Microstructure–sealing performance linkage of metallocene linear low density polyethylene and low density polyethylene blends

Galgali, Girish; Kaliappan, Senthil Kumar

doi:10.1002/pcr2.10206

Cited by 3 publications

(6 citation statements)

References 37 publications

(51 reference statements)

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“…This indicates the possible presence of LCB in mLLDPE‐3. [ 12 ] Furthermore, the shear thinning behavior of LDPE‐T and LDPE‐A matches closely with each other in this shear regime despite the difference in the nature and type of LCB in the microstructure. The deformation experienced at this lower shear regime might not be large enough to distinctly differentiate the microstructure of these LDPEs.…”

Section: Resultsmentioning

confidence: 61%

“…It has been previously reported that the microstructure of mLLDPE‐3 possibly contains LCB‐type architecture. [ 11,12 ] Based on these observations, it can be inferred that mLLDPE‐3 possibly contains LDPE‐T‐like LCB architecture in its polymer chain microstructure.…”

Section: Resultsmentioning

confidence: 97%

“…The presence of additional peaks in melting curves after subjecting the samples to the SSA protocol indicated co‐crystallization, despite the SSA protocol promoting phase segregation during crystallization and annealing, as described elsewhere. [ 12 ] As the fraction of LCB containing LDPE increased in mLLDPE‐1/LDPE blends, mLLDPE‐1 and LDPE appear to crystallize concurrently and/or separately. Evidence of co‐crystallization constitutes indirect evidence of melt miscibility.…”

Section: Resultsmentioning

confidence: 99%

“…The subtle differences in the microstructure manifested by comonomer type and distribution affected the sealing performance of the LLDPE + LDPE‐T systems. [ 12 ] As discussed above the mLLDPE + LT blends are well‐reported in the literature. [ 7‐12 ] However, mLLDPE + LA binary systems are rarely reported.…”

Section: Introductionmentioning

confidence: 96%

“…[ 12 ] As discussed above the mLLDPE + LT blends are well‐reported in the literature. [ 7‐12 ] However, mLLDPE + LA binary systems are rarely reported. [ 5,13 ] Moreover, mLLDPE + LT + LA ternary systems are barely investigated.…”

Section: Introductionmentioning

confidence: 97%

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Critical insights into ethylene‐1‐alkene copolymers and long‐chain branched polyethylene microstructure on thermo‐rheological and sealing behavior of multicomponent systems

Galgali¹,

Kaliappan²,

Santis³

2023

Polymer Engineering & Sci

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The microstructure‐property relationships in multicomponent ethylene‐1‐alkene copolymers with different branching in the microstructures are demonstrated. The metallocene catalyzed linear low density polyethylene (mLLDPE), was miscible with both autoclave grade low density polyethylene (LDPE‐A) and/or tubular grade low density polyethylene (LDPE‐T). For these multicomponent systems, the rheological response was distinctly differentiating and sensitive to the microstructure of LDPE, at higher shear regimes. The thicker lamellae of LDPE‐T and/or LDPE‐A might co‐crystallize if there is a high density polyethylene‐like fraction present in the mLLDPE. Even though the macro parameters like density and melt index (MI) of the investigated multicomponent systems are comparable, the subtle differences in the microstructure manifested by type and distribution of comonomer and/or branching affected the sealing performance. Both high comonomer content and comonomer distribution in the mLLDPE matrix affording a higher fraction of material melting below 120°C were found to be critical for the heat sealing. The fraction of material melting at lower temperatures, attributed to the tertiary branches present in the hyper‐branched microstructure of LDPE‐A, participate in the sealing process, and lower the sealing temperature. It was evident that mLLDPE with asymmetric distribution of lamellae is more sensitive to the microstructure of the LDPE used.

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Section: Resultsmentioning

confidence: 61%

Section: Resultsmentioning

confidence: 97%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 97%

See 3 more Smart Citations

Critical insights into ethylene‐1‐alkene copolymers and long‐chain branched polyethylene microstructure on thermo‐rheological and sealing behavior of multicomponent systems

Galgali¹,

Kaliappan²,

Santis³

2023

Polymer Engineering & Sci

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Tearing properties, crystallization behavior, microstructure, and morphology of LLDPE with different short branched chain distributions

Ren,

Shao,

Wang

et al. 2024

International Polymer Processing

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The length and distribution of comonomers with short-chain branching (SCB) have a significant influence on the crystallization behavior and crystal structure of polymers, as well as the mechanical properties of the material. This study investigates the crystallization behavior and properties of linear low-density polyethylene (LLDPE) samples with similar density, molecular weight, and branching degree but varying SCB distributions. The results show that LLDPE with butene as the comonomer has a stronger ability to suppress crystallization compared to LLDPE with hexene as the comonomer due to its more uniform SCB distribution. Additionally, among LLDPEs with comonomers of octene, hexene, and butene, the LLDPE with the most uniform SCB distribution exhibits the weakest crystallization ability. Small-angle X-ray scattering (SAXS) and scanning electron microscopy (SEM) results indicate that LLDPE with more uniform distribution of SCB has smaller long-period and more regular lamellar structure. Therefore, LLDPE with more uniform SCB distribution exhibits weaker inhibition ability towards crystallization, leading to less agglomerated phases and weaker phase separation, resulting in higher tear strength.

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Influence of Ethylene-1-Alkene Copolymers Microstructure on Thermo-Rheological Behavior of Model Blends for Enhanced Recycling

Galgali¹,

Kaliappan²,

Pandit³

2022

Macromol

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Polyethylenes (PE) are the most commonly occurring ingredients for post-consumer recyclates (PCR). The structure–property relationships of different types of model PE-based blends are established using multiple thermo-rheological analyses. Although considered “simple”, the complex behavior of model PE-based blends is experimentally demonstrated for the first time for metallocene-catalyzed, linear, low-density polyethylenes (mLLDPE) with different microstructures that are commonly encountered in PCR. During non-isothermal crystallization, the microstructure of mLLDPE predominantly influences the interaction between mLLDPE and LDPE. Based on the mLLDPE microstructure, the molten LDPE phase acts either as a nucleating agent or as a crystallization rate promoting agent. Both rheological and thermal analyses show that higher activation energy is required for the reptation or movement of polymer chains in a highly branched microstructure with long chain branching (LCB) compared to a linear microstructure with short chain branching (SCB). The quasi-melt response, as measured by thermal analysis under non-isothermal conditions, is distinctly different and sensitive to both the SCB and LCB present in the LLDPE/LDPE blends.

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Microstructure–sealing performance linkage of metallocene linear low density polyethylene and low density polyethylene blends

Cited by 3 publications

References 37 publications

Critical insights into ethylene‐1‐alkene copolymers and long‐chain branched polyethylene microstructure on thermo‐rheological and sealing behavior of multicomponent systems

Critical insights into ethylene‐1‐alkene copolymers and long‐chain branched polyethylene microstructure on thermo‐rheological and sealing behavior of multicomponent systems

Tearing properties, crystallization behavior, microstructure, and morphology of LLDPE with different short branched chain distributions

Influence of Ethylene-1-Alkene Copolymers Microstructure on Thermo-Rheological Behavior of Model Blends for Enhanced Recycling

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