Unsaturated Deoxybenzoin Polymers for Halogen-Free Flame Retardancy
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Solution Overview
Problem
Conventional flame retardant additives for polymers often compromise safety and environmental health due to toxicity and bioaccumulation concerns, and non-halogenated alternatives can compromise physical and mechanical properties, while halogenated polymers pose issues with hydrogen chloride evolution and flammability.
Innovation Solution
Development of unsaturated deoxybenzoin compounds and their functionalized polymers with pendent allyl groups that can be cross-linked or substituted, offering improved thermal stability and reduced heat release upon burning, along with phosphite-functionalized polyarylates for enhanced flame retardancy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional flame retardant additives (halocarbons, phosphorus, metal oxides) are used to reduce polymer flammability, then flame retardancy is improved, but safety and environmental health are compromised due to toxicity and bioaccumulation
Solution Approach 1:
The patent extracts and eliminates harmful halogenated flame retardant additives from the polymer system. By removing these toxic substances entirely and replacing them with non-halogenated deoxybenzoin compounds, the invention resolves the contradiction between achieving flame retardancy and avoiding toxicity/bioaccumulation.
Solution Approach 2:
The patent changes the chemical composition parameters by using non-halogenated deoxybenzoin compounds instead of conventional halogenated flame retardants. This parameter change maintains flame retardant functionality while eliminating the toxic and bioaccumulative properties associated with traditional additives.
2Object-generated harmful factors
If non-halogenated flame retardant additives (e.g., alumina trihydrate) are used to improve environmental safety, then toxicity is reduced, but physical and mechanical properties are compromised at high loading levels
Solution Approach 1:
The patent changes the chemical nature of the flame retardant from inorganic fillers like alumina trihydrate to organic deoxybenzoin compounds. This parameter change allows for effective flame retardancy at lower loading levels, thereby preserving the physical and mechanical properties of the polymer.
Solution Approach 2:
The patent creates a composite polymer system incorporating deoxybenzoin compounds that provide both flame retardancy and maintain mechanical integrity. The synergistic interaction between the polymer matrix and deoxybenzoin additive achieves flame protection without the mechanical property degradation seen with conventional inorganic fillers.
3Ease of manufacture
If halogenated polymers are used to achieve certain polymer properties, then processability is improved, but hydrogen chloride evolution and flammability issues arise
Solution Approach 1:
The patent removes halogen atoms from the polymer structure by using non-halogenated deoxybenzoin compounds. This extraction eliminates the source of hydrogen chloride evolution and inherent flammability problems associated with halogenated polymers, while maintaining processability through careful molecular design.
Solution Approach 2:
The patent changes the chemical composition by eliminating halogen content while maintaining polymer processability. The deoxybenzoin compound structure provides appropriate melting point, viscosity, and reactivity characteristics for easy processing without the harmful effects of halogenated structures.
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 polymers exhibit reduced weight loss at elevated temperatures, low char yields, and improved heat release capacity, providing a halogen-free, high thermal stability, and low combustion characteristics, addressing the limitations of existing flame retardant materials.
Implementation Method 1
the thermally-induced conversion of BHDB to diphenylacetylene moieties that char by aromatization
Implementation Method 2
Intrinsically fire-resistant polymers that undergo significant carbonization upon heating are highly desirable, as carbonaceous char formation effectively averts combustion
Implementation Method 3
Intrinsically fire-resistant polymers that undergo significant carbonization upon heating are highly desirable, as carbonaceous char formation effectively averts combustion by producing an insulating layer on the polymer surface
Data Source
AI summary
Deoxybenzoin compounds including unsaturation are disclosed. The unsaturated deoxybenxoin compounds have the structure (I), (II), or (III)wherein R1, R2, R3, R4, R5, R6, and n are defined herein. Also disclosed are polyesters including repeating units having the structure (IV), (V), or a combination thereofwherein Ar1, R7, and m are defined herein. The polyesters can be further functionalized, for example by various phosphorous-containing compounds. The polyesters described herein can be useful for the preparation of various articles having reduced flammability.