The plastification modification of poly （vinyl chloride） （PVC） with the long-chain linear polyester （LP） synthesized by linear dodecanedioic acid （DC12） or tetradecanedioic acid （DC14） with different diols i...The plastification modification of poly （vinyl chloride） （PVC） with the long-chain linear polyester （LP） synthesized by linear dodecanedioic acid （DC12） or tetradecanedioic acid （DC14） with different diols is investigated. The processing characteristics, mechanical properties and extraction property of the PVC/LP blends in different solvents （xylene, cyclohexane, ethanol） were also studied in detail. All results were compared with that of the PVC plasticized with dioctyl phthalate （DOP）. The results show that the molecular weight, molecular structure and loading of LP greatly influence the mechanical properties of the PVC/LP blends. The processability and the mechanical properties of PVC plasticized by LP are comparable to those of the corresponding PVC/DOP blends. However, the PVC/LP blends posses much better migration resistance property than the corresponding PVC/DOP blends, which makes the long-chain linear polyester become a very good plasticizer candidate for PVC industry.展开更多
Biobased urea nowadays attracts increasing attention as a biomass resource with giant potential,which benefits from the development of biobased ammonia and ecological sanitation system.Urea is an ideal feedstock for c...Biobased urea nowadays attracts increasing attention as a biomass resource with giant potential,which benefits from the development of biobased ammonia and ecological sanitation system.Urea is an ideal feedstock for chemical industry and developing new urea-based polymer materials can take advantage of the urea resource.In this work,a class of renewable linear polyesters,namely polyisocyanuratoesters(PICEs)were synthesized from a urea-based monomer bis(2-carbomethoxyethyl)isocyanurate and biobased aliphatic diols.Compared with conventional aliphatic polyesters,PICEs containing isocyanurate rings in the polymer chain backbone exhibit outstanding flame retardancy that both PICE-4(the number‘4’refers to the number of methylene in diols,e.g.4 for butylene and 6 for hexylene)and PICE-6 have high limiting oxygen index values over 30%.In the UL 94 tests,PICE-6 reaches V-1 rating;while V-2 is found for PICE-10.All PICEs exhibit similar pyrolysis behavior that the temperatures of 5%weight loss are around 320°C.PICEs are found to have glass transition among 20°C-45°C.No crystallization behavior is observed without annealing except for PICE-10,which can crystallize even at room temperature.展开更多
以端羟基超支化聚酯(CHBP_x)和顺丁烯二酸酐为原料,合成端羧基线性-超支化聚酯(MHBP_x),并进行中和反应,制备出阴离子型加脂剂.通过测定顺丁烯二酸酐反应率,优化出合成MHBP_x的反应条件为:顺丁烯二酸酐与CHBP_x的摩尔比为1.4∶1,反应温...以端羟基超支化聚酯(CHBP_x)和顺丁烯二酸酐为原料,合成端羧基线性-超支化聚酯(MHBP_x),并进行中和反应,制备出阴离子型加脂剂.通过测定顺丁烯二酸酐反应率,优化出合成MHBP_x的反应条件为:顺丁烯二酸酐与CHBP_x的摩尔比为1.4∶1,反应温度为90℃,反应时间为4h.在该条件下,制备得到了三代产物(MHBP_1、MHBP_2、MHBP_3),并通过FTIR和1 H NMR等手段表征了MHBP_x的分子结构,并具有一定的稳定性,使用激光粒度分析仪测量MHBP_1、MHBP_2、MHBP_3乳液平均粒径为123.8nm、348.9nm和412.1nm.将MHBP_x应用于绵羊皮加脂工艺,并与市售加脂剂SK-70对比,考察了三代产品对成革增厚率、部位差降低率、柔软度、机械强度以及透水汽性的影响,结果表明,该类产品具有提高成革柔软度与撕裂强度的性能.展开更多
基金the Engineering Developing Foundation of Tongji University
文摘The plastification modification of poly （vinyl chloride） （PVC） with the long-chain linear polyester （LP） synthesized by linear dodecanedioic acid （DC12） or tetradecanedioic acid （DC14） with different diols is investigated. The processing characteristics, mechanical properties and extraction property of the PVC/LP blends in different solvents （xylene, cyclohexane, ethanol） were also studied in detail. All results were compared with that of the PVC plasticized with dioctyl phthalate （DOP）. The results show that the molecular weight, molecular structure and loading of LP greatly influence the mechanical properties of the PVC/LP blends. The processability and the mechanical properties of PVC plasticized by LP are comparable to those of the corresponding PVC/DOP blends. However, the PVC/LP blends posses much better migration resistance property than the corresponding PVC/DOP blends, which makes the long-chain linear polyester become a very good plasticizer candidate for PVC industry.
基金The authors are grateful for the financial supports of the National Science Foundation of China(21404040)the Fundamental Research Funds for the Central Universities(2015ZM053)the State Key Laboratory of Pulp and Paper Engineering(201538).
文摘Biobased urea nowadays attracts increasing attention as a biomass resource with giant potential,which benefits from the development of biobased ammonia and ecological sanitation system.Urea is an ideal feedstock for chemical industry and developing new urea-based polymer materials can take advantage of the urea resource.In this work,a class of renewable linear polyesters,namely polyisocyanuratoesters(PICEs)were synthesized from a urea-based monomer bis(2-carbomethoxyethyl)isocyanurate and biobased aliphatic diols.Compared with conventional aliphatic polyesters,PICEs containing isocyanurate rings in the polymer chain backbone exhibit outstanding flame retardancy that both PICE-4(the number‘4’refers to the number of methylene in diols,e.g.4 for butylene and 6 for hexylene)and PICE-6 have high limiting oxygen index values over 30%.In the UL 94 tests,PICE-6 reaches V-1 rating;while V-2 is found for PICE-10.All PICEs exhibit similar pyrolysis behavior that the temperatures of 5%weight loss are around 320°C.PICEs are found to have glass transition among 20°C-45°C.No crystallization behavior is observed without annealing except for PICE-10,which can crystallize even at room temperature.
文摘以端羟基超支化聚酯(CHBP_x)和顺丁烯二酸酐为原料,合成端羧基线性-超支化聚酯(MHBP_x),并进行中和反应,制备出阴离子型加脂剂.通过测定顺丁烯二酸酐反应率,优化出合成MHBP_x的反应条件为:顺丁烯二酸酐与CHBP_x的摩尔比为1.4∶1,反应温度为90℃,反应时间为4h.在该条件下,制备得到了三代产物(MHBP_1、MHBP_2、MHBP_3),并通过FTIR和1 H NMR等手段表征了MHBP_x的分子结构,并具有一定的稳定性,使用激光粒度分析仪测量MHBP_1、MHBP_2、MHBP_3乳液平均粒径为123.8nm、348.9nm和412.1nm.将MHBP_x应用于绵羊皮加脂工艺,并与市售加脂剂SK-70对比,考察了三代产品对成革增厚率、部位差降低率、柔软度、机械强度以及透水汽性的影响,结果表明,该类产品具有提高成革柔软度与撕裂强度的性能.
