wood flour (wood/LDPE) were investigated in molten and solidified states under tensile deformation. The results are discussed in terms of the effects of LLDPE and wood contents, roller speed, and volumetric flow rate. In LLDPE/LDPE blends, incorporating LLDPE from 0 to 30 wt% into LDPE caused a slight increase in drawdown force, a larger fluctuation in drawdown force, and a reduction of maximum roller speed to failure. The mechanical properties of the solidified LLDPE/LDPE corresponded to those of the molten LLDPE/LDPE with regard to the effect of LLDPE content. For wood/LDPE composites, increasing the wood flour content in molten LDPE caused considerable reductions in drawdown time and maximum roller speed to failure. The drawdown force increased with increasing wood flour up to 10 wt% before it decreased at the wood loading of 20 wt%. A number of voids and pores on the extrudate surfaces became obvious for the composites with 20 wt% of wood content. Increasing wood content enhanced the tensile modulus for the solidified LDPE but decreased its tensile strength. Unlike those of LLDPE/LDPE blends, the changes in tensile modulus and strength of solidified wood/LDPE composites with wood content did not correspond to those of the molten composites. In all cases, the drawdown force increased with increasing roller speed. The effect of volumetric flow rate from the extruder on the mechanical strengths of the solidified blends was more pronounced than on those of the molten ones. J. VINYL ADDIT. TECHNOL., 2011. © 2011 Society of Plastics Engineers

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Section: Methodsmentioning

confidence: 99%

Mechanical strengths of molten and solidified LLDPE/LDPE blends and wood/LDPE composites under tensile deformation

Harnnarongchai¹,

Sitticharoen²,

Intawong³

et al. 2011

Vinyl Additive Technology

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“…The thermograms were acquired at a heating rate of 10 °C/min over a range of 25–150 °C. The percentage of crystallinity was calculated using the following equation: χ = ( Δ H exp / Δ H ° ) × 100 where Δ H exp is the heat of fusion of the samples obtained from the DSC results after integrating the area under the curve (endothermic peak), and Δ H ° is the heat of fusion with 100% crystallinity LDPE, where 290 J/g was used in this study …”

Section: Experimental Sectionmentioning

confidence: 99%

Effect of Molding Parameters on Young’s Modulus of an Injection Molded Low-Density Polyethylene (LDPE)

Leyva‐Porras

Esneider-Alcalá

Toxqui-Terán

et al. 2013

Ind. Eng. Chem. Res.

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Injection molding is a process employed worldwide to manufacture polymer parts. The final properties of the molded part largely depend on the processing conditions used during the manufacturing process. Therefore, it is necessary to develop empirical approaches that help to understand the relationship between the processing conditions and the final properties of the polymer. In this paper we study the effect of the processing conditions of the injection molding process on the Young’s modulus of a low-density polyethylene (LDPE). The effect of both the barrel temperature and the mold temperature was investigated using analysis of variance (ANOVA) and the effect of the levels of each parameter was examined using the surface response methodology (SRM). The ANOVA results showed that the mold temperature is the parameter that most significantly impacts the Young’s modulus, followed by the barrel temperature, while the combined interaction of both is negligible. SRM showed that the Young’s modulus increases with the mold temperature and decreases with the barrel temperature. Based on the SRM, an empirical equation is proposed which can be used to predict the modulus employing only the barrel and mold temperatures. The changes in the microstructure of the injection molded part are discussed in terms of the crystallinity degree. All this was corroborated with X-ray diffraction (XRD) and differential scanning calorimetry (DSC).

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“…Many studies on the influence of long-chain branching on the rheological properties of conventional polyolefins such as PE [ 1 , 3 , 5 , 6 , 7 , 8 , 9 , 10 , 11 ] or PP [ 4 , 12 , 13 , 14 ] have been carried out. In general, the authors agree on a definition of LCB (from a rheological point of view) as being branches whose weight is higher than the critical mass for entanglements, M c .…”

Section: Introductionmentioning

confidence: 99%

Shear and Extensional Rheology of Linear and Branched Polybutylene Succinate Blends

Bourg

Valette

Moigne³

et al. 2021

Polymers

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The molecular architecture and rheological behavior of linear and branched polybutylene succinate blends have been investigated using size-exclusion chromatography, small-amplitude oscillatory shear and extensional rheometry, in view of their processing using cast and blown extrusion. Dynamic viscoelastic properties indicate that a higher branched polybutylene succinate amount in the blend increases the relaxation time due to an increased long-chain branching degree. Branched polybutylene succinate exhibits pronounced strain hardening under uniaxial elongation, which is known to improve processability. Under extensional flow, the 50/50 wt % blend exhibits the same behavior as linear polybutylene succinate.

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Influence of molecular architecture and melt rheological characteristic on the optical properties of LDPE blown films

Cited by 19 publications

References 23 publications

Mechanical strengths of molten and solidified LLDPE/LDPE blends and wood/LDPE composites under tensile deformation

Mechanical strengths of molten and solidified LLDPE/LDPE blends and wood/LDPE composites under tensile deformation

Effect of Molding Parameters on Young’s Modulus of an Injection Molded Low-Density Polyethylene (LDPE)

Shear and Extensional Rheology of Linear and Branched Polybutylene Succinate Blends

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