3C電子、電機、IT產品日新月異，快速推陳出新，使得其廢棄物的產量日益倍增，造成沈重的環境負擔。因此，歐盟著眼於電子、電機廢棄物量與質的整合管理，2006年發展出一系列的環保指令WEEE、RoHS、EuP，並要求各盟各會員國應在2007年8月完成國內立法程序，擬藉由歐盟龐大的單一市場力量，督促廠商建立綠色採購規範。為因應歐盟與環保的要求，研究探討上述材料回收再利用之可行方案已日異重要。
學術上藉由在實驗機上以小批量反復回收6~8次進行PC、ABS及PC/ABS Blends的物性及流變性之降解現象之驗證實驗，研究結果證實，加工之過程高分子材料受到熱及機械剪切力之作用，必然造成分子鏈斷裂而導致抗拉性能下降，玻璃轉移點(Tg)下降。然而，實際量產時材料遭受的熱、剪力及水份之影響與實驗機有甚大之差異。因此，本研究旨在純由量產加工程序建立材料降解之實測數據，並藉由改質劑之導入提昇回收材料使用之效率，以達成環保要求，並建立之最佳化”成效比”(成本/性能)之組成為本計劃之目的。
PC/ABS混合物（以下簡稱CS）被認為是PC或ABS的良好替代材料。為了了解CS重複循環再利用的可能性，我們以工業用量產設備將CS反複加工20次並進一步鑑定描述CS的熱、流變和機械行為的特性，並嘗試對已經經歷20次加工的CS進行改質，使其性能能夠達到CS新料原始性能的85%以上。由不同加工次數的CS熱重量損失(30% at 300-450oC and 40% at ~470oC)和Tg點(at ~100oC)的表現反映出CS具有相當高的熱穩定性。而由應力從4.71增加到5.23 kgf mm2、MI值從40增加到66 g (10 min)1) 、應變從27.2降低到11.7、耐衝擊強度從87.7降低到14.2 J m1、torque 從71降低到49 N m1)等現象研判，反復加工已使CS分子鏈斷鏈、並變得更硬。通過同時添加~30％（w / w）的PC、ABS新料、1.5％的（w / w）擴鏈劑以及2％的（w / w）苯乙烯馬來酸酐（SMA）能夠成功的恢復已重複加工20次的CS料的性能。本研究驗證能夠對已經經歷多次加工的PC合膠進行回收並回復其性能、同時兼顧環境保護的新方法。
聚碳酸酯（PC）/聚對苯二甲酸丁二醇酯（PBT）合膠（CB）同時兼具了PC和PBT的良好性能，因而被列入具有回收再生再利用價值的工程塑料之一。為了評估回收再加工CB的可能性，對0至20次回收再加工CB的物理和機械性能進行了分析評估，並試圖改質已回收再加工20次的CB使其性能達到CB新料性能的85％。基本上CB的熱重量損失（在300-450℃時為30％，在〜470℃時為40％）不會因回收再加工有明顯變化，反映了它們的高熱穩定性。隨回收加工的次數增加，熔化指數增加（從18.7到92.0

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克（每10分鐘）），但應力值（從6.08到4.99 kgf mm2不等）、應變（從79.0到29.1％）、衝擊強度（從144到14.7 J m-1）和扭矩值（從82到60 N m-1）下降、變硬，顯示CB在再回收再加工時會發生熱/機械分解。添加~30％（w / w）PC和PBT新料能成功的改質已回收再加工20次的CB。添加苯乙烯馬來酸酐和擴鏈劑未能改善再加工CB的應力值，可能是由於它們與PC和PBT分子的相互作用較弱的關係。

The drastically increasing quantity of waste generated caused by the rapid development of 3C products has a serious impact on the environment. For a better management of 3C product waste, the EU has not only developed a series of environmental protection directives e.g. WEEE, RoHS, and EuP, in 2006 but also requested all member states to complete their legislation before August 2007. In addition, the EU has also urged manufactures to build up green procurement specifications by taking advantage of the EU single market. To reflect the requirements laid down by the EU and for environmental protection, there is an increasing essence to explore the potential to recycle and reprocess the aforementioned materials.
In the laboratory, reprocessing 6 to 8 times in small batches was frequently performed for verifying the physical and rheological degradation of PC, ABS and PC/ABS blends. The research results have evidenced that the polymeric material is subjected to heat and mechanical shearing force during processing, resulting in the molecular chain break and, consequently, decreases in tensile properties and the glass transition point (Tg). Nevertheless, the effects induced by heat, shear force and moisture during actual mass production vary frequently largely from those in the laboratory test. Therefore, the objective of this study was (1) to quantify the degradation of polymeric materials during actual mass reprocessing, (2) to elevate the recycling and reprocessing efficiency of the polymeric materials via the introduction of modifiers for the purpose of environmental protection and (3) to optimise the “cost to performance ratio”.
PC/ABS blend (a.k.a CS) is one of the most popular engineering plastics to date, frequently considered as a good alternative to PC or ABS. To estimate the potential to recycle and reprocess CS, we characterised the thermal, rheological and mechanical behaviour of CS reprocessed 0 to 20 times in real industrial facilities and, furthermore, unprecedentedly attempted to modify the 20-time reprocessed CS until its functionality within 15% deviation from the virgin CS. Consistent thermal weight loss (30% at 300-450oC and 40% at ~470oC) and Tg points (at ~100oC) of CS from various cycles of reprocessing reflected the associated high thermal stability. However, increased stress values (from 4.71 to 5.23 kgf mm2) and melting index (from 40 to 66 g (10 min)1) but decreased stain (from 27.2 to 11.7 %), impact strength (from 87.7 to 14.2 J m1) and torque values (from 71 to 49 N m1) suggested that CS underwent

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polymer chain breaks during reprocessing and became stiffer. Recovery of the 20-time reprocessed CS was achieved by adding ~30% (w/w) virgin PC and ABS together with 1.5% (w/w) of chain extender and 2% (w/w) of styrene maleic anhydride (SMA) simultaneously. The study demonstrated the potential for recovering repeatedly reprocessed PC-based polymer blends and a new way of recycling polymer resource for environmental protection.
Polycarbonate (PC)/polybutylene terephthalate (PBT) blends (CBs) represent a good compromise between the properties of PC and PBT and are among the most popular engineering plastics today. To evaluate the capability of recycled and reprocessed CBs, the physical and mechanical properties of 0 to 20 times reprocessed CBs were characterised, and an attempt was made to modify a 20-time reprocessed CB to reach 85% of the functionality of a virgin CB. Generally, the thermal weight loss (30% at 300–450 °C and 40% at ~470 °C) of the CBs varied little with the reprocessing cycles, reflecting their high thermal stability. The increased melting index (from 18.7 to 92.0 g (10 min)1) but decreased stress values (from 6.08 to 4.99 kgf mm2), strains (from 79.0 to 29.1 %), impact strength (from 144 to 14.7 J m1) and torque values (from 82 to 60 N m1) with reprocessing cycles suggest that the CBs undergo thermal/mechanical decomposition when reprocessing and become thereafter stiffer. Satisfactory modification of the 20 times reprocessed CB succeeded simply via adding ~30% (w/w) virgin PC and PBT. Adding styrene maleic anhydride and a chain extender failed to improve the stress values of reprocessed CBs, probably due to their weak interaction with the PC and PBT molecules.

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