PPS聚苯硫醚的优缺点以及改性目的 

 Polyphenylenesulfide (PPS) features excellent mechanical properties, thermal stability, chemical resistance, flame resistance and precise moldability. However, PPS has a weak point of being a very brittle material. For use as electrical and electronic parts, automobile and mechanical parts, toughened PPS is desired. For these applications, improving the toughness of PPS and developing an elastomer toughened PPS and related compounds are desired.

    The targets of our development are as follows:

  The first point is to maintain the advantages of PPS such as its thermal properties, mechanical properties, etc.

The second point is to improve the brittleness of PPS using the polymer alloy method.

    聚苯硫醚虽具有一系列优良性能，但存在材料较脆、耐冲击性能较差、伸长率较低、加工成型性有待改进、价格较昂贵等缺点，为了提高PPS的韧性，降低成本，并使它具有新的功能性以扩大它的应用范围，需要对其改性。

PPS/PA

    Polyamide (PA) is a widely used engineering plastic. It possesses an outstanding combination of properties such as low density, easy processing, good strength and solvent resistance. However, its heat distortion temperature is low and because of the presence of amide groups in the molecular chain, it easily absorbs water which deteriorates its mechanical properties and dimensional stability. Polyphenylene sulfide (PPS) possesses high temperature resistance combined with good mechanical properties, exceptional chemical and solvent resistance, high dimensional stability and easy processing. It has, however, a lower elongation to break, a higher cost and is rather brittle. In order to improve these adverse effects, some researchers have blended both materials and obtained a polymer alloy with outstanding properties [5–7].

    PPS具有良好的可共混改性，PPS具有很多优良的特性，但也存在耐冲击性能差，加工成型性有待提高等缺点。极好的粘合性使PPS通过填充和增强就可大幅度提高强度、刚度和耐热性;此外，通过共混乃至合金化的方法也能傀PPS性能获得有效的改善和补充，其中最令人瞩目的是PPS/PA合金、PPS/PSF合金及PPS/PTFE合金。

PPS和PA的溶解度参数比较接近，PPS的溶解度参数为12.5 (J/mL)^1/2,,PA的溶解度参数为12. 7-13.6(J/mL)^1/2，两者的差值仅为0. 5，是具有良好相容性的合金材料。PPS/PA合金既可提高PA的刚性、耐热性，降低吸水性，也可同时改进PPS的加工流动性能。PPS与PSU通过溶液共聚或熔融共混的方法制成的PPS/PSU合金，可以使PPS的冲击强度提高5倍，弯曲强度提高7倍。

Poly (phenylene sulfide) (PPS) was first commercialized by Philips Petroleum Co. in 1973. PPS has a glass transition temperature of 80–90±C and melting temperature of 280±C. PPS has good dimensional stability, high strength, high modulus, chemical and fatigue resistance, and can be a metal substitute engineering plastic. PPS is synthesized from p-dichlorobenzene and sodium sulfide in an organic solvent. However, PPS has brittle nature, low strain at break and slow crystallization rate, thus it is generally used as a glass fiber reinforced composite form.

Mechanical properties and fracture morphologies of poly(phenylene sulfide)/nylon66 blends—effect of nylon66 content and testing temperature

Poly (phenylene sulfide) (PPS) is a highly crystalline polymer containing alternating aromatic rings and sulfur linkages. The combined effects of polymer chain crystallinity and rigidity yield excellent mechanical properties, thermal stability, and solvent resistance. Few solvents will attack

PPS at temperatures below 200°C.With a melting point of 285°C, PPS provides thermal stability in end-use applications to 220°C. Despite an attractive property profile, broader applications of PPS in the commercial market are limited by excessive brittleness, the tendency to flash during injection molding, and relatively high cost. Some of these inherent deficiencies have been addressed by utilizing different manufacturing processes and also through the development of polymer blends.

Phase Separation in Semicrystalline Blends ofPoly(phenylene sulfide) and Poly(ethylene terephthalate). I.Preparation of Poly(phenylene sulfide)-graft-Poly(ethyleneterephthalate) Copolymers by Ester Interchange and Characterization Utilizing the Model Compound2,4-Bis(phenylthio benzoic acid)

STEPHEN J. HANLEY,1,2* JOSEPH J. RAFALKO,3 KATHLEEN A. STEELE,1 H. CLAY LINSTID,3 THOMAS J. DOLCE,4 L. H. SPERLING2

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