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Zhuang T.,Key Laboratory of Rubber plastics QUST | Shan T.,Qingdao University of Science and Technology | Zhou L.,Key Laboratory of Rubber plastics QUST
Advanced Materials Research | Year: 2010

To study the effection of nano-ZnO on thermal oxidative aging and ultraviolet radiation aging of NR, and the mechanisms of thermal oxidation aging and ultraviolet radiation aging of nano ZnO in NR were explained by TG and stress relaxation and ultraviolet analysis. The results revealed that nano-ZnO can improve the anti-thermal oxidation aging and anti-ultraviolet radiation aging of NR, and the protective effect improves with the increase dose of nano-ZnO. © (2010) Trans Tech Publications.


Shan T.,Qingdao University of Science and Technology | Zhuang T.,Key Laboratory of Rubber plastics QUST | Zhou L.,Key Laboratory of Rubber plastics QUST
Advanced Materials Research | Year: 2010

The application of activated zinc oxide compared with ordinary zinc oxide in sole rubber was investigated. The experiment showed that activated zinc oxide could improve the microstructure and cross-linking degree of cross-linked rubber, the tensile strength at 100% elongation and at 300% elongation. The ageing resistance increased by 12%. With the amount of activated zinc oxide increased, the modulus at 100% elongation, the modulus at 300% elongation and shore hardness assumed increased, but the elongation at break, tear strength, the ageing resistance presented dropped. © (2010) Trans Tech Publications.


Yongzhen L.,Key Laboratory of Rubber plastics QUST | Yongzhen L.,Key Laboratory of Tropical Crop Products Processing | Jidong H.,Key Laboratory of Rubber plastics QUST | Guozhen C.,Key Laboratory of Rubber plastics QUST | And 2 more authors.
Journal of Applied Polymer Science | Year: 2010

Polymorpholine-2,5-dione-block-polylactide (PMD-b-PLA) was synthesized via two-step anionic ring-opening polymerization at room temperature. First step of ring-opening polymerization was the ring-opening of mor-pholine-2,5-dione (MD). It was carried out in an airtight and dry polymerization tube using potassium ethoxide/THF (0.2M/L) as an initiator for 90 min. Then lactide was ring-opened in THF solution by the potassium alcoholate of PMD. From the FTIR of the copolymer, we can find all the peaks in PLA and PMD. The 1H-NMR of copolymer gave us a proof to the principle of the anionic ring-opening polymerization and the fraction of PMD in the copolymer was calculated as 86.3%. DSC analysis of copolymer indicated that it was a copolymer with one T g (63.6°C) and two T ms (155.6 and 171.4°C) instead of a mixture of PMD and PLA. The yields of the PMD and the copolymer were 32 and 26%, respectively. © 2010 Wiley Periodicals, Inc.


Yao W.,Key Laboratory of Rubber plastics QUST | Shao H.,Key Laboratory of Rubber plastics QUST | Sun J.,Key Laboratory of Rubber plastics QUST | He A.,Key Laboratory of Rubber plastics QUST | And 2 more authors.
Polymer Bulletin | Year: 2014

Morphology, curing characteristics, mechanical and dynamic properties of vulcanization of epoxidized trans-polyisoprene (ETPI) with different epoxy content were investigated. From scanning electron microscopy micrographs, it is observed that ETPI vulcanizates were a two-phase system. DSC shows that the residual crystallization reduced with increasing epoxy content. With increasing epoxy content, the induction period of cure shortened gradually as well as tensile strength, elongation at break, hardness and tear strength decreased. It is important to note that the wear resistance increased gradually with the increasing of epoxy content. Rebound values at 23 and 70 °C decreased which indicate that damping capacity and wet resistance performance increased, but the rolling resistance increased. DMA tests further show that wet resistance performance enhanced, damping capacity improved, but rolling resistance increased with increasing epoxy content of ETPI. © 2014, Springer-Verlag Berlin Heidelberg.


Zhang Y.,Key Laboratory of Rubber plastics QUST | Ren P.,Key Laboratory of Rubber plastics QUST | Zhang H.,Key Laboratory of Rubber plastics QUST | Guo E.,Key Laboratory of Rubber plastics QUST | Yang W.,Key Laboratory of Rubber plastics QUST
Journal of Luminescence | Year: 2010

This study reports the synthesis and the two-photon absorption (TPA) properties of a series of 9,10-anthracene-centred oligo(p-phenyleneethynylene)s with end-capping didecylamine. The results show that both the maximal TPA cross-sections (δ max) and the fluorescence quantum yields (Φ) of the oligomers increase with the extension of phenylethynyl bridges. Interestingly, the Φδ max per repeating unit to is obviously enhanced by extending linearly conjugation size of the oligomers. Moreover, these oligomers all show the maximal two-photon absorption cross-sections at 800 nm and emit strong green to yellowish-green two-photon excited fluorescence. These materials may find applications in which two-photon excited fluorescence and photo-induced electron transfer are utilized. Crown Copyright © 2009.

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