Sample interview questions: How do you approach the optimization of polymer compositions and processing conditions for membrane fabrication?
Sample answer:
Approaching Optimization of Polymer Compositions and Processing Conditions for Membrane Fabrication
1. Determine Performance Objectives:
* Define specific membrane performance criteria (e.g., permeability, selectivity, fouling resistance).
* Consider the target application and operating conditions.
2. Select Polymer Materials:
* Identify candidate polymers based on their intrinsic properties (permeability, compatibility, stability).
* Explore polymer blends or functionalized polymers to modify performance.
3. Optimize Polymer Composition:
* Vary polymer ratios in blends to achieve desired permeability and selectivity.
* Introduce additives or modifiers to enhance specific properties (e.g., plasticizers for flexibility).
* Use statistical design of experiments (DOE) for efficient optimization.
4. Optimize Processing Conditions:
* Control casting conditions (evaporation rate, temperature, humidity) to influence membrane morphology and performance.
* Optimize post-processing steps (e.g., annealing, crosslinking) to enhance stability or functionality.
* Use experimental techniques (e.g., rheology, differential scanning calorimetry) to understand polymer behavior during processing.
5. Evaluation and Characterization:
* Conduct rigorous performance testing to evaluate permeability… Read full answer