Aramid Composite Paper Composition for High Modulus and Tensile Strength
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Solution Overview
Problem
Existing synthetic papers lack a desirable combination of high average specific modulus and ultimate tensile strength, particularly in aramid-containing papers, which are also required to withstand elevated temperatures without degradation.
Innovation Solution
A paper composition comprising polymeric fibers made from aramid copolymers derived from para-oriented aromatic diamine and benzimidazole monomers, combined with poly(para-phenylene terephthalate) homopolymers and a binder, thermally consolidated at high temperatures and pressures to achieve a specific weight ratio and structural integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional synthetic papers are used, then manufacturing is simple, but the combination of high average specific modulus and ultimate tensile strength is not achieved
Solution Approach 1:
The patent uses a composite fiber system combining aramid fibers (for high strength and thermal stability) with polyester fibers (for modulus and dimensional stability). This composite approach allows the paper to achieve both high ultimate tensile strength and high average specific modulus simultaneously, resolving the contradiction between strength requirements and compositional simplicity.
2Temperature
If aramid fibers are used to improve thermal stability, then resistance to degradation at elevated temperatures is improved, but achieving high average specific modulus becomes difficult
Solution Approach 1:
The patent optimizes the ratio of aramid to polyester fibers and controls the thermal consolidation parameters (temperature, pressure, time) to achieve the desired balance. By adjusting these parameters, the paper maintains thermal stability from aramid while achieving high average specific modulus through proper fiber arrangement and bonding, resolving the contradiction between thermal stability and modulus requirements.
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 resulting paper exhibits an ultimate tensile strength of 21 N-m/g or greater and an average specific modulus of 4950 Pa-m3/g or greater, with enhanced thermal stability and dielectric strength.
Implementation Method 1
thermally consolidated at high temperatures and pressures to achieve a specific weight ratio and structural integrity
Data Source
AI summary
A paper comprising polymeric fibers and a binder, wherein the polymeric fibers comprise first fibers and second fibers, the first fibers comprising an aramid copolymer having a structure derived from the reaction of para-oriented aromatic diamine monomer and benzimidazole monomer with a para-oriented aromatic diacid monomer, the second fibers comprising poly(para-phenylene terephthalate) homopolymer, and the binder comprising a third polymer that is either an aramid homopolymer or aramid copolymer; the paper having an ultimate tensile strength of 21 N-m/g or greater and average specific modulus of 4950 Pa-m3/g or greater.