The Influence of Short Chain Branch on the Crystal Characteristics and Breakdown Strength of Low-Density Polyethylene

Jiang, Liuhao; Wang, Shihang; Yang, Liuqing; Li, Shengtao; Feng, Yujun; Bai, Ya Mei

doi:10.1109/tdei.2021.009529

Cited by 7 publications

(2 citation statements)

References 23 publications

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“…This behavior is different in isomorphic copolymers, such as PBSF, where identical T s can be used for preparing single crystals independent of the composition . Similar situations were encountered in branched polyethylene and poly(ethylene- ran -carbon monoxide) (PE- ran -CO) copolymers, but in those copolymer systems characterized by total comonomer exclusion, less than 10% comonomer content could greatly decrease the T s . , …”

Section: Resultsmentioning

confidence: 99%

Comonomer Inclusion in Single Crystals of Isodimorphic Random Copolymers of Butylene Succinate and ε-Caprolactone

Safari

Zhou

et al. 2023

Macromolecules

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Random copolymers exhibit diverse crystallization behavior depending on whether comonomers are excluded or included in the crystalline phase. To understand the crystallization behavior of crystallizable isodimorphic random copolymer, in this work, we selected poly[(butylene succinate)-ran-(ε-caprolactone)], BS x CL y , copolyesters and studied their single crystal structure and morphology. The single crystals of PBS homopolymer and BS-rich copolymers were prepared by the self-seeding method in o-dichlorobenzene. The prepared single crystals were characterized by atomic force microscopy (AFM) and transmission electron microscopy. The suitable seeding temperature and the dissolution temperature of the copolymers decreased with the comonomer content. The morphological features, including size, shape, layer number, and thickness, of the single crystals depend on the seeding temperature, crystallization temperature, and, most interestingly, the composition. The size of the single crystals increased with the seeding temperature, while the aspect ratio increased with the crystallization temperature. Higher CL content in the copolymers contributed to multilayered crystals and curved edges. These characteristics were explained by the difference in growth rate and the number of dislocations, both of which are expected to be influenced by the comonomers. As revealed by AFM, the thickness of the single crystals increased with CL contents, which is the opposite of what has been reported for copolymers with high degree of comonomer exclusion. Electron diffraction of the single crystals showed smaller lattice expansion as compared to melt crystallized samples, indicating a lower degree of comonomer inclusion of CL units.

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Section: Resultsmentioning

confidence: 99%

Comonomer Inclusion in Single Crystals of Isodimorphic Random Copolymers of Butylene Succinate and ε-Caprolactone

Safari

Zhou

et al. 2023

Macromolecules

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show abstract

“…According to reports, the short-chain branch (SCB) mainly affects the crystallization and mechanical properties of LDPE, and its content is proportional to the grain size of (110) lattice plane, while the long-chain branch (LCB) mainly affects the rheology and melt viscosity of LDPE. [30][31][32] Combined with the subsequent analysis results, it can be inferred that the degree of influence of silane cross-linking on SCB and LCB is different.…”

Section: Crystalline Study Of Sxlpementioning

confidence: 98%

Characterization of shape memory silane cross‐linked low‐density polyethylene prepared by solid‐phase grafting process

Chen

Zhou

et al. 2022

J of Applied Polymer Sci

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Silane cross-linking is a conventional process to improve the properties of polyethylene, and the most common process is completed by two-step methods including melt grafting and hydrolytic cross-linking. In this work, silane crosslinked low-density polyethylene (SXLPE) was prepared via solid-phase grafting copolymerization for the grafting of vinyl trimethoxysilane (VTMS) onto low-density polyethylene (LDPE). The grafting efficiency and cross-linking efficiency were determined by infrared analysis and gel content measurement, and the properties of the materials were evaluated by differential scanning calorimetry (DSC), X-ray diffraction (XRD) studies, thermogravimetric analysis (TGA), mechanical performance test, and shape memory behavior characterization. As the benzoyl peroxide (BPO) content changes from 0.1 to 0.5 phr, the SXLPEs exhibit an increase of cross-linking degree determined by gel content, a slight decrease of crystallinity, an improvement of thermal stability, and enhancement of elastic modulus, and more chain entanglement. The solid-phase grafting copolymerization retains substantial crystal regions of LDPE, which makes it show good shape memory properties, reaching 95% shape fixity ratio and 87% shape recovery ratio.

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Effect of Low Molecular Weight Part of LDPE on DC Conductivity of XLPE

Sui,

Liu,

et al. 2024

2024 IEEE 5th International Conference on Dielectrics (ICD)

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The Influence of Short Chain Branch on the Crystal Characteristics and Breakdown Strength of Low-Density Polyethylene

Cited by 7 publications

References 23 publications

Comonomer Inclusion in Single Crystals of Isodimorphic Random Copolymers of Butylene Succinate and ε-Caprolactone

Comonomer Inclusion in Single Crystals of Isodimorphic Random Copolymers of Butylene Succinate and ε-Caprolactone

Characterization of shape memory silane cross‐linked low‐density polyethylene prepared by solid‐phase grafting process

Effect of Low Molecular Weight Part of LDPE on DC Conductivity of XLPE

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