Polymer Membrane Crosslinking for Low-Fouling Sterile Filtration
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Solution Overview
Problem
Existing polymer membranes used in biopharmaceutical filtration suffer from protein adsorption, poor caustic stability, and inadequate sterilization stability, leading to reduced membrane flux and increased operational costs.
Innovation Solution
A method involving the use of two crosslinking agents to modify polymer membranes, forming a three-dimensional crosslinked network through irradiation, enhancing stability and reducing protein adsorption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If crosslinking agents and monomers are used to modify polymer membranes, then protein adsorption is reduced and membrane stability is improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent applies parameter changes by systematically varying the types and concentrations of crosslinking agents (e.g., EGS at 0.1-5% w/v, MBAM at 0.05-2% w/v) and monomers (e.g., GMA at 0.5-10% w/v) to optimize the balance between membrane stability and process complexity. By adjusting these chemical parameters, the modification process achieves reliable caustic and sterilization stability while maintaining manageable manufacturing complexity through controlled reaction conditions.
Solution Approach 2:
The patent employs composite materials by creating a modified membrane structure that combines the base polymer matrix with grafted crosslinked networks. This composite approach integrates multiple functional components (polymer chains, crosslinking agents, monomers) into a unified structure that simultaneously provides mechanical integrity, chemical stability, and reduced protein adsorption, thereby improving reliability without proportionally increasing complexity.
2Object-generated harmful factors
If surface grafting processes are used to reduce protein adsorption, then protein adsorption decreases, but caustic stability and sterilization stability are not adequately addressed
Solution Approach 1:
The patent merges multiple functions into a single modification process by simultaneously achieving protein adsorption reduction, caustic stability, and sterilization stability through the combined action of crosslinking agents and monomers. The crosslinking network formed during surface grafting not only reduces protein affinity but also provides structural reinforcement that confers resistance to caustic solutions and sterilization processes, thereby resolving the contradiction between reducing harmful factors and improving reliability.
3Object-generated harmful factors
If existing modification methods are applied, then protein adsorption is reduced, but mechanical properties may not meet pleating requirements
Solution Approach 1:
The patent applies parameter changes by optimizing the concentration ranges of crosslinking agents (0.1-5% w/v) and monomers (0.5-10% w/v) to achieve the right balance between surface modification effects and bulk mechanical properties. By carefully controlling these parameters, the modification process reduces protein adsorption while maintaining sufficient mechanical strength and flexibility to meet pleating requirements for filter manufacturing.
Solution Approach 2:
The patent applies local quality by concentrating the modification effects primarily at the membrane surface through surface grafting, while preserving the bulk mechanical properties of the base polymer. The crosslinked gel layer formed on the surface provides anti-fouling characteristics, whereas the underlying polymer matrix retains its original mechanical strength and flexibility, allowing the membrane to meet both surface performance and structural requirements for pleating.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The modified polymer membranes exhibit low protein adsorption, caustic stability, autoclave sterilization stability, and gamma sterilization stability, maintaining mechanical properties for filter manufacturing.
Implementation Method 1
pre-wetting a polymer membrane with a crosslinking agent solution
Implementation Method 2
irradiating the pre-wetted polymer membrane to initiate a crosslinking reaction between the first crosslinking agent and the second crosslinking agent on the polymer membrane
Data Source
AI summary
A method for modifying a polymer membrane is disclosed and includes: pre-wetting a polymer membrane using a crosslinking agent solution, where the crosslinking agent solution includes a first crosslinking agent and a second crosslinking agent; irradiating the pre-wetted polymer membrane to initiate a crosslinking reaction; and rinsing and drying the polymer membrane after the crosslinking reaction to obtain a modified polymer membrane. The method for modifying the polymer membrane uses two cross-linking agents to modify the polymer membrane, thereby forming a 3D network on the surface and within the bulk of the polymer membrane to obtain a modified polymer membrane. The modified polymer membrane has low protein adsorption, caustic stability, autoclave sterilization stability, and gamma sterilization stability, while retaining the overall mechanical properties to meet the pleatability requirement for filter manufacturing.