Differential Scanning Calorimetry as a Tool for Quality Testing of Plastics

Bĕhálek, Luboš

doi:10.4028/www.scientific.net/kem.669.485

Cited by 3 publications

(1 citation statement)

References 9 publications

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“…[63,64] Solid glass microspheres, for example, have a high density of about 2.5 g cm −3 . [65] Hollow glass microspheres have densities as low as 0.46 g cm −3 , [66] but are relatively expensive. Other spherical fillers such as calcium carbonate and microcrystalline cellulose are either chemically or thermally unstable.…”

Section: Introductionmentioning

confidence: 99%

Shrinkage and Warpage Optimization of Expanded‐Perlite‐Filled Polypropylene Composites in Extrusion‐Based Additive Manufacturing

Spoerk

Sapkota

Weingrill

et al. 2017

Macro Materials & Eng

133

144

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A major challenge in extrusion‐based additive manufacturing is the lack of commercially available materials compared to those in well‐established processes like injection molding or extrusion. This study aims at expanding the material database by evaluating the feasibility of polypropylene, which is one of the most common and technologically relevant semicrystalline polymers. Expanded‐perlite‐filled polypropylene and ternary blends with amorphous polyolefins are evaluated to establish an understanding of their processability and their printability. A detailed study on the shrinkage behavior, as well as on the thermal, mechanical, morphological, and warpage properties is performed. It is found that smaller sized fillers result in a tremendous warpage and shrinkage reduction and concurrently improved mechanical properties than compounds filled with bigger sized fillers. Based on the optimal properties profile, a ternary blend that can overcome the shrinkage and warpage of printed parts is suggested.

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Section: Introductionmentioning

confidence: 99%

Shrinkage and Warpage Optimization of Expanded‐Perlite‐Filled Polypropylene Composites in Extrusion‐Based Additive Manufacturing

Spoerk

Sapkota

Weingrill

et al. 2017

Macro Materials & Eng

133

144

View full text Add to dashboard Cite

show abstract

Green Polymers: Overview, Characterizations, and Biomedical Applications

Richi,

Saib,

Ali

et al. 2024

Reference Module in Materials Science and Materials Engineering

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Possibility to Detect Degraded Recycled Material in the Moulded Parts From Pp

Bĕhálek¹,

Seidl²,

Habr³

2016

MM SJ

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In the frame of injection moulding production process not all raw material creates the final products and a waste material is generated (defective and rejected products, cold runners, etc.). This technological waste is very often reused in production, which reduces the final production costs, however, this regrind or regranulated material affects the final properties of the part. The negative impact of recycled material presence depends on the degree of chain cleavage of the polymer macromolecules caused by high temperature load. The deterioration of the product end-use properties does not have to be demonstrated immediately (or in a short time period) after the removal of the part from injection mould. However, the product service life can be dramatically reduced which is simulated in the technical practice as exposure of the product to elevated temperature for prolonged time periods. This paper is focused on experimental methods for detection of heat-damaged recycled material incorporated to the non-filled moulded parts made of polypropylene. For the purpose of the analyses the multipurpose test specimens type A (specified by ISO 3167 standard) were prepared under the conditions defined in ISO 1873-2 and ISO 294-1 standard (melt temperature, mould temperature, injection rate, holding time, cycle time, etc.). Subsequently, the melt was overheated within the injection unit which caused the heat-induced macromolecule cleavage. This material was used for production another specimens that were then grinded and added to the original (virgin) raw material in the wide range of concentrations (from 10 to 100 wt%). These final specimens were analyzed using the physical methods modified for engineering practice to determine morphological, rheological, thermal and physical-mechanical properties of the moulded parts.

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Differential Scanning Calorimetry as a Tool for Quality Testing of Plastics

Cited by 3 publications

References 9 publications

Shrinkage and Warpage Optimization of Expanded‐Perlite‐Filled Polypropylene Composites in Extrusion‐Based Additive Manufacturing

Shrinkage and Warpage Optimization of Expanded‐Perlite‐Filled Polypropylene Composites in Extrusion‐Based Additive Manufacturing

Green Polymers: Overview, Characterizations, and Biomedical Applications

Possibility to Detect Degraded Recycled Material in the Moulded Parts From Pp

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