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供应玻纤增强PEI 基础创新塑料(美国) 240

PEI 基础创新塑料(美国) 2400         

PEI 基础创新塑料(美国) 2400

PEI 基础创新塑料(美国) 2400

PEI 基础创新塑料(美国) 2400

PEI 基础创新塑料(美国) 2400

PEI 基础创新塑料(美国) 2400 其他型号报价:

在380℃下熔融挤出制得聚醚醚酮(PEEK)与聚醚酰亚胺(PEI)共混物。采用差示扫描量热仪(DSC)和广角x射线衍射仪(WAXD)研究了共混物的相容性和结晶行为。结果表明，PEEK／PEI共混物完全相容．所有共混物均呈现一个玻璃化转变温度(r， )，且与组分的关系符合Porch方程；随PEI含量的增加，共混体系的熔点、结晶度、整体结晶速率和结晶能力均降低：而PEEK的结晶度呈现先增加后减小的趋势， 当PEI质量分数为50％时，达到最大。

聚醚醚酮(PEEK)和聚醚酰亚胺(PEI)都是高性能聚合物，具有较高的耐热温度和优异的机械性能u J，作为工程塑料广泛应用于各领域 J。PEEK为半结晶性材料，其玻璃化转变温度( )为150 oC，熔点为340 oC左右，因此需要在较高的温度下进行加工，一般为370～400 oC。PEI是一种无定形材料，相对高的 (215 oC)和优异的机械性质是其优点；但由于PEI的耐溶剂性能相对较差，使其在工业应用领域，特别是航空应用方面受到限制 J。共混是开发新材料的一个重要方法，高分子混合物可以通过简便的方法得到，而所得的材料却具有混合组分所没有的综合性能l4 J。因此，将PEEK与PEI共混可以使二者的性质相互补充，对充分发挥材料的性能并拓宽应用范围有着现实的意义。但国内对PEEK／PEI共混物报道甚少。本文通过熔融挤出制得PEEK／PEI共混物，主要分析研究了两者的相容性和结晶行为，并采用一种简便的方法比较了不同组成共混物的结晶速率和结晶能力。

1 实验部分

1．1 主要原料及仪器

聚醚醚酮(PEEK)：粉末状， 粒径500目，长春吉大高新材料公司；聚醚酰亚胺(PEI)：Uheml000，颗粒状，GE公司。

差示扫描量热仪(DSC)：DSC 204F1，德国耐驰公司；x射线衍射仪(WAXD)：D8 Advance型，德国Bruker公司。

1．2 PEEK／PEI共混物的制备

将PEEK和PE1分别放于120℃烘箱中烘l h，然后按质量比(100／0，75／25，50／50，25／75和0／100)准确称量，熔融挤出，挤出温度为380℃ ，制得不同比例的PEEK／PEI共混物。

1．3 性能测试

DSC测试：吹扫气和保护气均为高纯氮气，流量分别为20 mL／min和60 mL／min；升温速率为10℃／min；样品量为5～10 mg。WAXD 测试：cu靶80。。

所有共混物均只检测到一个 ，表明该共混体系完全相容。这与PE1的结构有关，在PEI的酰亚胺基与对苯基间存在电荷转移相互作用。在PEEK／PEI共混物分子间的这种电荷转移相互作用有两种类型 5 J：一种是PEI和PE1分子间的作用(酰亚胺是电子受体，对苯基是电子给体)；另一种是PEI与PEEK分子间的相互作用(PEI的对苯基是电子受体，PEEK的对苯基是电子给体)。这两类相互作用彼此竞争，如果后一类相互作用比前一类强，则共混物相容；反之，不相容。另外，通过引入某些柔顺链节将分子链中两相邻酐环分离开，通常是降低一部分酐的电子亲和力。由于PEI二酐的长度较长，相应酐的部分亲和力较弱，即PEEK／PEI共混物PEEK与PEI间的相互作用占主导地位， 因而此共混体系是相容的。

，纯PEEK在升温过程中未出现结晶峰，而共混物均有结晶峰出现。这是由于PEI的加入使共混物的整体结晶能力和结晶速率降低，在熔体冷却过程中结晶不完全， 因此在升温过程中发生再结晶；且随PEI用量的增加，共混物的 ． 高，链段需要在更高的温度下才能发生运动，因而结晶也需在更高的温度下进行，从而使． 随PEI的增加而升高。

PEI 基础创新塑料(美国) 2400

PEI 基础创新塑料(美国) 2400

Polyetherimide, Polyetherimide referred to as PEI [1], is an amber transparent solid, without adding any additives have inherent flame retardancy and low smoke, oxygen index of 47%, combustion grade UL94-V-0 , The density is 1.28 ~ 1.42g / cm3. PEI has a strong high temperature stability, even non-enhanced PEI, still has a good toughness and strength. So the use of PEI superior thermal stability can be used to make high-temperature heat-resistant devices. With excellent mechanical properties, electrical insulation properties, radiation resistance, high and low temperature resistance and wear resistance, and through the microwave. PEI also has good flame resistance, chemical resistance and electrical insulation properties. Glass transition temperature is high, up to 215 ℃. PEI also has a very low shrinkage and good mechanical properties in the same direction. Adding glass fiber, carbon fiber or other filler can achieve the purpose of enhancing the modification; can also be composed of other engineering plastics heat polymer alloy, can be -160 ~ 180 ℃ operating temperature long-term use.

The US Underwriters Laboratories have specified that the long-term use temperatures of the polyether imide resins are 338T and 356T (depending on the grade) and the combustion rating is UL94V-0 (10 mil thickness). The oxygen index reaches 47, and the polyetherimide meets the aircraft Pieces of FAA required for flame retardancy and heat radiating material standards. Its glass transition temperature is 419F and is allowed to be intermittently used at 392F, resulting in short-term shifts at higher temperatures. At 356T, the stretching temperature and flexural modulus were above 41 and 2068 MPa, respectively. With glass fiber, carbon fiber reinforced materials have a higher strength and stiffness near glass transition temperature.

The long-term creep resistance of polyether imides at high temperatures and stresses allows them to replace metal and other materials in many structural equipment. In the variable temperature, moisture and frequency conditions show good electrical properties. The low loss factor at the GHz frequency gives the polyetherimide a high microwave wearability. Its ionic contaminants are low in the range of 250F100% R. H. And 207 kPa 120 hours after the extraction of water conductivity, more than 20 megohm, it can be used as an insulating material for electronic sensor components.

Polyether imide is an excellent coating and film-forming material that can form coatings and films suitable for use in the electronics industry and can be used to produce microporous membranes with a pore size of <0.1μm and a high permeability. Can also be used as high temperature adhesives and high strength fibers.

PEI board is non-crystalline plastic. Is an amorphous high-performance polymer, is made of amorphous PEI (polyether imide) made of engineering plastics extruded through the extruder at high temperature.

Because PEI has excellent comprehensive balance performance, it is used effectively in the industrial sectors such as electronics, motor and aviation, and used as a substitute for traditional products and cultural life of metal materials. The use of PEI instead of metal manufacturing fiber optic connectors, can optimize the structure of components, simplify its manufacturing and assembly steps, to maintain a more accurate size. For use in the automotive field, such as sensors (air conditioning temperature sensors) for controlling the external temperature of the car compartment and sensors (effective combustion temperature sensors) for controlling the temperature of the air and fuel mixture, for the manufacture of high temperature connections, high power lights and indicator lights. Can also be used as a high temperature resistant oil erosion of the vacuum pump impeller, 180 ° C operation of the burner of the grinding glass connector (socket), non-illuminated anti-fog lamp reflector.

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PEI 基础创新塑料(美国) 2400