Spherulite boundary strengthening concept for toughening polypropylene

Lustiger, A.; Marzinsky, C. N.; Mueller, R.R.

doi:10.1002/(sici)1099-0488(19980915)36:12<2047::aid-polb4>3.0.co;2-u

Cited by 47 publications

(24 citation statements)

References 4 publications

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“…There have been a considerable number of investigations to toughen PLA with the goal of balancing and increasing tensile strength, impact strength and elongation at break while retaining the biocompatible and biodegradable nature by the introduction of a rubbery phase in block copolymers and blends [3][4][5][6]. One example of toughening is to blunt the sharp tip of crack propagation [7]. Improvements can involve alteration of interface (e.g.…”

Section: Introductionsupporting

confidence: 70%

Morphological structure, thermal and mechanical properties of tough poly(lactic acid) upon stereocomplexes

Tang

Chen

et al. 2015

European Polymer Journal

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Section: Introductionsupporting

confidence: 70%

Morphological structure, thermal and mechanical properties of tough poly(lactic acid) upon stereocomplexes

Tang

Chen

et al. 2015

European Polymer Journal

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“…Indeed, the concept of distinct interspherulitic regions is then somewhat redundant, in that lamellae from adjacent spherulites form interlocking structures containing a high density of tie molecules, with electrically weaker moieties being distributed throughout the system. We do not believe that comparable mechanisms of morphological evolution have been successfully developed in propylenebased systems, the closest analogue being the work of Lustiger et al [9]. In this study, a specially designed iPP/propyleneethylene copolymer blend was chosen, in which excess copolymer at spherulite boundaries was found to co-crystallize with the iPP lamellae in such a way as to increase the effective tie molecule density, improving the balance of properties required for successful application in power cables.…”

Section: Introductionmentioning

confidence: 82%

Thermoplastic cable insulation comprising a blend of isotactic polypropylene and a propylene-ethylene copolymer

Green

Vaughan

Stevens

et al. 2015

IEEE Trans. Dielect. Electr. Insul.

136

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There is much interest in the development of replacement materials for crosslinked polyethylene (XLPE) that are both recyclable (i.e. thermoplastic) and capable of high temperature operation. Thermally, polypropylene is the ideal choice, although its stiffness and low electrical breakdown strength make for a challenging materials design problem. We report here on the compositional optimization of a propylene homopolymer/propylene-ethylene copolymer blend in terms of its dynamic mechanical properties and thin film electrical breakdown strength. The extrusion of a trial minicable using the optimized blend is also discussed, which is shown to exhibit a significantly improved electrical performance, as gauged by its DC breakdown strength, than an XLPE-insulated reference.

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“…Furthermore, since it is not meaningful to describe these space-filling spherulitic morphologies as having boundaries per se, there remains no problem with crystallization-induced specific volume changes being localized in such regions. Such effects are, for example, the origin of brittleness in isotactic polypropylene [13]. The studies described above also demonstrated the existence of a critical isothermal crystallization temperature (T c ) window of 113 -119 ˚C, outside which, no improvement in breakdown strength occurs [2].…”

Section: Introductionmentioning

confidence: 99%

Recyclable power cable comprising a blend of slow-crystallized polyethylenes

Green

Vaughan

Stevens

et al. 2013

IEEE Trans. Dielect. Electr. Insul.

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Crosslinked polyethylene (XLPE) has a successful history as a cable insulation material. Nevertheless, in recent years, as environmental awareness has grown, concerns about the ease with which it can be recycled have emerged. Although technologies have been developed for XLPE recycling, this report concentrates instead on the development of a thermoplastic alternative. Specifically, a 20 : 80 blend of high density and low density polyethylene (HDPE : LDPE) was selected and subjected to a non-isothermal crystallization procedure. It was found that, provided the cooling rate falls between 0.5 and 10 K min -1 , the blend exhibits superior breakdown strengths and high temperature mechanical stiffness compared to XLPE. A trial cable was then extruded from this blend using such a cooling rate. The breakdown behavior of the morphologically-designed cable was finally compared with that of LDPE and XLPE reference systems.

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Spherulite boundary strengthening concept for toughening polypropylene

Cited by 47 publications

References 4 publications

Morphological structure, thermal and mechanical properties of tough poly(lactic acid) upon stereocomplexes

Morphological structure, thermal and mechanical properties of tough poly(lactic acid) upon stereocomplexes

Thermoplastic cable insulation comprising a blend of isotactic polypropylene and a propylene-ethylene copolymer

Recyclable power cable comprising a blend of slow-crystallized polyethylenes

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