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1. The slightly increased crosslink density of H1.4 in adequate to compensate the influence of the reduction in Xc. Thus the influence of Xc predominates. H1.4 略有增加的交联密度不足以补偿结晶度下降所带来的影响。所以结晶度的影响起主导作用。 2. When H is higher than 1.1, degradation rate increases evidently with H. 当H高于1.1时，降解速率随着H值增大而明显下降。 3. Nevertheless, in this system, the crosslink density does not retard degradation since the increase of crosslink density by increasing H is companied with a decrease in Mw and Xc, which may play dominant roles in the degradation. 然而，在现在这个体系中，交联密度没有使降解性能变差，这是因为交联密度增加伴随着分子量和结晶度的下降, 他们对降解起着主导作用。 4. while D residue that contains urethane groups degrades more slowly, due to the lack of the susceptible ester bonds. 而含有聚氨酯基团的D残留组分降解较慢，这是因为他们缺少易受攻击的酯键。 5. Biodegradation rate first decreases with increase of H up to 1.1, then increases with further increase of H. 6. Wang et al. studied the influence of H on molecular weight of copolymers containing of PBS and poly(L-lactic acid) when R-value is in the narrow range of 0.9 to 1.1 and found that maximum molecular weight was obtained at R-value of 1.0. 7. Therefore, extensive researches on P modification have been focused on the introduction of comonomers and change of the chemical structure by means of copolymerization. 因此，很多对P进行改性的研究集中于通过共聚引入共聚单体改变化学结构. [ Last edited by yuepeiiccas on 2010-4-1 at 17:31 ] |
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feynman
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5楼2010-04-02 13:18:54
zhills
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yuepeiiccas(金币+2):谢谢 2010-05-02 13:14
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1. The slightly increased crosslink density of H1.4 cannot adequately compensate the influence of the reduction in Xc. Thus the influence of Xc predominates. H1.4 略有增加的交联密度不足以补偿结晶度下降所带来的影响。所以结晶度的影响起主导作用。 2. When H is higher than 1.1, degradation rate decreases evidently with increase of H. 当H高于1.1时，降解速率随着H值增大而明显下降。 3. Nevertheless, in this system, the crosslink density does not degrade the performance, since the increase of crosslink density accompanies the decrease of Mw and Xc, which play dominant roles in the degradation. 然而，在现在这个体系中，交联密度没有使降解性能变差，这是因为交联密度增加伴随着分子量和结晶度的下降, 他们对降解起着主导作用。 4. while D residue that contains urethane groups degrades more slowly, due to the lack of the susceptible ester bonds. 而含有聚氨酯基团的D残留组分降解较慢，这是因为他们缺少易受攻击的酯键。 5. Biodegradation rate first decreases with increase of H up to 1.1, then increases with further increase of H. 6. Wang et al. studied the influence of H on molecular weight of copolymers containing of PBS and poly(L-lactic acid) when R-value is in the narrow range of 0.9 to 1.1 and found that maximum molecular weight was obtained at R-value of 1.0. 7. Therefore, extensive researches on P modification have been focused on the introduction of comonomers and the change of the chemical structure by means of copolymerization. 因此，很多对P进行改性的研究集中于通过共聚引入共聚单体改变化学结构. |
2楼2010-04-01 19:08:38
sammi_deng
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yuepeiiccas(金币+3):多谢 2010-05-02 13:12
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1. The slightly increased crosslink density of H1.4 is in adequate to compensate the influence of the reduction in Xc. Thus the influence of Xc has the dominant role to play. H1.4 略有增加的交联密度不足以补偿结晶度下降所带来的影响。所以结晶度的影响起主导作用。 2. When H is higher than 1.1, degradation rate increases dramatically with the increase of H. 当H高于1.1时，降解速率随着H值增大而明显下降。 3. Nevertheless, in this system, the crosslink density does not deviate the degradation since the increase of crosslink density accompanyed by the increasing H and the decrease in Mw and Xc, which may play dominant roles in the degradation. 然而，在现在这个体系中，交联密度没有使降解性能变差，这是因为交联密度增加伴随着分子量和结晶度的下降, 他们对降解起着主导作用。 4. However, D residue that contains the urethane groups degrades more slowly, due to the lack of the susceptible ester bonds. 而含有聚氨酯基团的D残留组分降解较慢，这是因为他们缺少易受攻击的酯键。 5. The rate of biodegradation first decreases with the increase of H up to 1.1, then increases with the further increase of H. 6. Wang et al. studied the influence of H on molecular weight of copolymers containing of PBS and poly(L-lactic acid) when R-value is in the narrow range of 0.9 to 1.1 and found that maximum molecular weight obtained at R-value of 1.0. 7. Therefore, extensive researches on P modification have been focused on the introduction of comonomers and the change of the chemical structure by means of copolymerization. 因此，很多对P进行改性的研究集中于通过共聚引入共聚单体改变化学结构. |
3楼2010-04-02 11:35:31
feynman
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4楼2010-04-02 13:14:50
