双噁唑啉类扩链剂增黏回收的PET的研究  

Chain Extension of Recycled PET with Bisoxazoline Chain Extenders

作　　者：刘波[1,2] 许乾慰[1,2] 

机构地区：[1]先进土木工程材料教育部重点实验室,上海201804 [2]同济大学材料科学与工程学院,上海201804

出　　处：《上海塑料》2012年第4期25-30,共6页Shanghai Plastics

摘　　要：从扩链剂用量、反应时间分别研究了2,2-双(2-噁唑啉)(BOZ)与2,2-(1,3-苯撑)-双(2-噁唑啉)(PBO)对回收的聚对苯二甲酸乙二醇酯(PET)的扩链效果。结果表明:扩链剂量为理论量的3倍,反应时间为4～6min时获得最大扩链效果。其中BOZ对PET特性黏数的提高效果较好,从0.61提高到0.80。利用红外差减光谱分析了BOZ与PET的扩链反应前后的结构变化,酰胺基团出现以及酯基增加、羧基减少证实了扩链反应的发生;而五元环的存在则表明反应过程是分两步进行的。利用差示扫描量热分析仪分析了残余扩链剂对产物热性能的影响;当扩链剂的添加量较低时,熔融过程中产物的相对分子质量进一步提高,结晶度下降;而当扩链剂添加量较高时,相对分子质量反而下降,结晶度上升。The chain extension of the recycled poly（ethylene terephthalate）（PET） using 2,2-bis（2-oxazo- line）（BOZ） and 2,2-（1,3-phenylene）-bis（2-oxazoline）（PBO） as the chain extenders from the perspec- tive of added amount and reaction time was studied. The results showed that the highest intrinsic viscos- ity arose when the added amount was 3 times over the theoretical amount and the reaction time was 4- 6 min. BOZ got better results and improved the intrinsic viscosity of recycled PET from 0.61 to 0.80. Fourier transform infrared subtractive spectrum was used to characterize the structure changes after the reaction between recycled PET and BOZ. The chain extension reaction can be confirmed through the ap- pearance of amide groups, the increase of ester groups and the decrease of carboxyl groups. The pres- ence of a five-membered ring confirmed that it takes 2 steps to complete the chain extension reaction. The differential scanning calorimetry was used to analyze the influence of residue BOZ upon the thermal performance of the products. The product met a further increase in relative molecular mass and a de- crease in crystallinity at a relatively lower BOZ added amount, and the situation is just opposite at a higher BOZ added amount.

关 键 词：聚对苯二甲酸乙二醇酯 扩链剂 特性黏数 差减光谱 

分 类 号：TQ323.4[化学工程—合成树脂塑料工业]