The effect of a coupling agent on the viscoelastic properties and internal stresses in high density polyethylene filled with glass spheres

Ek, C. G.; Kubát, J.; Maurer, Frans H.J.; Rigdahl, Mikael

doi:10.1007/bf01333849

Cited by 9 publications

(21 citation statements)

References 13 publications

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“…The surface treatments of CaCO3 and the glass fibres did increase the internal stress level and reduced correspondingly the creep rate of the composites. These improvements are, however, less pronounced than those reported in [19] where covalent bonding between HDPE and glass spheres was accomplished by means of an azide functional alkoxysilane. This would indicate that the improvements reported here are mainly due to an increase in interaction forces of the van der Waals type.…”

Section: Introductioncontrasting

confidence: 68%

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Correlation between interfacial interactions and internal stresses in filled high density polyethylene

1988

Rheol Acta

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Abstract:The stress relaxation and the creep behaviour of high density polyethylene (HDPE) filled with glass fibres, clay (plate-like particles) or CaCO 3 (particles with irregular shape) were measured in uniaxial extension at room temperature. It was observed that the addition of filler increased the ir~ternal stress level, as evaluated from stress relaxation data. This increase was larger than the corresponding increase in the (short-term) elastic modulus. This behaviour may be attributed to a reduced macromolecular mobility in the matrix material close to the filler surface, i.e. to formation of an interphase region in the HDPE-matrix. From the internal stress values, the thickness of this interphase region around each filler particle was estimated, assuming a uniform coverage of the particles. It was suggested that the amount of matrix material with reduced mobility (or the thickness of the interphase region) reflected the degree of adhesion between the filler and HDPE. The change in the internal stress level due to the incorporation of different fillers, which were surface treated in some cases, was also consistent with the observed creep behaviour.

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Section: Introductioncontrasting

confidence: 68%

“…Table 1 shows the initial tensile modulus for all composites examined. In general, the improvement in adhesion between filler and matrix does not affect the initial modulus [19,25]. No significant variations in the modulus are observed between untreated and surface treated fillers in the present investigation.…”

Section: Sample Preparationcontrasting

confidence: 59%

Correlation between interfacial interactions and internal stresses in filled high density polyethylene

1988

Rheol Acta

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“…Figure 7 shows how the amplitude affects the exponents n in eq. (8). First, it should be noted that a t the strain levels discussed here there is a marked difference in n values between the composites even a t room temperature.…”

Section: The Effect Of the Strain Amplitude On The Dynamic-mechanicalmentioning

confidence: 93%

Characterization of interfacial interactions in high density polyethylene filled with glass spheres using dynamic‐mechanical analysis

Kubát

Rigdahl

Welander

1990

J of Applied Polymer Sci

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194

147

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SynopsisThe dynamic-mechanical properties of high density polyethylene filled with 20% by volume of untreated glass spheres or glass spheres treated with a silane-based coupling agent were studied as a function of temperature and imposed tensile deformation. The coupling agent used is capable of providing covalent bonding between the polymeric matrix and the glass spheres. It is assumed that an interphase region is formed in the matrix around each filler particle with properties depending on the surface treatment of the filler, but different to that of the bulk matrix. It is shown how the mechanical loss factor can be used to characterize the properties of the interphase region and the degree of adhesion between the two phases, as affected by the surface treatment. We suggest that these kinds of measurements can be valuable when determining the effectiveness of various surface treatments of filler particles from a mechanical point of view.

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“…7 Covalent bonding between HDPE and glass spheres with a silane-coupling agent has been shown to have a significant influence on the stress/strain behavior and creep properties of these composites at room temperature. 22 As glass is added, the modulus drops, but increases again as coupling agent is added. Creep behavior drops dramatically when a silane-coupling agent is present.…”

Section: Results Of Extrusion Studiesmentioning

confidence: 98%

Bifunctional coupling agents for improved mechanical properties in fiberglass/polyethylene composites

Dyke

Gnatowski²,

Burczyk³

2002

J of Applied Polymer Sci

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Two bifunctional compounds, 12-azido-1-diazo-2-dodecanone (A) and 1-diazo-17-octadecene-2-one (B), show an ability to act as coupling agents in fiberglass/ polyethylene composites. Under appropriate conditions the diazoketone functional groups in both A and B react with hydroxyl groups on a fiberglass surface, whereas the azide group in A and the alkene group in B form bonds with the plastic matrix during processing. FTIR and NMR spectroscopy were used to study the decomposition of each of these compounds under heat and UV light. Each treatment resulted in a relatively fast decomposition of the diazoketone functional group, along with a slower reaction of the azide and alkene groups. Thus it was possible to react the diazoketone end of these compounds with a fiberglass surface, without affecting the azide or alkene functional groups on the other ends of the molecules. In samples of treated fiberglass containing compounds A or B and mixed by extrusion with polyethylene, the mechanical properties of the composites had improved properties over composites containing untreated samples of fiberglass. With A as the coupling agent, both the tensile properties and Izod impact showed changes that indicated that a bifunctional bridge was formed between the fiberglass and polyethylene phases.

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The effect of a coupling agent on the viscoelastic properties and internal stresses in high density polyethylene filled with glass spheres

Cited by 9 publications

References 13 publications

Correlation between interfacial interactions and internal stresses in filled high density polyethylene

Correlation between interfacial interactions and internal stresses in filled high density polyethylene

Characterization of interfacial interactions in high density polyethylene filled with glass spheres using dynamic‐mechanical analysis

Bifunctional coupling agents for improved mechanical properties in fiberglass/polyethylene composites

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