Low-Temperature Mechanical Properties of High-Density and Low-Density Polyethylene and Their Blends | Sciact - CRIS-system of Boreskov Institute of Catalysis

Low-Temperature Mechanical Properties of High-Density and Low-Density Polyethylene and Their Blends Full article

Journal

Polymers
, E-ISSN: 2073-4360

Output data

Year: 2021, Volume: 13, Number: 11, Article number : 1821, Pages count : 21 DOI: 10.3390/polym13111821

Tags

polyethylene; blends; low-temperature characteristics; mechanical properties; molecular structure

Authors

Salakhov Ildar I. ¹ , Shaidullin Nadim M. ¹ , Chalykh Anatoly E. ² , Matsko Mikhail A. ³ , Shapagin Alexey V. ² , Batyrshin Ayrat Z. ¹ , Shandryuk Georgiy A. ⁴ , Nifant’ev Ilya E. ⁴

Affiliations

1	R&D Center PJSC Nizhnekamskneftekhim, Nizhnekamsk, Sobolekovskaya Str. 23, 423574 Republic of Tatarstan, Russia
2	Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences (IPCE RAS), Leninskiy Prospekt 31, 119071 Moscow, Russia
3	Boreskov Institute of Catalysis Siberian Branch of the Russian Academy of Sciences, Acad. Lavrentiev Prospect 5, 630090 Novosibirsk, Russia
4	A.V. Topchiev Institute of Petrochemical Synthesis of Russian Academy of Sciences (TIPS RAS), Leninskii pr. 29, 119991 Moscow, Russia

Funding (3)

1	Ministry of Science and Higher Education of the Russian Federation	0239-2021-0004
2	Russian Science Foundation	21-73-30010
3	Ministry of Science and Higher Education of the Russian Federation	0081-2019-0019

Low-temperature properties of high-density polyethylene (HDPE), low-density polyethylene (LDPE), linear low-density polyethylene (LLDPE), and their blends were studied. The analyzed low-temperature mechanical properties involve the deformation resistance and impact strength characteristics. HDPE is a bimodal ethylene/1-hexene copolymer; LDPE is a branched ethylene homopolymer containing short-chain branches of different length; LLDPE is a binary ethylene/1-butene copolymer and an ethylene/1-butene/1-hexene terpolymer. The samples of copolymers and their blends were studied by gel permeation chromatography (GPC), differential scanning calorimetry (DSC), 13C NMR spectroscopy, and dynamic mechanical analysis (DMA) using testing machines equipped with a cryochamber. It is proposed that such parameters as “relative elongation at break at −45 °C” and “Izod impact strength at −40 °C” are used instead of the ductile-to-brittle transition temperature to assess frost resistance properties because these parameters are more sensitive to deformation and impact at subzero temperatures for HDPE. LLDPE is shown to exhibit higher relative elongation at break at −45 °C and Izod impact strength at −20 ÷ 60 °C compared to those of LDPE. LLDPE terpolymer added to HDPE (at a content ≥ 25 wt.%) simultaneously increases flow properties and improves tensile properties of the blend at −45 °C. Changes in low-temperature properties as a function of molecular weight, MWD, crystallinity, and branch content were determined for HDPE, LLDPE, and their blends. The DMA data prove the resulting dependences. The reported findings allow one to understand and predict mechanical properties in the HDPE–LLDPE systems at subzero temperatures.

Salakhov I.I. , Shaidullin N.M. , Chalykh A.E. , Matsko M.A. , Shapagin A.V. , Batyrshin A.Z. , Shandryuk G.A. , Nifant’ev I.E.
Low-Temperature Mechanical Properties of High-Density and Low-Density Polyethylene and Their Blends

Polymers. 2021. V.13. N11. 1821 :1-21. DOI: 10.3390/polym13111821 WOS Scopus РИНЦ AN PMID OpenAlex

Full text from publisher

Submitted:	Apr 25, 2021
Accepted:	May 28, 2021
Published online:	May 31, 2021
Published print:	Jun 1, 2021

Web of science:	WOS:000660509400001
Scopus:	2-s2.0-85107911773
Elibrary:	46856269
Chemical Abstracts:	2021:1454233
PMID:	34072928
OpenAlex:	W3164138952

DB	Citing
Web of science	34
Scopus	36
Elibrary	27
OpenAlex	37