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分峰计算结晶度的问题探讨 总被引：1，自引：0，他引：1
应用分峰方法计算结晶度,首要条件是结晶聚合物的形态结构必须符合"两相模型"。通过聚合物材料的分析,发现Jade软件的分峰程序固然很好,但其受到扫描范围、基线、非晶峰位置及分布的影响很大,计算的结晶度值有一定的随意性,只能作相对比较,且结晶度值偏大。用X射线衍射法测定的结晶度与其他实验方法获得的结晶度无可比性,还常遇到背景散射的基线不平和非晶峰难以确定等现象。对此进行探讨和交流。 相似文献
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Frauke Gr?ter 《中国科学院院刊(英文版)》2014,(2):195-197
<正>The Group on Protein Mechanics and Evolution at the CAS-MPG Partner Institute for Computational Biology,Shanghai,was established in January 2007 and headed by Dr.Frauke Gr?ter.The Klaus Tschira Lab has continued the eff orts of this former Independent Junior Research Group,since Dr.Gr?ter took up a position at the Heidelberg Institute of Theoretical Studies(HITS)in Heidelberg,Germany,in 相似文献
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为了降低包晶钢铸坯表面纵裂纹发生率,需要优化现有包晶钢保护渣的传热性能。热流密度数值直接反映传热性能。通过选取某钢厂使用的A、B、C、D、E、F六种包晶钢保护渣,经过对比得出A渣具有较低的热流密度。从影响热流密度的碱度、结晶度、结晶温度三个因素进行分析,发现保护渣高碱度(不低于1.4),高结晶率,高结晶温度有利于降低保护渣的热流密度。 相似文献
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ＩＮＴＲＯＤＵＣＴＩＯＮＴｈｅｍｅｃｈａｎｉｃａｌｐｒｏｐｅｒｔｉｅｓｏｆｐｌａｓｔｉｃｉｚｅｄＰＶＣａｒｅｖｅｒｙｓｔｒｏｎｇｅｖｅｎｉｆｔｈｅｍａｔｅｒｉａｌｉｓｕｓｅｄｗｅｌｌａｂｏｖｅｉｔｓｇｌａｓｓｔｒａｎｓｉｔｉｏｎｔｅｍｐｅｒａｔｕｒｅ(Ｔｇ).Ｔｈｅｆｌｏｗａｎｄｖｉｓｃｏｅｌａｓｔｉｃｂｅｈａｖｉｏｒａｒｅｓｉｍｉｌａｒｔｏｔｈａｔｏｆａｌｉｇｈｔｌｙｃｒｏｓｓｌｉｎｋｅｄｒｕｂｂｅｒ.Ｔｈｉｓｈａｓｂｅｅｎｔｈｅｓｕｂｊｅｃｔｏｆｍｕｃｈｄｅｂａｔｅ,ｂｕｔｔｈｅｍｏｓｔｒｅａｓ… 相似文献
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A series of high molecular weight PVC (HMW-PVC) resin was synthesized by suspenion process at various temperatures and compounded
to prepare plasticized HMW-PVC. Plasticized HMW-PVC is physically crosslinked by microcrystallites and chain entanglements.
The molecular weight and degree of crystallinity of PVC resin increase with decrease of polymeri-zation temperature. More
dense physical crosslinking networks are formed in plasticized PVC with the decrease of polymerization temperature of PVC
resin. Plasticized HMW-PVC exhibits thermal reversible processability, but the gelation temperature and melt viscosity increase
with increasing physical crosslinking density. Physical crosslinking also has great effects on the mechanical properties of
plasticized HMW-PVC. The compression set and deformation decrease as molecular weight and crystallinity of PVC resin increase,
but the softening temperature and tensile strength increase. The crosslinking network of plasticized HMW-PVC is more similar
to the dissociable network of gels than to the permanent network of crosslinked rubber and is not stable under stretching
at high stress. 相似文献
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用光学解偏振法测定了2.6—PEN的结晶速度的温度依赖性,得出其快结晶速度区域是在180℃至230℃之间,而在低于180℃或高于230℃的温度区域,结晶速度都是慢的。测定了不同结晶度试样的动态力学—温度谱,用以研究其结晶行为,得出α损耗峰随结晶度的变化。此外,将上述各实验结果与同法测定的PET的结果进行了对比,发现2.6～PEN与PET的结晶行为的相似性。 相似文献
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