簡單形式的透明的苯乙烯-馬來酸酐共聚物(S—MA)是通過苯乙烯單體與少量的馬來酸酐單體反應(yīng)制得的。馬來酸酐單體無規(guī)地接到PS主鏈上，增加了玻璃化轉(zhuǎn)變和熱變形溫度。一般苯乙烯-馬來酸酐共聚物產(chǎn)品的熱變形溫度都超過260°F。在注塑成型時，即使溫度超過550°F時，這種聚合物的性能仍然相當(dāng)穩(wěn)定。
The simple form of transparent styrene maleic anhydride copolymer (s-ma) is prepared by the reaction of styrene monomer with a small amount of maleic anhydride monomer. The maleic anhydride monomer is randomly connected to the PS main chain, which increases the glass transition and thermal deformation temperature. Generally, the thermal deformation temperature of styrene maleic anhydride copolymer products exceeds 260 ° F. During injection molding, the properties of this polymer are quite stable even when the temperature exceeds 550 ° F.
在反應(yīng)階段，橡膠段接校在聚合物上，可以使之具有很好的韌性。在許多工程應(yīng)用中，為了滿足韌度要求，這一過程是關(guān)重要的。
In the reaction stage, the rubber segment is connected to the polymer, which can make it have good toughness. In many engineering applications, this process is very important to meet the toughness requirements.
在許多應(yīng)用中，需要通過玻璃纖維補強來增加苯乙烯-馬來酸酐共聚物的強度和硬度。在通過化學(xué)方法處理的玻璃纖維表面和高極性的馬來酸酐組分之間，化學(xué)偶合可以很容易進行并且耐久。這種良好的粘合可以通過電子顯微鏡觀察其復(fù)合材料的斷口，而得到充分的證實。
In many applications, glass fiber reinforcement is needed to increase the strength and hardness of styrene maleic anhydride copolymer. The chemical coupling between the chemically treated glass fiber surface and the highly polar maleic anhydride component can be easily carried out and durable. This good adhesion can be fully confirmed by observing the fracture of the composite by electron microscope.
這種粘合性可以使其強度、模量、韌性(甚長期暴露在惡劣環(huán)境下)保持長期不變。性能穩(wěn)定化的產(chǎn)品，在溫度超過235°F、經(jīng)過2000hr后，其主要的強度和韌性幾乎沒有損失。由苯乙烯-馬來酸酐共聚物制成的汽車外部構(gòu)件，在汽車使用壽命期內(nèi)，充分保證了乘客的性。這一點是關(guān)重要的。
This adhesion can keep its strength, modulus and toughness (even long-term exposure to harsh environment) unchanged for a long time. The main strength and toughness of the products with stable performance almost have no loss after the temperature exceeds 235 ° F and 2000hr. The automobile exterior components made of styrene maleic anhydride copolymer fully ensure the safety of passengers within the service life of the automobile. This is crucial.
