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Abstract
PPOÒ SA120 resin is a new low molecular weight (Mn »2500) polyphenylene-ether (PPE) resin recently commercialized by GE Plastics as a polymer additive. In addition to having the well-known properties inherent to PPE, this new resin has an excellent thermal performance (glass transition temperature (Tg) of 165°C) combined with a characteristic feature of improved processability.
The low molecular weight of the new PPE resin allows PPE to be more easily processed in high heat thermoplastic systems. Comparative examples of PPOÒ SA120 and polystyrene are shown in the report. Reported herein is an evaluation of PPOÒ SA120 resin in a PPE-based thermoplastic formulation. Data shows that adding lower molecular weight PPE leads to a higher flow promotion. It also could have higher impact resistance and a negligible decrease on heat distortion temperature (HDT). Improvements in melt flow index and impact resistance are gained with the addition of low molecular weight PPE. SA120 may also be added to many other thermoplastics as a flow promoter.
Key Words: polyphenylene oxide, PPO, polyphenylene ether, PPE, flow promotion, flow promoter, high heat thermoplastic, melt flow
Slide 1 of 8
Jan. 15, 2002
Development of PPO® SA120 as Flow Promoter to Thermoplastic Resins
Objective
Experimental: SA120/high IV PPE blend
DOE results (Design of Experiments)
Conclusions
Global Noryl® Resin, GE Plastics
PPO® and Noryl ® are a registered trademarks of General Electric Company
Slide 2 of 8
Objective
Concept
Keep heat performance
No remarkable drop at Tg
Improve flow (MFI)
Lower processing temp.
Flow promoter
SA120
Add to
Tg=160C,
high heat performance
IV=0.12,
Low IV, high flow
Thermoplastic resins
Such as PPE, PEI, PEEK
Widely used at Auto, Electric, Machine…
Application Example
Present product
Customer requirement:
No more design space at present material !!
Noryl® resin
High flow
resin composition:
PPE* 76
polystyrene 16
rubber 8
Properties:
MFI 12.4 g/10min
Izod 25 kgcm/cm (4.59 ft-lb/in)
HDT 159.8 °C
* Refers to High IV PPE
Investigate flow promotion effect of PPO® SA120
Slide 3 of 8
Experimental
PPE/SA120 blend (Four Components Mixture DOE)
Extrusion
Extruder: twin screw
Ext. Temp. (C): 250 (ext. pattern: 01-09)
Screw speed (rpm): 200
Output (kg/hr): 40
Formulations
(based on Noryl® resin)
PPE (high IV) 70-95
SA120 (low IV) 0-20
Polystyrene 0-25
Rubber 5-30
Stabilizers 0.4
Carbon black 0.5
Molding
Drying temp. 120C, 2hr
Injection Molding pattern: M3-01
Testing
using standard ASTM conditions.
Izod (kgcm/cm): 1/8 in.
Tensile Strength (kg/cm2): ASTM-1, 10mm
Tensile Elongation (%): ASTM-1
Flexural Strength (kg/cm2): ¼ in., 2.5mm
Flexural Modulus (kg/cm2): ¼ in.
HDT (C): ¼ in., load...
