Crystallinity of Amphiphilic PE-b-PEG Copolymers
Abstract
:1. Introduction
2. Materials and Methods
2.1. Materials
2.2. Characterization
DSC and Optical Microscopy Analysis
3. Results
3.1. PEG Homopolymer
3.1.1. Thermal Analysis
3.1.2. Morphology and Growth Rate of PEG Homopolymer Crystalline Structures
3.2. PE Homopolymer
3.2.1. Thermal Analysis
3.2.2. Morphology and Growth Rate of PE Crystalline Structures
3.3. Crystallinity of PE-b-PEG Copolymers
3.3.1. Thermal Analysis
3.3.2. Morphological Analysis and Crystalline Growth Rate Determination
PE-b-PEG C (83 wt. % PEG) Copolymer
PE-b-PEG A (23 wt. % PEG) Copolymer
PE-b-PEG B (55 wt. % PEG) Copolymer
4. Discussion
5. Conclusions
Author Contributions
Funding
Institutional Review Board Statement
Conflicts of Interest
References
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Chemical Composition Determined by 1H NMR | ||||||
---|---|---|---|---|---|---|
Polymer | Mn PE [g·mol−1] | Mn PEG [g·mol−1] | PE Block [wt. %] | PEG Block [wt. %] | PE Block [molar %] | PEG Block [molar %] |
PEG | - | 2041 | - | 100 | - | 100 |
PE | 1630 | - | 100 | - | 100 | - |
PE-b-PEG A | 334 | 101 | 77 | 23 | 84 | 16 |
PE-b-PEG B | 326 | 385 | 45 | 55 | 57 | 43 |
PE-b-PEG C | 311 | 1474 | 17 | 83 | 25 | 75 |
DSC | Optical Microscopy | ||
---|---|---|---|
PEG crystallization temperatures (°C) | Tc initial | 39 | 40 |
Tc final | 24 | 35 | |
PEG melting temperatures (°C) | Tm initial | 43 | 49 |
Tm final | 59 | 60 |
DSC | Optical Microscopy | ||
---|---|---|---|
PE crystallization Temperatures (°C) | Tc initial | 101 | 108 |
Tc final | 19 | 50 | |
PE melting temperatures (°C) | Tm initial | 29 | 30 |
Tm final | 111 | 110 |
PE-b-PEG C (83 wt. % PEG) | DSC | Optical Microscopy | |
---|---|---|---|
PE crystallization Temperatures (°C) | Tc initial | - | 94 |
Tc final | - | 50 | |
PE melting temperatures (°C) | Tm initial | - | 76 |
Tm final | - | 90 | |
PEG crystallization temperatures (°C) | Tc initial | 37 | 33 |
Tc final | 24 | 31 | |
PEG melting Temperatures (°C) | Tm initial | 35 | 52 |
Tm final | 58 | 58 |
PE-b-PEG A (23 wt. % PEG) | DSC | Optical Microscopy | |
---|---|---|---|
PE crystallization Temperatures (°C) | Tc initial | 90 | 95 |
Tc final | <10 | 70 | |
PE melting Temperatures (°C) | Tm initial | 17 | 85 |
Tm final | 96 | 98 | |
PEG crystallization Temperatures (°C) | Tc initial | - | - |
Tc final | - | - | |
PEG melting Temperatures (°C) | Tm initial | - | - |
Tm final | - | - |
PE-b-PEG B (55 wt. % PEG) | DSC | Optical Microscopy | |
---|---|---|---|
PE crystallization Temperatures (°C) | Tc initial | 87 | 94 |
Tc final | 5 | 79 | |
PE melting Temperatures (°C) | Tm initial | 47 | 60 |
Tm final | 98 | 95 | |
PEG crystallization Temperatures (°C) | Tc initial | 3 | - |
Tc final | −12 | - | |
PEG melting temperatures (°C) | Tm initial | 28 | 26 |
Tm final | 45 | 55 |
PEG Crystalline Structures | PE Crystalline Structures | |||||||
---|---|---|---|---|---|---|---|---|
Polymer | Mn PEG Block (g·mol−1) | PE Block (wt. %) | Size (µm) | Growth Rate (µm/s) | Crystallinity Degree (%) | Size (µm) | Growth Rate (µm/s) | Crystallinity Degree (%) |
PEG | 2041 | 0 | 200 | 17 | 95 | - | - | - |
PE-b-PEG C | 1474 | 17 | 200 | 4 | 82 | 11 | 0.03 | 0 |
PE-b-PEG B | 385 | 45 | - | - | 16 | 10 | 0.02 | 27 |
PE-b-PEG A | 101 | 77 | - | - | 0 | 16 | 0.04 | 94 |
PE | 0 | 100 | - | - | - | 40 | 0.2 | 46 |
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Bistac, S.; Brogly, M.; Bindel, D. Crystallinity of Amphiphilic PE-b-PEG Copolymers. Polymers 2022, 14, 3639. https://doi.org/10.3390/polym14173639
Bistac S, Brogly M, Bindel D. Crystallinity of Amphiphilic PE-b-PEG Copolymers. Polymers. 2022; 14(17):3639. https://doi.org/10.3390/polym14173639
Chicago/Turabian StyleBistac, Sophie, Maurice Brogly, and Diane Bindel. 2022. "Crystallinity of Amphiphilic PE-b-PEG Copolymers" Polymers 14, no. 17: 3639. https://doi.org/10.3390/polym14173639