Oriented Polyolefin Alloy Creep Resistance
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Solution Overview
Problem
Polyolefins exhibit low creep resistance, especially at elevated temperatures, limiting their industrial applications and often requiring expensive engineering polymers for suitable performance.
Innovation Solution
The development of oriented polyolefin alloys with a continuous polyolefin phase and a dispersed phase of polyester or polyamide, which form fibrils or lamellae, enhancing creep resistance through tensile forces applied during the manufacturing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If polyolefins are used for their cost-effectiveness and ease of manufacture, then manufacturing cost is reduced and ease of manufacture is improved, but creep resistance deteriorates
Solution Approach 1:
The patent applies composite materials by combining polyolefin with polyester or polyamide to create an alloy that maintains the cost-effectiveness and ease of manufacture of polyolefins while achieving the creep resistance of engineering polymers. The dispersed phase of polyester/polyamide fibrils or lamellae within the polyolefin matrix provides this synergistic effect.
2Reliability
If expensive engineering polymers are used to achieve desired creep resistance, then reliability is improved, but manufacturing cost increases
Solution Approach 1:
The patent uses composite materials to achieve the creep resistance of expensive engineering polymers at lower cost by incorporating small amounts of polyester or polyamide (5-50 wt%) into polyolefin. This creates a cost-effective alloy that delivers engineering-grade creep resistance without the full cost premium of traditional engineering polymers.
Solution Approach 2:
The patent applies local quality by creating a heterogeneous structure where polyester/polyamide fibrils or lamellae are dispersed locally within the polyolefin matrix. These localized regions of high creep resistance provide overall alloy performance that matches engineering polymers while maintaining the bulk cost advantages of polyolefin.
3Ease of manufacture
If polyolefin is used for its low cost, then manufacturing cost is reduced, but creep resistance at elevated temperatures deteriorates
Solution Approach 1:
The patent applies composite materials to overcome the temperature limitation of polyolefin by incorporating polyester or polyamide, which maintain their structural integrity at elevated temperatures. The thermally stable dispersed phase reinforces the polyolefin matrix, enabling creep resistance at temperatures where pure polyolefin would fail.
Solution Approach 2:
The patent uses parameter changes by modifying the thermal and mechanical properties of polyolefin through the addition of polyester/polyamide. This changes the alloy's behavior at elevated temperatures, providing creep resistance parameters that match engineering polymers while maintaining polyolefin cost structure.
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 oriented polyolefin alloys demonstrate improved creep resistance, maintaining shape under stress for extended periods at elevated temperatures, with reduced material costs compared to traditional engineering polymers, allowing for applications like geosynthetic articles and agricultural films.
Implementation Method 1
applying tensile forces to the alloy to form fibrils or lamellae of the second polymer dispersed within a matrix formed by the polyolefin
Data Source
AI summary
Disclosed are creep resistant articles having a polyolefin in a continuous phase and fibrils or lamellae of polyester, polyamide, or mixtures thereof dispersed in the continuous phase.