德国科思创PC 6555---After drying, the PC can absorb moisture ,and the moisture has a large diffusion rate in the PC) to testwhether the drying is or not: (1) the "air injection"method is adopted on the injection molding machine: the materialflowing out from the nozzle is uniform white, and it is if there are no silver lines and bubbles; (2) several driedgranules were sandwiched between the slides at about 270 ℃; If themolten material does not start, it is considered ; PC iseasy to degrade at high temperature. The melt temperature of PCshould be strictly controlled below the decomposition temperatureto avoid the degradation of PC at high temperature. The residencetime of materials should not be too long. When there areimpurities, the degradation will be accelerated. PC is generallyconsidered as amorphous polymer because of its low crystallinity,so its molding shrinkage is relatively small, which is about 0.5 ~0.8%
PC经干燥后能很快再吸附湿气，而且湿气在PC中有较大的扩散速率）检验干燥是否合格：⑴在注塑机上采用“对空注塑”法：从喷嘴流出的物料是均匀白色，无银纹和气泡即为合格；⑵将干燥好的几个粒料夹在约270℃的载玻片之间；在上面轻缓加压使粒子变扁，如熔料不出现起跑认为是合格；高温下PC易降解，成型时应把PC的熔体温度严格控制在分解温度以下以避免PC在高温下降解，且物料的停留时间不宜过长，当有杂质存在时会加速降解。PC的结晶能力较小，一般被认为是无定形聚合物，因而成型收缩率较小，约在0.5~0.8%之间.
目前采用共混方法对PC进行改性已取得显著成效。可与PC共混的聚合物很多，如ABS、PE、PP、聚异丁烯、PS、AS、丁腈胶、PET、聚氨酯、PTFE、POM、PPO、PPS、聚砜、氯化聚醚、丙烯酸树脂等,PC与ABS共混物是早工业化生产的一种PC改性产品，将二者充分干燥后在密炼机或双辊筒混炼机中熔融共混制得的。随ABS含量↑，成型加工性能得到改善，成型温度下降，流动性好，但力学性能有所下降.
At present, PC has been modified by blending method, andremarkable results have been achieved. There are many polymers thatcan be blended with PC, such as ABS, PE, PP, polyisobutylene, PS,as, nitrile butadiene rubber, pet, polyurethane, PTFE, POM, PPO,PPS, polysulfone, chlorinated polyether, acrylic resin and so on.PC and ABS Blend is one of the earliest PC modified products inindustrial production. They are fully dried and then melt blendedin internal mixer or double roller mixer. With the increase of ABScontent, the processability is improved, the molding temperature isdecreased, the fluidity is good, but the mechanical properties aredecreased
