描述
PC塑料颗粒改性材料
特点：无卤阻燃，高流动性，高耐热性
用途：显示屏前框、后壳、笔记本电脑壳、电子电器等。
PC塑料颗粒改性材料
产品细节
聚碳酸酯塑料颗粒改性材料
由于聚碳酸酯主链中的软性碳酸盐基团和刚性苯环，聚碳酸酯大分子结构表现出刚性和柔性相结合的特点。Sub*构成主链的刚性部分，使PC具有更高的机械强度、耐热性和更高的尺寸稳定性。然而，sub*的存在阻碍了大分子的取向和结晶，在外力作用下不易松弛，难以消除残余内应力，容易导致产品应力开裂。同时，刚性基团也阻碍了大分子之间的相对滑动运动，从而提高了熔融温度和熔体粘度。含氧基团使链段易于围绕其单键旋转，并使大分子链具有一定的灵活性。这是PC具有更高冲击强度的原因之一；酯基是一个极性基团，它削弱了有机溶剂的稳定性，使其更容易溶解在极性有机溶剂中，这也是PC的电绝缘性能不如非极性PE，更容易水解的根本原因。PC大分子链具有对称性和规律性，理论上具有结晶能力。然而，由于PC大分子链的刚性，玻璃化转变温度高于产品的成型温度，成型过程中的熔体温度迅速降至玻璃化转变温度以下，没有时间结晶并成为无定形产品。因此，一般认为PC具有非晶态结构，具有良好的透明度，并且可以用作透明材料。然而，在合适的结晶条件下，PC也可以结晶。这就是PC产品在生产过程中经过热处理后透明度和韧性降低的原因
PC Plastic Pellet Modified Material
Features: halogen-free flame retardant,
high fluidity, high heat resistance.
Application: display front frame and back shell,
notebook shell, electronic appliances, etc.
PC Plastic Pellet Modified Material
Product Details
PC plastic pellet modified material
Because of the soft carbonate group and rigid benzene ring in the PC main chain, the PC macromolecular structure shows the characteristics of combining rigidity and flexibility. Sub* constitutes the rigid part of the main chain, which makes PC exhibit higher mechanical strength, heat resistance and higher dimensional stability. However, the existence of sub* hinders the orientation and crystallization of macromolecules, and it is not easy to relax after being forced by external force, which makes it difficult to eliminate the residual internal stress and easily causes stress cracking in the product. At the same time, the rigid group also hinders the relative sliding motion between the macromolecules, which increases the melting temperature and melt viscosity. The oxy group makes the chain segment easy to rotate around its single bond and gives the macromolecular chain a certain degree of flexibility. This is one of the reasons why PC has higher impact strength; the ester group is a polar group, which weakens the organic The stability in the solvent makes it easier to dissolve in polar organic solvents, which is also the basic reason that the electrical insulation performance of PC is inferior to that of non-polar PE and that it is easier to hydrolyze. The PC macromolecular chain has symmetry and regularity, and theoretically has the ability to crystallize. However, due to the rigidity of the PC macromolecular chain, the glass transition temperature is higher than the molding temperature of the product, the melt temperature during molding quickly drops below the glass transition temperature, and there is no time to crystallize and become an amorphous product. Therefore, it is generally believed that PC has an amorphous structure, has good transparency, and can be used as a transparent material. However, under suitable crystallization conditions, PC can also be crystallized. This is the reason why the transparency and toughness of PC products decrease after heat treatment during production.
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