The effects of extrusion parameters and blend composition on the mechanical, rheological and thermal properties of LDPE/PS/PMMA ternary polymer blends

Ding, Yong; Abeykoon, Chamil; Perera, Yasith S.

doi:10.1016/j.aime.2021.100067

Cited by 15 publications

(15 citation statements)

References 55 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

Section: Resultsmentioning

confidence: 99%

“…The increase in viscosity, due to the cohesion of the molecules in the fluid, would also increase the surface tension. Ding et al proposed that the viscosity of polymer composites and the interfacial tension decreases with an increase in the temperature [96]. When considering our oscillation temperature sweep, the higher temperature makes the filament more liquid-like, and it should be printable when having a G" more than G'.…”

Section: Viscoelastic Properties Of Hme-and Fdm-printable Mixturesmentioning

confidence: 94%

See 1 more Smart Citation

Rheological Investigation of Hydroxypropyl Cellulose–Based Filaments for Material Extrusion 3D Printing

2022

View full text Add to dashboard Cite

The rheological properties of drug–polymer mixtures have a significant influence on their processability when using transformative techniques, such as hot-melt-extrusion and material-extrusion 3D printing; however, there has been limited data on printable systems. This study investigated the rheological properties of 17 formulations of successful printed tablets for both immediate and controlled release. Hydroxypropyl cellulose was used in various ratios to obtain printable filaments in combination with various drugs (indomethacin or theophylline), polymers and disintegrants. The complex viscosity, shear thinning behavior and viscoelastic properties were affected by the drug load, polymer composite, disintegrant type, temperature and shear rate applied. Larger windows of processing viscosity were revealed. The viscosity of the printable blends could be as low as the range 10–1000 Pa·s at 100 rad/s angular frequency. All formulations showed shear thinning behavior with a broad slope of complex viscosity from −0.28 to −0.74. The addition of 30–60% drug or disintegrant tended to have greater viscosity values. While microcrystalline cellulose was found to be an alternative additive to lower the storage and loss modulus among disintegrants. This rheological data could be useful for the preformulation and further development of material-extrusion 3D-printing medicines.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Viscoelastic Properties Of Hme-and Fdm-printable Mixturesmentioning

confidence: 94%

Rheological Investigation of Hydroxypropyl Cellulose–Based Filaments for Material Extrusion 3D Printing

2022

View full text Add to dashboard Cite

show abstract

“…Changes in weight molar masses and crystallinity on dumb-bell (s and x were obtained using Eqs. ( 4) and (5) for the skin layer in the 240 °C -4 min sample are less defined than the ones measured at 300 μm for the sample molded in the same condition. It could mean distance between diffracted planes is less regular leading to less perfect crystals.…”

Section: Tablementioning

confidence: 58%

“…It is well accepted that mechanical properties of resulting materials depend on the processing conditions (melt temperature [ 2 , 3 ], mold temperature [3] , cooling time [4] . In the case of injection molding, barrel temperature and screw speed in the case of extrusion [5] ). Many previous papers report the effect of the processing conditions and of the processing induced morphology on mechanical properties of glass fibers PBT [6][7][8] .…”

Section: Introductionmentioning

confidence: 99%

Embrittlement of polybutylene terephthalate induced by injection molding

Loyer

Ferreira

Marijon

et al. 2022

Polymer Degradation and Stability

View full text Add to dashboard Cite

“…The optimization of material stability is regularly achieved in several ways: preparation of hybrids [ 1 , 2 ], multicomponent blending [ 3 , 4 , 5 ], crosslinking [ 6 , 7 ], the addition of stabilizers [ 8 , 9 ], radiation processing [ 10 , 11 ] or any of their combinations. In the processing of plastics, an important role for further material stability is played by the technological parameters that influence the oxidation state and the history of products.…”

Section: Introductionmentioning

confidence: 99%

Stability Study of the Irradiated Poly(lactic acid)/Styrene Isoprene Styrene Reinforced with Silica Nanoparticles

Lupu

Mariș

Zaharescu³

et al. 2022

Materials

View full text Add to dashboard Cite

In this paper, the stability improvement of poly(lactic acid) (PLA)/styrene-isoprene block copolymer (SIS) loaded with silica nanoparticles is characterized. The protection efficiency in the material of thermal stability is mainly studied by means of high accurate isothermal and nonisothermal chemiluminescence procedures. The oxidation induction times obtained in the isothermal CL determinations increase from 45 min to 312 min as the polymer is free of silica or the filler loading is about 10%, respectively. The nonisothermal measurements reveal the values of onset oxidation temperatures with about 15% when the concentration of SiO2 particles is enhanced from none to 10%. The curing assay and Charlesby–Pinner representation as well as the modifications that occurred in the FTIR carbonyl band at 1745 cm−1 are appropriate proofs for the delay of oxidation in hybrid samples. The improved efficiency of silica during the accelerated degradation of PLA/SIS 30/n-SiO2 composites is demonstrated by means of the increased values of activation energy in correlation with the augmentation of silica loading. While the pristine material is modified by the addition of 10% silica nanoparticles, the activation energy grows from 55 kJ mol−1 to 74 kJ mol−1 for nonirradiated samples and from 47 kJ mol−1 to 76 kJ mol−1 for γ-processed material at 25 kGy. The stabilizer features are associated with silica nanoparticles due to the protection of fragments generated by the scission of hydrocarbon structure of SIS, the minor component, whose degradation fragments are early converted into hydroperoxides rather than influencing depolymerization in the PLA phase. The reduction of the transmission values concerning the growing reinforcement is evidence of the capacity of SiO2 to minimize the changes in polymers subjected to high energy sterilization. The silica loading of 10 wt% may be considered a proper solution for attaining an extended lifespan under the accelerated degradation caused by the intense transfer of energy, such as radiation processing on the polymer hybrid.

show abstract

The effects of extrusion parameters and blend composition on the mechanical, rheological and thermal properties of LDPE/PS/PMMA ternary polymer blends

Cited by 15 publications

References 55 publications

Rheological Investigation of Hydroxypropyl Cellulose–Based Filaments for Material Extrusion 3D Printing

Rheological Investigation of Hydroxypropyl Cellulose–Based Filaments for Material Extrusion 3D Printing

Embrittlement of polybutylene terephthalate induced by injection molding

Stability Study of the Irradiated Poly(lactic acid)/Styrene Isoprene Styrene Reinforced with Silica Nanoparticles

Contact Info

Product

Resources

About