Rheological properties of high-density polyethylene/linear low-density polyethylene and high-density polyethylene/low-density polyethylene blends

Agrawal, Pankaj; Silva, Milena H. A.; Cavalcanti, Shirley N.; Freitas, Daniel M. G.; Araújo, Jeane P. de; Oliveira, Akidauana D. B.; Mélo, Tomás Jefférson Alves de

doi:10.1007/s00289-021-03635-8

Cited by 34 publications

(33 citation statements)

References 50 publications

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“…An alternative to tailor and expand the range of applications of polymeric materials is through the physical mixture of polymers (polymer blends) 1 . This is one of the main strategies applied by the polymer industry to develop new polymeric materials with differentiated and improved properties compared to pure polymers 2–4 . Moreover, polymer blends are economically viable given the lower production costs when compared to the synthesis of new polymers 5 …”

Section: Introductionmentioning

confidence: 99%

Evaluation of the SEBS copolymer in the compatibility of PP/ABS blends through mechanical, thermal, thermomechanical properties, and morphology

Luna

Siqueira

Araújo

et al. 2021

Polymers for Advanced Techs

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Polypropylene (PP) blends with acrylonitrile‐butadiene‐styrene (ABS) were prepared using the styrene‐ethylene‐butylene‐styrene copolymer (SEBS) as a compatibilizing agent. The blends were prepared in a co‐rotational twin‐screw extruder and injection molded. Torque rheometry, Izod impact strength, tensile strength, heat deflection temperature (HDT), differential scanning calorimetry, thermogravimetry, and scanning electron microscopy properties were investigated. The results showed that there was an increase in the torque of PA6/ABS blends with SEBS addition. The PP/ABS/SEBS (60/25/15%) blend showed significant improvement in impact strength, elongation at break, thermal stability, and HDT compared with neat PP. The elastic modulus and tensile strength have not been significantly reduced. The degree of crystallinity and the crystalline melting temperature increased, indicating a nucleating effect of ABS. The PP/ABS blends compatibilized with 12.5% and 15% SEBS presented morphology with well‐distributed fine ABS particles with good interfacial adhesion. As a result, thermal stability has been improved over pure PP and the mechanical properties have been increased, especially impact strength. In general, the addition of the SEBS copolymer as the PP/ABS blend compatibilizer has the advantage of refining the blend's morphology, increasing its toughness and thermal stability, without jeopardizing other PP properties.

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Section: Introductionmentioning

confidence: 99%

Evaluation of the SEBS copolymer in the compatibility of PP/ABS blends through mechanical, thermal, thermomechanical properties, and morphology

Luna

Siqueira

Araújo

et al. 2021

Polymers for Advanced Techs

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show abstract

“…Based on fundamental polymer rheology theories, lower crossover frequency can be indicative of higher molecular weight and/or higher branching content, and lower crossover modulus can indicate a broader molecular weight distribution and/or branched structure. [ 44,48,50 ] The rheology results not only confirm the decrosslinking events in SSSP‐processed XLLDPEs, but also reveal additional independent changes in their molecular architectures.…”

Section: Resultsmentioning

confidence: 60%

“…Generally, the torque profile of polyolefins in a batch mixer starts at a higher value as solid specimens entering the mixer interact with the rotating blades and eventually levels off to a lower value plateau within several minutes. [ 50 ] The curves in Figure 8 gradually decline toward a plateau over 20–30 min because long‐chain‐branched (and crosslinked) LDPE molecules require an extended melt‐mixing time to reach an equilibrium, homogeneous phase at 190°C.…”

Section: Resultsmentioning

confidence: 99%

Mechanochemical modification of crosslinked low‐density polyethylene: Effect of solid‐state shear pulverization on crosslinks, branches, and chain lengths

2022

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Crosslinked low-density polyethylene (XLLDPE) is widely used in several specialty plastics industries. However, the permanent chemical crosslinks cause high-melt viscosity and poor processability, preventing the material from being reused and recycled effectively. This study investigates solid-state shear pulverization (SSSP) as a continuous, commercially viable mechanochemical processing technique to initiate the decrosslinking of XLLDPE for mechanical recycling. Post-industrial XLLDPE scrap material was processed using SSSP with a range of pulverization conditions, which were correlated with universal processing covariants of specific mechanical energy and particle size distribution.

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“…On the contrary to the case of E a , no studies about the effect of microstructure on the melt elasticity in the linear viscoelastic regime (in terms of the elastic modulus, G ′, or phase angle δ ) have been published. Indeed, there is abundant literature on the effect of molecular weight, polydispersity, and long-chain branching of homopolymers [ 33 , 34 , 35 , 39 , 40 , 46 , 47 , 48 , 49 , 50 ], as well on the effect of interfaces in block copolymers and immiscible blends [ 51 , 52 , 53 , 54 , 55 , 56 , 57 , 58 ], but the literature about the effect of the chemical structure of the monomer on melt elasticity of polymers is inexistent. As stated above, it is known that broadening the molecular weight distribution leads to an increase of the melt elasticity (phase angle δ reduction), but this cannot be the reason of the δ minimum because combining the data of Table 1 and the results of Figure 6 no correlation between the corresponding values of P.I.…”

Section: Resultsmentioning

confidence: 99%

Rheology and Tack Properties of Biodegradable Isodimorphic Poly(butylene succinate)-Ran-Poly(ε-caprolactone) Random Copolyesters and Their Potential Use as Adhesives

et al. 2022

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The sole effect of the microstructure of biodegradable isodimorphic poly(butylene succinate)-ran-poly(e-caprolactone) random copolyesters on their rheological properties is investigated. To avoid the effect of molecular weight and temperature, two rheological procedures are considered: the activation energy of flow, Ea, and the phase angle versus complex modulus plots. An unexpected variation of both parameters with copolyester composition is observed, with respective maximum and minimum values for the 50/50 composition. This might be due to the peculiar chain configurations of the copolymers that vary as a function of comonomer distribution within the chains. The same chain configuration variations are responsible for the isodimorphic character of the copolymers in the crystalline state. Tack tests, performed to study the viability of the copolyesters as environmentally friendly hot melt adhesives (HMA), reveal a correlation with rheological results. Tackiness parameters, particularly the energy of adhesion obtained from stress-strain curves during debonding experiments, are enhanced as melt elasticity increases. Based on the carried-out analysis, the link microstructure-rheology-tackiness is established, allowing selecting the best performing HMA sample considering the polymer chemistry of the system.

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Rheological properties of high-density polyethylene/linear low-density polyethylene and high-density polyethylene/low-density polyethylene blends

Cited by 34 publications

References 50 publications

Evaluation of the SEBS copolymer in the compatibility of PP/ABS blends through mechanical, thermal, thermomechanical properties, and morphology

Evaluation of the SEBS copolymer in the compatibility of PP/ABS blends through mechanical, thermal, thermomechanical properties, and morphology

Mechanochemical modification of crosslinked low‐density polyethylene: Effect of solid‐state shear pulverization on crosslinks, branches, and chain lengths

Rheology and Tack Properties of Biodegradable Isodimorphic Poly(butylene succinate)-Ran-Poly(ε-caprolactone) Random Copolyesters and Their Potential Use as Adhesives

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