Plastic & rubber additives
A range of polar modifiers
SEQENS offers a range of polar modifiers, MODENS BR and MODENS BS, enabling the production of styrenic block copolymers with enhanced properties. Polar modifiers are especially used for SBS (Styrene-Butadiene-Styrene) and s-SBR (solution Styrene-Butadiene synthetic Rubber) polymerization.
SBS are often used to enhance the performance of many products. They are widely used in sealants, medical devices, hotmelt adhesives, toy products, shoe soles and in bitumen products for road paving and roofing applications. They are also used as impact modifiers and tougheners in plastics and adhesives.
The property of s-SBR differs from traditional rubber as its composition can be customized by variations and levels of functionalization according to the processing and application demands. s-SBR applies to meet or exceed the tire labeling requirements about fuel efficiency, safety and noise for cars and lightweight vehicles thanks to its low rolling resistance, high traction during braking and low abrasion.
These block copolymers consisting of a sequence of hard styrene blocks and soft butadiene blocks, are obtained through anionic polymerization technology which allows to produce tailor-made styrenic block copolymers by controlling polymer composition, microstructure, molecular weight distribution, degree and level of branching.
MODENS polar modifiers allow:
- A random incorporation of styrene to get the requested elastomeric performance characteristic
- To control the molecular weight distribution
- Microstructure modification with a high vinyl content to increase Tg (glass transition temperature) of polymer for an excellent balance of handling, wed skid, traction and rolling resistance properties
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Other types of additives can be used to customize the styrenic block copolymers performances. For example, coupling agents such as MODENS DEAP (diethyl adipate), reacts with the living block styrenic copolymers to form radial polymers having at least two branches. The long chain polymeric branches radiate from MODENS DEAP and such coupled polymers have specific properties such as better flow properties than linear polymers of the same molecular weight. That render them useful for applications such as bitumen, tires, sealants and adhesives.
Also, Di-n-Butyl Ether (line vers page produit?) is a solvent that can be used during the production of styrenic block copolymers. This polymer processing by anionic polymerisation is typically done in ether solvent, and MODENS SV offers good physical and chemical properties to facilitate this polymerisation such as its boiling point (140°C- 143°C), low peroxide content (<50ppm), water immiscibility and high flash point (25°C). It is also often used in organometallic chemistry including organo lithium salts.