What Is 4,4'-(Hexafluoroisopropylidene) Diphthalic Anhydride Powder?

4,4'-(Hexafluoroisopropylidene)diphthalic anhydride powder (6FDA Powder, CAS: 1107-00-2) is a high-performance aromatic dianhydride widely used as a key monomer in advanced polymer materials, particularly fluorinated polyimides. Thanks to its unique molecular structure containing a hexafluoroisopropylidene (–C(CF₃)₂–) group, 6FDA imparts exceptional thermal, mechanical, and optical properties to polymers.

In its commercial form, 6FDA is supplied as a white to off-white crystalline powder and is primarily used in electronics, aerospace, membrane separation, and optoelectronic applications.

Chemical & Physical Properties

Chemical name	4,4'-(Hexafluoroisopropylidene)diphthalic anhydride
Common abbreviation	6FDA
Molecular formula	C₁₉H₆F₆O₆
Molecular weight	~444.24 g/mol
CAS number	1107-00-2
Appearance	White crystalline powder
Odor	Odorless
Melting point	~238–242 °C
Solubility	Soluble in polar aprotic solvents (e.g., DMF, DMAc, NMP, DMSO) Insoluble or poorly soluble in water and nonpolar solvents
Stability	Stable under dry, inert conditions; sensitive to moisture due to anhydride functionality

The anhydride groups in 6FDA Powder are highly reactive toward diamines, making it an ideal monomer for polycondensation reactions.

The "6FDA Effect": Mechanism of Action in Polymers

When polymerized with a diamine, 6FDA Powder imparts a unique set of properties to the resulting polyimide, often called the "6FDA Effect":
1.Enhanced Free Volume & Chain Disruption: The bulky -C(CF₃)₂- group acts as a "molecular propeller," preventing polymer chains from packing densely. This creates significant nanoscale free volume, which is the foundational principle behind its superior gas separation performance.

2.Electron-Withdrawing Nature: The fluorinated group withdraws electron density from the imide ring, increasing the polymer's oxidative stability and often improving its optical transparency by reducing charge-transfer complex formation.

3.Low Polarizability & High Electronegativity of Fluorine: C-F bonds have very low polarizability, which directly leads to a low dielectric constant (low-k)-a critical property for next-generation microelectronics. High fluorine electronegativity increases hydrophobicity and chemical resistance.

4.Controlled Solubility: While imparting rigidity, the -C(CF₃)₂- group can also improve solubility in polar aprotic solvents (like DMAc, NMP), enabling solution processing-a rare and valuable trait for high-temperature polymers.

Primary Applications: Enabling Advanced Technologies

6FDA-based polymers are indispensable in fields where material performance boundaries are pushed.

Application Field	Specific Use	Property Leveraged
Gas Separation Membranes	• O₂/N₂ separation (enriched oxygen production) • CO₂/CH₄ separation (natural gas sweetening, biogas upgrading) • H₂ purification (from refinery streams) • Organic vapor recovery	High permeability & selectivity due to engineered free volume and rigid backbone
Microelectronics	• Interlayer dielectric (ILD) films in integrated circuits • Flexible display substrates	Low dielectric constant (k~2.7-3.0), high thermal stability, good planarization.
Aerospace & Optics	• Lightweight, high-strength components • Transparent films for sensors, displays, and flexible optics	High Tg (＞300°C), mechanical strength, optical transparency, and low color.
Advanced Coatings & Adhesives	• Protective coatings for harsh environments • High-performance adhesives	Exceptional chemical resistance, thermal-oxidative stability, and adhesion.

Product Specifications

The quality of 6FDA powder directly dictates the molecular weight and final properties of the polymer. Specifications are exceptionally tight.

Parameter	Specification	Rationale
Purity (Assay)	≥ 99.0%	Any monoanhydride or acidic impurities act as chain terminators, severely limiting polymer molecular weight (Mn).
Melting Point	Sharp range, e.g., 242 - 246 °C	Indicator of purity and crystallinity. Broad range suggests impurities.
Water Content	≤ 100 ppm (0.01%) by Karl Fischer	Moisture hydrolyzes the anhydride. Even 0.1% water can devastate stoichiometry and Mw.
Free Acid Content	≤ 0.1 % (as phthalic acid equivalent)	Direct measure of hydrolytic degradation; also a chain terminator.
Metallic Impurities	Specific limits for Na⁺, K⁺, Fe³⁺, etc. (e.g., <5 ppm each)	Can catalyze undesirable side reactions or degrade electronic properties.
Shelf Life & Storage	12-24 months in hermetically sealed, inert gas-filled containers at < 0°C (freezer) or -20°C.	Absolute protection from moisture and oxygen is mandatory to prevent hydrolysis and maintain reactivity.

4,4'-(Hexafluoroisopropylidene)diphthalic anhydride powder (6FDA powder) is a premium fluorinated dianhydride monomer essential for producing high-performance polyimides and advanced polymer materials. Its unique fluorinated structure delivers exceptional thermal stability, chemical resistance, optical clarity, and processability, making it indispensable in electronics, aerospace, membrane science, and advanced materials engineering.

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