Copolyester Elastomer Fiber Spinning With Molecular Weight Control
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Solution Overview
Problem
Existing methods for forming thermoplastic copolyester elastomer-based fibers often result in degradation, leading to a loss of desired properties, necessitating an improved method to control molecular weight and minimize degradation during processing.
Innovation Solution
A method involving the use of a thermoplastic copolyester elastomer with an initial number average molecular weight greater than 35,000 g/mol, followed by spinning to achieve a final molecular weight of 98% to 50% of the initial, utilizing gel permeation chromatography for molecular weight determination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional spinning methods are used to process thermoplastic copolyester elastomer, then fiber production is achieved, but molecular weight degradation occurs leading to loss of desired fiber properties
Solution Approach 1:
The patent applies parameter changes by optimizing spinning conditions including temperature control (maintaining melt temperature below degradation threshold), shear rate control, and residence time reduction. These parameter adjustments prevent excessive molecular weight degradation while enabling successful fiber formation from thermoplastic copolyester elastomers with initial molecular weights greater than 35,000 g/mol
Solution Approach 2:
The patent employs preliminary action by pre-drying the thermoplastic copolyester elastomer to remove moisture before spinning, and by carefully preparing the processing conditions in advance. This preliminary preparation prevents degradation during processing and ensures the molecular weight remains within the desired range (98% to 50% of initial value) in the final fiber product
2Reliability
If processing conditions are optimized to minimize degradation, then fiber properties are preserved, but processing complexity increases
Solution Approach 1:
The patent applies self-service by selecting thermoplastic copolyester elastomers with inherently suitable properties (molecular weight greater than 35,000 g/mol and appropriate molecular weight distribution) that are self-sufficient for successful spinning. The material's own characteristics enable it to withstand processing while maintaining properties, reducing the need for complex external control mechanisms
Data Source
AI summary
A method of making a thermoplastic copolyester elastomer-based fiber is disclosed. The method comprises: providing a thermoplastic copolyester elastomer having a number average molecular weight of greater than 35,000 g/mol; and spinning the thermoplastic copolyester elastomer to provide a fiber comprising a spun thermoplastic copolyester elastomer, wherein the spun thermoplastic copolyester elastomer has a number average molecular weight that is 98% or less to 50% or more the number average molecular weight of the thermoplastic copolyester elastomer. A thermoplastic copolyester elastomer-based fiber made according to the aforementioned method and a fabric comprising the aforementioned thermoplastic copolyester elastomer-based fiber are also disclosed.