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Zhu X.-N.,Zhejiang University | Song Y.-H.,Zhejiang University | Zheng Q.,Zhejiang University | Zheng Q.,National Engineering Research Center for Compounding and Modification of Polymeric Materials
Chinese Journal of Polymer Science (English Edition) | Year: 2012

A series of acrylate processing aid (ACR)-based ionomers with different lanthanide (La(III)) ion and acid contents were synthesized, and the interaction between ionomer and zinc stearate (ZnSt 2) was investigated immediately after thermally annealing the ionomer/ZnSt 2 (3/1 in weight) mixtures at 180°C. The results revealed that the ion groups in ionomer have a strong interaction with ZnSt 2. The annealed mixtures contained hot alcohol extractable and unextractable ZnSt 2. The melting of ZnSt 2 and the thermal behavior of the ionomer in the annealed mixtures were seriously influenced by the contents of La(III) and acid in the ionomers. The ionomer containing 0.25 mmol/g acid and 0.37 mmol/g La(III) has a detectable cluster phase. Annealing its ZnSt 2 mixture could break down the cluster phase and lower glass transition temperature of the ionomer matrix. However, washing away the extractable ZnSt 2 led to the reappearance of the cluster transition temperature and return of the glass transition temperature of matrix to the original position. © 2012 Chinese Chemical Society Institute of Chemistry, CAS Springer-Verlag Berlin Heidelberg.


Xu Y.,Southwest Jiaotong University | Chen M.,Southwest Jiaotong University | Chen X.-L.,Southwest Jiaotong University | Qin J.,Key Laboratory of Karst Drainage | Yu J.,National Engineering Research Center for Compounding and Modification of Polymeric Materials
Gongneng Cailiao/Journal of Functional Materials | Year: 2014

In this work, expandable graphite (EG), as a flame retardant, was filled into polypropylene/thermoplastic polyurethane (PP/TPU) composites. The influences of surface treatment on crystallization behavior, flammability and mechanical properties of PP/TPU with intumescent EG were studied by using DSC, CCT and SEM. The results showed that EG was an effective flame retardant, and titanate coupling agent could effectively improve the dispersion of EG particles in the PP/TPU composites; CCT data showed that expandable graphite after modification could reduce the heat release rate (HRR), total heat release (THR) and showed a good flame retardancy. The results from the mechanical property tests showed that PP/TPU/EG with surface treatment was greatly improved compared with unmodified ones. As for 20 phr MEG was added into PP/TPU, tensile strength and elongation at break were increased from 5.3 MPa and 17.6% to 5.6 MPa and 18.3% compared to untreated EG, respectively. Untreated EG promoted the nucleation on PP/TPU matrix. However, surface modifier could weak the effect of EG on PP/TPU composites.


Yang Y.-Y.,Zhejiang University | Zhang K.-Z.,National Engineering Research Center for Compounding and Modification of Polymeric Materials | Song Y.-H.,Zhejiang University | Zheng Q.,Zhejiang University
Chinese Journal of Polymer Science (English Edition) | Year: 2011

Environment friendly thermosetting composites were prepared by blending wheat gluten (WG) and rice protein (RP) at different weight ratios with glycerol as plasticizer followed by compression molding the mixture at 120°C to crosslink the proteins. Reducing agent of sodium bisulfate and sodium sulfite and crosslinking agent formaldehyde were used to adjust the properties of the composites. Morphology, moisture absorption and tensile properties were evaluated. The results showed that formaldehyde could increase tensile strength of the composites without significant influence on Young's modulus and elongation at break. On the other hand, reducing agents could improve tensile strength and extensibility simultaneously, which was much marked at WG/RP ratios from 7/3 to 3/7. © 2010 Chinese Chemical Society, Institute of Chemistry, Chinese Academy of Sciences and Springer-Verlag Berlin Heidelberg.


Zhu X.,Zhejiang University | Song Y.,Zhejiang University | Song Y.,National Engineering Research Center for Compounding and Modification of Polymeric Materials | Chen S.,Zhejiang University | And 3 more authors.
Polymer International | Year: 2011

An acrylate processing aid (ACR)-based ionomer containing lanthanide (La(III)) ion was synthesized and the influences of the ionomer on thermal stability, fusion time, transparency and tensile properties of rigid poly(vinyl chloride) (PVC) were investigated. Results revealed that the ionomer with a suitable La(III) content behaved as a good stabilizer as well as processing aid to the rigid PVC product. The ionomer could accelerate fusion of PVC much more quickly than ACR because of the strong interaction between La(III) carboxylate and PVC. Moreover, it exhibited a stabilizing efficiency comparable to lanthanum and calcium stearates (LaSt3 and CaSt2). The composite stabilizer of ionomer/zinc stearate (ZnSt2) exhibited an ability to improve initial discoloration better than LaSt3/ZnSt2 and CaSt2/ZnSt2 because the ionomer could form a complex with ZnSt2 much more slowly than LaSt3 and CaSt2. The compounds stabilized using ionomer/ZnSt2 exhibited a transparency comparable to those stabilized using organotin or liquid barium/zinc stabilizers, which was much better than those stabilized using LaSt3/ZnSt2 and CaSt2/ZnSt2. © 2011 Society of Chemical Industry.


Zhu X.,Zhejiang University | Song Y.,Zhejiang University | Song Y.,National Engineering Research Center for Compounding and Modification of Polymeric Materials | Zheng Q.,Zhejiang University | Zheng Q.,National Engineering Research Center for Compounding and Modification of Polymeric Materials
Journal of Applied Polymer Science | Year: 2012

A type of lanthanide (La(III))-containing ionomer based on acrylate processing aid (ACR) for poly (vinyl chloride) (PVC) was synthesized, and influence of the ionomer on thermal stabilization of PVC was investigated with visual color comparison and Congo red methods. Results revealed that the ionomer with a suitable La(III) content behaved as a good costabilizer to PVC. It was able to extend static stabilization time of PVC and postpone "zinc burning." The stabilizing efficiency of the ionomer to PVC depended on ion content, which was discussed in terms of Eisenberg-Hird-Moore model. Moreover, Fourier transform infrared test verified that this ionomer can react with zinc stearate (ZnSt 2) to form some new structures, which is responsible for postponing "zinc burning." The ionomer and epoxidized soybean oil exhibited a synergistic effect on the stabilizing efficiency of calcium stearate (CaSt 2)/ZnSt 2 stabilizer to PVC compounds. © 2012 Wiley Periodicals, Inc.

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