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Salakhov II, Chalykh AE, Shaidullin NM, Shapagin AV, Budylin NY, Khasbiullin RR, Nifant’ev IE, Gerasimov VK. Phase Equilibria and Interdiffusion in Bimodal High-Density Polyethylene (HDPE) and Linear Low-Density Polyethylene (LLDPE) Based Compositions. Polymers (Basel) 2021; 13:polym13050811. [PMID: 33800874 PMCID: PMC7961435 DOI: 10.3390/polym13050811] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2021] [Revised: 03/02/2021] [Accepted: 03/02/2021] [Indexed: 11/18/2022] Open
Abstract
The compositions based on bimodal high-density polyethylene (HDPE, copolymer of ethylene with hexene-1) and in mixture with monomodal tercopolymer of ethylene with butene-1/hexene-1 (LLDPE, low-density polyethylene) have been studied. Phase equilibrium, thermodynamic parameters of interdiffusion in a wide range of temperatures and ratios of co-components were identified by refractometry, differential scanning calorimetry, optical laser interferometry, X-ray phase analysis. The phase state diagrams of the HDPE—LLDPE systems were constructed. It has been established that they belong to the class of state diagrams of “solid crystal solutions with unrestricted mixing of components”. The paired parameters of the components interaction and their temperature dependences were calculated. Thermodynamic compatibility of α-olefins in the region of melts and crystallization of one of the components has been shown. The kinetics of formation of interphase boundaries during crystallization of α-olefins has been analyzed. The morphology of crystallized gradient diffusion zones has been analyzed by optical polarization microscopy. The sizes of spherulites in different areas of concentration profiles and values of interdiffusion coefficients were determined.
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Affiliation(s)
- Ildar I. Salakhov
- PJSC NIZHNEKAMSKNEFTEKHIM, Nizhnekamsk, Sobolekovskaya 23, 423574 Republic of Tatarstan, Russia;
- Correspondence: (I.I.S.); (A.E.C.)
| | - Anatoly E. Chalykh
- Frumkin Institute of Physical chemistry and Electrochemistry, Russian Academy of Sciences (IPCE RAS), Leninskiy Prospekt, 31, 119071 Moscow, Russia; (A.V.S.); (N.Y.B.); (R.R.K.); (V.K.G.)
- Correspondence: (I.I.S.); (A.E.C.)
| | - Nadim M. Shaidullin
- PJSC NIZHNEKAMSKNEFTEKHIM, Nizhnekamsk, Sobolekovskaya 23, 423574 Republic of Tatarstan, Russia;
| | - Alexey V. Shapagin
- Frumkin Institute of Physical chemistry and Electrochemistry, Russian Academy of Sciences (IPCE RAS), Leninskiy Prospekt, 31, 119071 Moscow, Russia; (A.V.S.); (N.Y.B.); (R.R.K.); (V.K.G.)
| | - Nikita Yu. Budylin
- Frumkin Institute of Physical chemistry and Electrochemistry, Russian Academy of Sciences (IPCE RAS), Leninskiy Prospekt, 31, 119071 Moscow, Russia; (A.V.S.); (N.Y.B.); (R.R.K.); (V.K.G.)
| | - Ramil R. Khasbiullin
- Frumkin Institute of Physical chemistry and Electrochemistry, Russian Academy of Sciences (IPCE RAS), Leninskiy Prospekt, 31, 119071 Moscow, Russia; (A.V.S.); (N.Y.B.); (R.R.K.); (V.K.G.)
| | - Ilya E. Nifant’ev
- A.V.Topchiev Institute of Petrochemical Synthesis, Russian Academy of Sciences (TIPS RAS), Leninsky Prospekt 29, 119991 Moscow, Russia;
| | - Vladimir K. Gerasimov
- Frumkin Institute of Physical chemistry and Electrochemistry, Russian Academy of Sciences (IPCE RAS), Leninskiy Prospekt, 31, 119071 Moscow, Russia; (A.V.S.); (N.Y.B.); (R.R.K.); (V.K.G.)
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Rickert R, Klein R, Schönberger F. Form-Stable Phase Change Materials Based on SEBS and Paraffin: Influence of Molecular Parameters of Styrene-b-(Ethylene- co-Butylene)-b-Styrene on Shape Stability and Retention Behavior. MATERIALS (BASEL, SWITZERLAND) 2020; 13:ma13153285. [PMID: 32718015 PMCID: PMC7435445 DOI: 10.3390/ma13153285] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 06/24/2020] [Revised: 07/08/2020] [Accepted: 07/15/2020] [Indexed: 06/11/2023]
Abstract
In this work, the influence of molecular parameters of styrene-b-(ethylene-co-butylene)-b-styrene (SEBS) triblock copolymer as matrix material in form-stable phase change material (FSPCM) on the thermo-mechanical properties and leakage behavior are studied. Various SEBS grades differing in their molecular weight, styrene content, and ethylene/butylene ratio are used as supporting matrix in composites with 90 wt.% paraffin. Thermo-mechanical properties are determined by rheological measurements. The results show phase transitions temperatures from solid to hard gel, hard gel to soft gel, and soft gel to gel fluid. Paraffin leakage in FSPCM is analyzed by mass loss over time in an oven at 60 °C. Differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA) are applied to determine the thermal energy storage capacity. Finally, the molecular weight and the styrene content are combined to the molecular weight of styrene block which is identified as the authoritative parameter for the thermo-mechanical properties of the SEBS/PCM composite.
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Keshmirizadeh E, Modarress H, Eliassi A, Mansoori G. A new theory for polymer/solvent mixtures based on hard-sphere limit. Eur Polym J 2003. [DOI: 10.1016/s0014-3057(02)00373-7] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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