Peroxide-Modified LLDPE Foams for Cable Jacketing
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Solution Overview
Problem
Foaming polymeric materials used in cable jacketing compromise the mechanical properties, particularly tensile elongation, leading to quick failure under deformation, as the void-space cells act as defect sites.
Innovation Solution
A foamable polymeric composition comprising peroxide-modified linear low-density polyethylene (LLDPE) and a blowing agent, which improves the elongation at break of foamed polymeric materials by maintaining thermoplastic properties and controlling the foaming level.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If foaming is introduced into polymeric cable jacketing to decrease weight, then weight reduction is achieved, but tensile elongation and mechanical properties deteriorate due to void-space cells acting as defect sites
Solution Approach 1:
The patent modifies the polyethylene polymer parameters by introducing long-chain branching through peroxide treatment, which fundamentally changes the polymer's molecular structure. This parameter change allows the foam to maintain high tensile elongation (up to 500% improvement) despite the presence of void spaces, resolving the contradiction between weight reduction and mechanical property preservation
Solution Approach 2:
The invention creates a composite foamed structure by combining peroxide-modified polyethylene with blowing agents to form a controlled cellular foam. This composite material achieves both weight reduction (up to 50% weight savings) and improved mechanical properties through the unique long-chain branched polymer structure that prevents defect propagation in the foam cells
2Ease of operation
If conventional polyethylene is foamed to reduce cable weight, then installation ease improves, but mechanical strength and durability decrease due to defect sites in the foam structure
Solution Approach 1:
By changing the molecular parameters of polyethylene through peroxide-induced long-chain branching, the patent enables the foam structure to maintain high mechanical strength while providing weight reduction. The modified polymer structure creates a more robust foam that resists defect propagation, maintaining durability while improving installation ease through reduced weight
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 solution enhances the elongation at break of foamed polymeric compositions by up to 500% compared to unmodified LLDPE foams, while maintaining a thermoplastic state and undetectable gel content, thus addressing the mechanical property degradation in foamed polymeric materials.
Implementation Method 1
the reaction product of a peroxide and an LLDPE
Implementation Method 2
foamable polymeric compositions comprising a peroxide-modified linear low-density polyethylene ('LLDPE') and a blowing agent
Data Source
AI summary
Foamable polymeric compositions comprising a peroxide-modified linear low-density polyethylene, which comprises the reaction product of a peroxide and a linear low-density polyethylene, and a blowing agent. The peroxide-modified linear low-density polyethylene is thermoplastic. Also disclosed are foamed polymeric compositions prepared from such foamable polymeric compositions and methods for making such foamed polymeric compositions. The foamed polymeric compositions described herein are suitable for use in a variety of articles of manufacture, particularly in the wire and cable industry.