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NEXAMITE®

Nexam Chemical offers the NEXAMITE® product range with multifunctional additives with intended uses as chain extenders, branching agents and crosslinkers.

NEXAMITE® can also function as effective compatibilizers and acid scavengers in the manufacture of virgin polymer blends, engineering plastics and recycling of mixed plastics.

Added values using NEXAMITE® are:

  • Improved hydrolytic and thermal stability
  • Allows for the use of low viscosity polymers
  • Enables for upgrading of spent and recycled material
  • Allows for controlled branching and crosslinking degree 
  • Makes possible for the compatibilization of polymer blends

 

NEXAMITE® represents a new technology of cost-effective polymer modification and compatibilization. Several compositions with many interesting properties in different areas have been proved. The following application table gives a general picture with some classical examples of how NEXAMITE® can be used in different cases on the whole value chain.  

 

Table 1: NEXAMITE®PBO value chain Table 1: NEXAMITE® value chain      

 

 

NEXAMITE® technology improves melt viscosity, hydrolytic stability and heat resistance, useful in a variety of industries. The chemical, physical and mechanical properties, assosicated with the ease of formulating tough, machine-able materials give opportunities to use NEXAMITE® in a wide range of plastic materials and mold-making applications. Further, it contributes to the manufacture of composite materials targeting low energy/ high-speed trains and lightweight construction.

Figure 1: NEXAMITE® application examples

The renewable energy market requires high-performed materials to achieve strong stability and rigidity at minimal weight. NEXAMITE®  makes it possible to develop fiber and foam materials that contributes many parts of wind turbine applications, like spinners, blades and nacelles.

Applications

Applications for NEXAMITE® exit in variuos specification in different markets, which ranges from our daily life, such as surfboards and gym mats, to modern industrial components like aircraft wings and rotor blades. NEXAMITE®  technology contributes strongly in materials like foam and fiber that are widely applied in a large number of solutions like sandwich structures and composite materials. 

CASE: Improve mechanical performance of foam core materials and blade shells in rotor blades

Foam and composite plastics are used in the sandwich construction of rotor blades to offer strength and rigidity while keeping minimal light weight. Today, as rotor blade size increases, it becomes even more important to provide high strength, stability and light weight.


Figure 2: NEXAMITE® applications in rotor blades

 

By using NEXAMITE® to control chain extension and branching with higher end viscosity at the same power consumption can be achieved. Resulting in more effective process and foam with extraordinary material properties, which plays a vital role in markets such as wind energy, aerospace and marine.

Materials

There are many materials that may benefit from NEXAMITE® formulations. The technology provides a tougher and stronger material than traditional ones. The addition of NEXAMITE®, as a reactive chain-extender, will result in the further improved elongation at break, as well as the tensile strength.

CASE: NEXAMITE® enhances mechanical performance of injection molded PLA

Greatly increased the elongation at break of the PLA/PBAT blends without sacrificing their high tensile strength were fabricated by melt mixing polymer blend with NEXAMITE® formulations.

Scanning electron microscopy results revealed that the PBAT particles became finer and were uniformly dispersed in the matrix when the compatibilizers were incorporated, which indicated that the interfacial bonding and compatibilization between PLA and PBAT were improved in the presence of the NEXAMITE® formulations. Compared with PLA/PBAT blends, the molecular weight of the blends were increased due to chain-extending reactions. Differential scanning calorimetry results suggested PBAT decreased the crystallization rate and crystallinity of PLA in the blends. Moreover, the glass transition temperature of PBAT was further decreased when the compatibilizers were used.

To get more information about the CASE, please read article:  Influence of phthalic anhydride and bioxazoline on the mechanical and morphological properties of biodegradable poly(lactic acid)/poly[(butylene adipate)-co-terephthalate] blends, Weifu Dong, Benshu Zou, Piming Ma, Wangcheng Liu, Xin Zhou, Dongjian Shi, Zhongbin Ni, Mingqing Chen, 8 June 2013, Wiley Online Library, DOI: 10.1002/pi.4568

NEXAMITE® - phenolic resin

Several of bisoxazoline - phenolic resin have been formulated and commercialized. These materials are processable and they can be reinforced by the use of glass fibers.

The NEXAMITE® - phenolic resin possesses the low smoke and heat release requirement for interior components in aerospace, automotive, building and construction, etc. It performs over a wide range of temperature and outperform Epoxy and Phenolics in many important properties.

The figure 3 shows these properties of the NEXAMITE® - phenolic resin and other high performance materials.

 


Figure 3: Comparative properties of various high performance polymers ( GIC is fracture energy, TGA is thermo gravimetric analysis )

Read more about crosslinkable polyether-amide materials in the article: Advances in addition-cure phenolic resins, C.P. Reghunadhan Nair, Prog. Polym. Sci. 29 (2004) 401–498., DOI: 10.1016/j.progpolymsci.2004.01.004

 

NEXAMITE® technology is based on chemistries that are used in highly reactive extrusion processes. It combines the terminal ends of polyesters, polyamides and other polymers without the formation of volatile by-products.  

Figure 5 shows some possible reactions of NEXAMITE®, which may be achieved under suitable reaction conditions.  

       
         Figure 5: Reactions of NEXAMITE®

How does NEXAMITE® work? Controlled chain extension & branching !

Most chain extending technologies are based on polyfunctional systems with little or no control of branching/gel formation. NEXAMITE® chain extension has overcame this difficulty. The level of chain extension can be tailored by using NEXAMITE® end group modifiers. The degree of branching can be controlled with little or no risk of gel-formation.

The mechanism during processing is showed as followed: 


Figure 6: Formulation of NEXAMITE® (blue dots) together with other additives (red dots) allow for controlled branching

The red and blue arrow lines represent polymer, for example, PET, PBT, PA or PC. The blue coins are NEXAMITE® chain extender and red coins are branching agent. NEXAMITE® dosing includes 0.1-1 % as chain extender and 0-5% with branching agent. 

 

Modification of Polyesters using NEXAMITE®

Reactive extrusion

The following diagram shows that chain extension/ crosslinking can be controlled by different NEXAMITE® formulations.  


Figure 7: Reactive extrusion

The light blue formulation is designed to improve hydrolytic and thermal stability, which is shown by maintained pressure.

The red formulation is designed to allow for two-stage crosslinking. Crosslinking is activated after 3-5 min, resulting in a sufficient processing window in the first stage. 

The dark blue formulation is designed for crosslinking during extrusion. 

Processing stability and minimal degradation

The above NEXAMITE® light blue formulation compensates for the loss in Mw due to the moisture, acidity and temperature. The figure shows the improved stability maintains over more or less any molding/ processing cycle. 


Figure 8:  PET dry, PET wet VS PET with NEXAMITE® formulation in mini-extruder

Maximize properties and minimize power requirement

Too fast chain extension results in high torque and power consumption limiting final viscosity and thereby end properties. With NEXAMITE® technology it is possible to slow down the chain extension speed to fit perfectly with the residence time in the extruder. In this way power consumption is minimized and material properties maximized.

updated: Traditional PET chain extender
Figure 9: Evolution of viscosity in the extruder. If area A2 is equal to or smaller than A1, less or the same amount of energy is required to process the NEXAMITE® formulation. The result is that, by using NEXAMITE® chain extension technology, higher final viscosities can be achieved

with less power consumption.

Other polymers modified by using NEXAMITE®

Improved thermal stability of polyamides

The processing stability and sensitivity of polyamide 12 can also be improved using NEXAMITE®. The Molecular weight is maintained for a longer time ultimately improving service life. 


Figure10: Improved thermal stability of polyamides

Improved thermal stability of PBT

Just as for the previous examples is also comes true for PBT. Below is a graph showing improved melt stability of PBT compared to an unstabilized material.


Figure11: Dark blue line PBT (ref), red line w 1% NEXAMITE® and light blue line w 2%NEXAMITE®

Product Data & Safety Data Sheet 

To get a Product Data Sheet or Safety Data Sheet for the NEXAMITE® product, please fill out the information below. Your information is private & confidential and will be strictly kept inside Nexam Chemical. The blanks with *  are mandatory.

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Intended use
 
 

Renewable energy

Specific applications for NEXAMITE®: Rotor blades, nacelles, spinners, housing cover panels for gondolas and hubs, tidal blades

 

Architecture, building & construction

Specific applications for NEXAMITE®: Facades, domes, composite bridges, cladding, canopies, column covers, fronts, body components

 

Interior design

Specific applications for NEXAMITE®: Roofs, cover panels, partition walls, ceiling elements, floor plates, sliding doors, tabletops, covers

 

Aerospace

Specific applications for NEXAMITE®: Aircraft cabins, wings, outer side walls, partition walls

 

Automotive

Specific applications for NEXAMITE®: Passenger cars, recreational vehicles, trucks, buses, special purpose vehicles

 

Rail & road

Specific applications for NEXAMITE®: Compartments, pedestals, moveable truck sidewalls, composite sandwich tanks, caravan furniture, engine hoods and covers, vehicle roofs, superstructures on loading platforms

 

Marine

Specific applications for NEXAMITE®: Boat hulls, interior fittings, decks, superstructures, wales, bulkheads & beams

 

Industry

Specific applications for NEXAMITE®: Water & chemical tanks , cold-storage rooms, X-ray tables, pipes, radio telescopes, containers, advertising panels, graphic display board

 

Health, sport & leisure

Specific applications for NEXAMITE®: Gym mats, running shoes, surfboards, canoes, skis, helmets, shelters

Dela:

 

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