999 resultados para G-funktio


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用熔融接枝方法制备了聚丙烯-g-丙烯酸(PP-g-AA)。用光电子能谱,广角X射线衍射,红外光谱和化学滴定方法对接枝物进行了定性和定量表征。讨论了单体和引发剂浓度对接枝率的影响,确定了用红外光谱法测定接枝物含量的经验公式

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利用聚丙烯等离子体接枝甲基丙烯酸甲酯共聚物(PP-g-PMMA)作增容剂,研究了其在聚丙烯/聚偏氟乙烯(PVDF)共混体系中的作用。增容是通过PMMA与PVDF的偶极-偶极相互作用实现的。接枝共聚物使共混体系的抗张强度和模量均有提高,由不同等离子体处理时间所得的PP-g-PMMA,接枝率在7.7%~300%具有最好的增容效果;而由不同后聚合时间所得的共聚物,接枝率在30%~80%具有最好的增容效果。

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本文用DSC研究了乙丙共聚物接枝甲基丙烯酸环氧丙酯(EP-g-GMA)的热学性质。与空白乙丙共聚物相比,接枝共聚物中丙烯序列的结晶温度升高了8~12℃,熔融热焓增加了4~6J/g。乙烯序列的结晶温度却稍有下降,其相应熔点及熔融热熔都有相应下降。等温与非等温结晶动力学表明接枝样品中丙烯序列的结晶速率高于相应的未接枝样品,EP-g-GMA的Avrami指数及Ziabicki指数均高于空白EP,接枝到乙丙共聚物乙烯序列上的甲基丙烯酸环氧雨酯(GMA)可能成为丙烯序列结晶的成核剂,加速了丙烯的成核速度和晶体增长速度。

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利用扫描电子显微镜、偏光显微镜对尼龙6/马来酸酐接枝SBS共混物的形态结构进行了研究,对其力学性能、吸水率进行了测试和表征。结果表明,用马来酸酐接枝的SBS与尼龙6有较好的相容性,其室温和低温下的缺口冲击强度比纯尼龙6有大幅度提高,吸水率有所降低。

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Synthesis and characterization of a diamino dihydroxyl azo compound were reported, The crosslinking reaction process of the diamino dihydroxyl azo compound with the biuret of hexamethylene diisocyanate was studied by FTIR, The glass transition temperatures of crosslinked polymers were measured by DSC, The orientation and oriented stability of crosslinked and poled polymers were studied by UV-Vis spectra.

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The glass transition behaviour, microphase separation morphology and crystallization of poly(vinyl alcohol)-g-poly(methyl methacrylate) graft copolymers (PVA-g-PMMA) were studied. A lamellar microphase separation morphology was formed, even for a copolyme

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A new graft copolymer (PP-MA)-g-PEO was synthesized by means of the chemical reaction between maleated polypropylene (PP-MA) and mono hydroxyl poly(ethylene oxide) (PEO-OH). The effect of reaction conditions on the degree of grafting of PEO-OH was studied

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最近,关于用接枝或嵌段共聚物作为增容剂来提高不相容聚合物共混体系相容性的研究越来越受到人们的重视因为这是开发新型高性能聚合物材料最简单最有效的方法之一.通常,适当选择接枝或嵌段共聚物,其链段可能同相应相区的链段相同,或者同某一相相容,因而可起到界面剂的作用:减小不相容组分的界

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合成了端丙烯酰胺基聚(β-胺基两酸)大分子单体,用端基滴定法和1H—NMR法测定了大分子单体的分子量,用13C—NMR和氢氧化钠水解法测定了支化度.在水溶液中用硫酸亚铁/异丙苯过氧化氢氧化还原引发体系引发丙烯酸胺、丙烯酸钠与聚(β-胺基丙酸)大分子单体的共聚反应,合成了聚(丙烯酰胺-co-丙烯酸钠)-g-聚(β-胺基丙酸)接枝共聚物.用1H—NMR和滴定法测定了接枝共聚物的组成.溶液性质的数据表明,与部分水解聚丙烯酰胶相比,聚(β-胺基丙酸)含量较高的接枝共聚物具有较好的耐盐性和优异的贮存稳定性.

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本文给出了原子和离子能量表达式中的库仑积分与交换积分系数fk、gk的计算方法,同时给出了计算中所涉及的Racah系数、U(k)、V(lk)和C(k)‘矩阵等光谱参量的计算方法,用FORTRANw语言编写了关于fk和gk的计算机程序,只要输入与光谱项有关的量子数,即可迅速得到相应的kf、gk值,避免了烦琐的人工推算。

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通过粘度的测量,考察了壳聚糖在不同条件下经不同剂量γ射线辐照所引起的分子量的变化,并分别计算了真空和空气中壳聚糖辐射裂解的G(S)值。

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合成了聚乙烯醇-g-聚丙烯酸接枝聚合物(PVA-g-PAA),分别用KOH、NaOH、LiCl的乙醇-水溶液处理PVA-g-PAA膜。发现离子膜用于乙醇-水的渗透气化分离可以大幅度提高分离系数,特别是用KOH处理,分离系数可达400。

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本文给出了原子和离子能量表达式中的库仑积分与交换积分系数f~k与g~k的计算方法,同时给出了计算中所涉及的Racah系数、U~(k)、V~(lk)和C~(k)矩阵等光谱参量的计算方法,我们用FORTRAN语言编写了关于f~k与g~k的计算机程序,只要输入与光谱项有关的量子数,即可迅速得到相应的f~k与g~k值,避免了烦琐的人工推算。

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利用~(60)Co辐照合成了HDPE与丁二烯的接枝共聚物,PE-g-PB。动态力学试验表明,它与PB较PE与PB有更好的相容性。PB含量相同时PB/PE-g-PB共混物比PB/PE共混物有较高的抗张强度和断裂伸长率。前者中两相分布较均匀,相区尺寸较小。

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Financial support from the Ministry of Science and Technology of China (2010CB833802 and 2007AA09Z446) and from the National Science Foundation of China (30910103914) is gratefully acknowledged.