Rheological properties of branched low‐density polyethylene

Han, Chang Dae; Kim, Yong Joo; Chuang, Hsiao-Ken; Kwack, Tae Hoon

doi:10.1002/app.1983.070281110

Cited by 26 publications

(20 citation statements)

References 17 publications

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“…In addition, low molecular weight polymer added into the incompatible blend as a compatibilizer causes the viscosities of blend to be decreased because the polymer roles as a plasticizer. Han et al 29,30 also reported a high melt viscosity of compatibilized blends. In this study, however, the viscosities of ternary blends gradually decrease with increase in the compatibilzer content.…”

Section: Rheological Propertiesmentioning

confidence: 92%

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Effect of Poly(esterimide)s as Compatibilizers on the Physical Properties of Poly(etherimide)/Thermotropic Liquid Crystalline Polymer in-situ Composites

Hong

Gil

Hwang

et al. 2004

Polym J

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ABSTRACT:This study investigates the compatibilizing effect of poly(esterimide) (PEsI) on the blend of poly-(etherimide) (Ultem 1000; Ultem from General Electric Company) and thermotropic liquid crystalline polyesteramide (Vectra B950; Vectra B from Hoechst Celanese). Two types of polyesterimide (PEsI) were prepared as compatibilizers to improve the interfacial adhesion of incompatible Ultem and Vectra B. Poly(ethyleneterephthalate) (PET) based PEsI (EI10) and poly(butyleneterephthalate) (PBT) based PEsI (BI10) including 10 mol% of the imide are prepared. The binary Vectra B/PEsI and Ultem/PEsI blends were investigated in terms of thermal properties. This revealed that EI10 is more reactive (or compatible) with Vectra B, whereas BI10 is more compatible with Ultem. The effect of compatibilizer structures on the ternary Ultem/Vectra B/PEsI blends was also studied by thermal behavior, rheological properties, and mechanical properties. These results showed that BI10, more compatible with Ultem matrix, acts as a better compatibilizer in a ternary Ultem/Vectra B/PEsI blend system than EI10, more compatible with Vectra B phase. The optimum level of the compatibilzers turned out to be about 1-2 wt% for the blend systems.KEY WORDS Polyesterimide / Interfacial Adhesion / Liquid Crystalline Polyesteramide / Polyetherimide / Compatibilizer / In recent years polymer blends in which a thermotropic liquid crystalline polymer (TLCP) dispersed in a thermoplastic matrix, so called the in-situ composite, have frequently been studied to exploit the excellent mechanical properties of the TLCP such as high tensile strength/modulus, low thermal expansion coefficient, low dielectric properties, and low moisture pick-up.1-5 Furthermore, physical properties such as thermomechanical properties, transient viscosity, crystallization behavior, morphology, and rheological properties of TLCP/isotropic polymer blends have been lively investigated. 6,7 TLCP molecules can easily line up during shearing, thereby they reduce the resistance to flow. If a spinning process is performed, moreover, the oriented fibrillar species can be obtained in the solid state due to the long relaxation time of TLCP chains. 5,8,9 In-situ composites can be produced by melt blending of two components in twin screw extruder or static mixer, followed by elongation. TLCP phases are usually deformed into microfibrils along the flow direction, and the matrix can be reinforced. In most cases, however, dispersed TLCP domain and thermoplastic matrix are immiscible. Thus, their in-situ composites show limited mechanical properties resulting from weak interfaces.To obtain enhanced physical properties of the insitu composites, improved compatibility between the matrix polymer and the reinforcing TLCP has been required. [10][11][12] It is well known that the compatibilization is a decisive factor to overcome the problems of poor dispersion and poor interfacial adhesion in the incompatible polymer blends resulting in melt flow instabilities and weak physical properties. To improve ...

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Section: Rheological Propertiesmentioning

confidence: 92%

“…[30][31][32] However, these structures are deformed by elongational shear flow, composition, viscosity ratio, the degree of orientation, and so on. Figure 9 and Figure 10 show the tensile fractured surfaces of ternary Ultem/Vectra B/EI10 blend fibers and Ultem/Vectra B/BI10 blend fibers at the draw ratio of 4, respectively.…”

Section: Morphologymentioning

confidence: 99%

Effect of Poly(esterimide)s as Compatibilizers on the Physical Properties of Poly(etherimide)/Thermotropic Liquid Crystalline Polymer in-situ Composites

Hong

Gil

Hwang

et al. 2004

Polym J

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“…The experimental techniques employed are the same as those described in Paper I of this series. 7 The tubular film blowing experiment was conducted, using the apparatus described in Paper I of this ~e r i e s .~ The details of the experimental procedure employed are also described in the same paper.…”

Section: Methodsmentioning

confidence: 99%

Rheology‐processing‐property relationships in tubular blown film extrusion. II. Low‐pressure low‐density polyethylene

Kwack

Han

1983

J of Applied Polymer Sci

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SynopsisAn experimental investigation was undertaken to establish rheology-processing-property relationships in the tubular blown film extrusion of low-pressure low-density polyethylene (LP-LDPE). For the study, three commercial LP-LDPE resins, each from a different resin manufacturer, were used in producing tubular films, by employing the apparatus described in Paper I of this series. Both molecular and rheological characterizations of the resins were conducted, enabling us to interpret the tubular film blowing characteristics of the resins. Correlations were obtained between the processing variables (namely, blowup and takeup ratios) and the tensile properties of the films. The tubular film blowing characteristics of LP-LDPE and HP-LDPE resins are compared. Differences in the rbeological properties (namely, elongational viscosity) of the two types of resin are used in explaining the experimentally observed differences in their tubular film blowability.

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“…(10). A comparison of the calculated + p2x + p3x2)e-B4xl (12) and measured gauges for LLDPE is given in Figure FIGURE 5 LLDPE gauge profile comparison.…”

Section: Deformational History Of Lldpeildpe Blendsmentioning

confidence: 99%

Deformational history of LLDPE/LDPE blends on blown film equipment

Huang

Campbell

1985

Adv Polym Technol

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A video camera tracer technique (T. A. Huangand G. A. Campbell, paper Although literature results on film blowing deformation are available, '-I6 most of the work was conducted on a small line where throughput and cooling rates are limited. Recently, we initiated a research program aimed toward a fundamental understanding of the process. The effect of extrusion variables upon stretching and cooling histories for LDPE and LLDPE is discussed elsewhere. *' DEFORMATIONAL, HISTORY OF LLDPEILDPE BLENDSFor LLDPE/LDPE blends, data of deformational history on the blown film equipment are not available in the literature. Recently, it became a plastics industry practice to add small amounts of LDPE into LLDPE for stabilization of the bubble and for improvement of LLDPE film opticals. Also, the addition of small amounts of LLDPE into LDPE reduces bubble breaks and improves drawdown characteristics. The purpose of this work is to quantify the changes in strain and strain rate histories caused by these additions of resin types. INTRODUCTIONMATERIAL DATA Blown film technology has been practiced in industry for many years. It is generally recognized that stretching and cooling histories experienced by the fluid element between die and frost line have an important effect on determining final film properties.

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Rheological properties of branched low‐density polyethylene

Cited by 26 publications

References 17 publications

Effect of Poly(esterimide)s as Compatibilizers on the Physical Properties of Poly(etherimide)/Thermotropic Liquid Crystalline Polymer in-situ Composites

Effect of Poly(esterimide)s as Compatibilizers on the Physical Properties of Poly(etherimide)/Thermotropic Liquid Crystalline Polymer in-situ Composites

Rheology‐processing‐property relationships in tubular blown film extrusion. II. Low‐pressure low‐density polyethylene

Deformational history of LLDPE/LDPE blends on blown film equipment

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