Poly(ethylene oxide-b-propylene oxide), ratio 0.15:1, is an ethylene oxide/propylene oxide (EO/PO) block copolymer available as a colorless, viscous liquid. It combines poly(ethylene oxide) (PEO) and poly(propylene oxide) (PPO) segments in a polyether material for laboratory formulation studies.
PEO and PPO segments differ in their interactions with water. Across the EO/PO block-copolymer family, composition, block lengths, and molecular architecture influence surface activity and solution behavior. The 0.15:1 designation identifies this grade; confirm the ratio basis when comparing it with materials specified by EO weight percentage or block composition.
For an alternative composition, compare the 3:1 EO/PO grade, 16276. Grade selection should account for documented composition and properties rather than assuming that EO/PO copolymers are interchangeable.
Key Properties
- Product number: 16273
- CAS number: 9003-11-6
- Polymer family: Ethylene oxide/propylene oxide block copolymer
- Grade designation: Ratio 0.15:1
- Appearance: Colorless
- Physical form: Viscous liquid
- Package size: 100 g
- Package catalog number: 16273-100
Applications
Surfactant Formulation Studies
EO/PO block copolymers are studied as nonionic surfactants because their PEO and PPO segments interact differently with aqueous and nonaqueous environments. Surface activity and formulation compatibility depend on the particular grade and the complete formulation.
Solution & Phase-Behavior Research
The EO/PO block-copolymer family is used to investigate the relationship between polymer composition, temperature, concentration, and association in solution. Micellization, clouding, and other phase changes require measurements under defined conditions; a grade’s ratio designation alone does not establish these behaviors.
Comparative EO/PO Formulation Research
Comparisons between EO/PO grades can examine how composition and molecular characteristics affect formulation behavior. Establish comparable concentration, temperature, solvent, and additive conditions, and confirm the composition basis before interpreting differences between grades.
Composition & Formulation Considerations
- Confirm the direction and measurement basis of the 0.15:1 ratio before converting it to an EO or PO percentage
- Compare molecular-weight values only when the average designation and measurement method are known
- Evaluate aqueous solubility or dispersibility at the intended concentration and temperature
- Assess the effects of salts, solvents, and other formulation components on phase behavior
- Do not substitute a named Pluronic or poloxamer grade without confirming composition, molecular architecture, and relevant specifications
Storage & Product Selection
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FAQ
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1. What is this EO/PO block copolymer?
It is a polyether block copolymer containing ethylene oxide and propylene oxide segments, with the grade designation 0.15:1. The product is a colorless, viscous liquid.
2. What does the ratio 0.15:1 mean?
The ratio is the composition designation for this grade. Before calculating EO or PO content, contact Polysciences to confirm the ratio direction, whether it is based on mass or repeat-unit amounts, and how the blocks are counted.
3. Is this the same as a Pluronic or poloxamer grade?
A named Pluronic or poloxamer equivalent has not been established for this product. Compare composition, molecular weight, architecture, and relevant test data before treating materials as interchangeable.
4. Does this grade form micelles or hydrogels in water?
Micelle formation and gelation cannot be established from the ratio designation alone. They depend on molecular characteristics, concentration, temperature, and solution composition. Request grade-specific data or evaluate the material under the intended conditions.
5. How does it differ from the 3:1 EO/PO grade?
The 3:1 EO/PO product, 16276, has a different ratio designation. Confirm the composition basis and other specifications for both grades before comparing hydrophilicity, aqueous behavior, or formulation performance.
6. How should this product be stored?
Store at room temperature. Follow the applicable Safety Data Sheet for handling, storage, and disposal requirements.
7. What size and documentation are available?
The 100 g package is catalog 16273-100. Review the product specification and the SDS linked on this page. Contact Polysciences for available lot documentation, molecular-weight information, or formulation-specific questions.
