Reactive Silicones

Mono terminal and Bi terminal reactive silicones

Amino, Hydroxy, Methacryloxy groups

Additives Bismaleimides (BMI)High Purity Silica Reactive Silicones

Mono Terminal

Product	Structural formula	Molecular weight	Specific gravity	Viscosity
FM-0411P	Hydroxy	1,000	0.96	10 - 25
FM-0421		5,000	0.97	60 - 80
FM-0425		10,000	0.97	140 - 180
FM-DA11	Diol	1,000	0.97	50 - 70
FM-DA21		5,000	0.97	80 - 160
FM-DA26		15,000	0.97	300 - 700
FM-0711	Methacryloxy	1,000	0.96	7 - 13
FM-0721		5,000	0.97	54 - 79
FM-0725		10,000	0.97	150 - 260
TM-0701T	Methacryloxy	423	0.91	2.9 - 6.1

Bi Terminal

Product	Structural formula	Molecular weight	Specific gravity	Viscosity
FM-3311	Amino	1,000	0.95	11 - 15
FM-3321		5,000	0.97	90 - 150
FM-3325		10,000	0.97	200 - 400
FM-4411	Hydroxy	1,000	0.97	30 - 40
FM-4421		5,000	0.98	100 - 125
FM-4425		15,000	0.97	250 - 400
FM-7711	Methacryloxy	1,000	0.98	14 - 20
FM-7721	Methacryloxy	5,000	0.98	30 - 100

What is the content of Volatile components?

We have data on volatile components and low molecular siloxane in JNC products. The content is not zero, but it is generally very low. You can expect the values to be similar between FM-04 and FM-DA series. In addition, the required silaplane for filler dispersion is ±3-5%, making the overall volatiles insignificant.

What is the main usage of mono terminal Silaplane?

Silaplane is meant to be utilized as a filler dispersant and not as a binder resin. Products such as FM-DA21 and FM-DA26 contain low volatile components, and you are invited to evaluate the effectiveness of products with the same functional group but different molecular weights.

Mono and Bi Terminals

Reactive Polydimethylsiloxanes have two main grades. Mono and Bi terminals, meaning they have a reactive site in one or both ends of the chain. Monoterminal silicones are used for grafting polymers while bi terminal types are used for block polymers.

Mono terminal Polydimethylsiloxanes are grafted onto the resin, modifying the surface properties while biterminal Polydimethylsiloxanes are integrated into the block polymer, modifying the physical properties. Their narrow molecular weight distribution ensures uniform reactivity and low volatiles and impurities.

Why do we need the Reactive functional groups?

Not reactive silicones (ie Silicone oil) are not grafted or blocked in place with their functional groups, leading to extensive bleed out. This is a result of plain mixing and zero copolymerization happening between the resin and the Silicone. Mixing doesn't bind anything into place so bleeding can occur very easily.

Filler Dispersion

One of the main applications of the mono terminal Silaplane, which has a linear chain resin, is the ability to make the inorganic filler easier to blend into the silicone binder resin. In other words, it facilitates filler dispersion.

It improves the flowability of the highly filled filler dispersions and facilitates their handling. It is a perfect fit for applications that would benefit from the introduction of higher filler content, such as Thermal Interface Materials.

The product's narrow molecular weight distribution ensures uniform reactivity, low impurities and also low volatiles. With this variability, we can fine tune the silicone and compatibility buttons and have a product that perfectly fits the best of both worlds.

The silicone functional group of our Reactive PDMS (Polydimethylsiloxane) has a very high affinity to bind on the silicone binding resin. This improves the wettability between the resin and the filler. Additionally, the repulsive force that is created between the fillers, stabilizes the dispersion. This is a result of the silicone repulsion and the osmotic pressure effect.

The material turns from a highly viscous fluid that is in an aggregated state to a low viscosity one in a dispersion state that flows easier while also retaining higher filler content than it otherwise could. This results in higher flowability compared to other common silane dispersants.

In practical terms this means two things:

Reactive silicones can lower the viscosity while keeping the same thermal conductivity and filler ratio
Reactive silicones can increase thermal conductivity by allowing an increase in filler content.

Filler dispersion applications can benefit from the grafting properties of Mono terminal PDMS and the repulsive force that is created between the fillers. That's why we suggest them for this type of application. Hydroxy and Diol Hydroxy functional groups lend themselves better as a filler dispersant and have been used successfully on TIM applications.

Silaplane molecular weight distribution is very narrow (~1.03-1.4 Mw/Mn compared to the 1.8 or higher of general reactive silicones) and you have a choice between compatibility and acquired silicone properties to fine-tune your end product.

Here's how Silaplane can be used in Alumina-filled dispersion and how it affects the Viscosity

improved viscosity with reactive silicones

Practically, this means two things

It lowers the viscosity of dispersion, maintaining the thermal conductivity with the same filler fill ratio
It increases the heat dissipation perfromance (thermal conductivity)by further increase of the filler filling ratio

Products for Filler dispersion

Product	Structural formula	Molecular weight	Specific gravity	Viscosity
FM-0411P	Hydroxy	1,000	0.96	10 - 25
FM-0421		5,000	0.97	60 - 80
FM-0425		10,000	0.97	140 - 180
FM-DA11	Diol	1,000	0.97	50 - 70
FM-DA21		5,000	0.97	80 - 160
FM-DA26		15,000	0.97	300 - 700