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On the Structure and Free Volume Properties of Poly(3-hydroxybutyrate-co-3-hydroxyvalerate) Membranes via Various Crystallization Conditions
关键字：positron annihilation lifetime, free volume, crystallization temperature, rigid amorphous fraction, long period.
The crystalline structure and the free volume properties within the amorphous phase of poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) membranes depend on the preparation conditions. The difference of free volume properties among various PHBV mem...
http://www.polymer.cn/research/dis_info10753 |
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新型植物性聚酯PDHCA-co-PHA的合成与性能研究
关键字：植物性聚酯
使来源于天然植物的3，4-二羟基肉桂酸(DHCA)和对羟基苯甲酸 (HA) 在200℃下进行熔融缩聚[1~3]，制得了新型聚酯（PDHCA-co-PHA），用核磁共振（1H-NMR），傅立叶红外(FTIR)光谱和凝胶渗透色谱(GPC)对PDHCA-co-PHA 的结构与相对分子量进行了表征，结果表明所合成的共聚物结构明确。通过差示扫描量热（DSC）和X-射线衍射（XRD）研究了共聚物的热性能与结晶性能，结果表明：PDHCA-co-PHA 的玻璃化转变温度(Tg)随HA...
http://www.polymer.cn/research/dis_info9422 |
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Swelling mechanism of porous P(VP-co-MAA)/PNIPAM semi-IPN hydrogel with different pore sizes prepared by freeze-treatment
关键字：swelling mechanism, microstructure, freeze-treatment, diffusion coefficient, fickian Law
The objective of this paper is to investigate the effect of the microstructure of the gel on the swelling mechanism. So, a series of porous gel with different pore sizes were prepared by freeze-treatment conventional hydrogel...
http://www.polymer.cn/research/dis_info8605 |
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EFFECT OF Mg-Al LAYERED DOUBLE HYDROXIDE ON THERMAL PROPERTIES OF EMAA NANOCOMPOSITES VIA MELT COMPOUNDING
关键字：layered double hydroxide; poly(ethylene-co-methacrylic acid); nanocomposites;melt compounding
Layered double hydroxides (LDHs) is a family of inorganic fillers with layered structure. In the paper, poly (ethylene co methacrylic acid) (EMAA) MgAl layered double hydroxide (LDH) nanocomposites were prepared via melt compounding us...
http://www.polymer.cn/research/dis_info8533 |
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高分子量poly(lactic-co-glycolic acid)(PLGA)的合成
关键字：高分子量 PLGA 合成 表征
以丙交酯和乙交酯为单体，采用开环聚合法合成了高分子量的PLGA。借助红外光谱、核磁共振、X-射线衍射和扫描电镜对产品进行了表征。PLGA的分子量采用粘度法进行测定，并测定了其力学强度。结果表明，得到的丙交酯和乙交酯具有很高的纯度。制备的PLGA是典型的半结晶共聚物，其结晶度为18.72%。PLGA的分子量和力学强度均随着GA 含量的增加而逐渐降低。此外，PLGA的断口形貌结果表明，GA的含量越高，PLGA断裂表面上的微裂纹和孔隙...
http://www.polymer.cn/research/dis_info8196 |
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Synthesis of Functional Polymers by Pre-radiation Induced Grafting of Glycidyl Methacrylate onto FEP film
关键字：Pre-radiation grafting copolymerization，Poly (tetrafluoroethylene-co-hexafluoropropylene)，Glycidyl methacrylate，Functional material
FEP-g-GMA graft copolymers were prepared by pre-radiation induced graft copolymerization of glycidyl methacrylate onto poly(tetrafluoroethylene-co-hexafluoropropylene) (FEP). The effects of grafting conditions such as monomer concentration, pre-irradiation dose, gr...
http://www.polymer.cn/research/dis_info7425 |
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Synthesis，characterization and the biodegradation of the comb-type poly(4-hydroxyl-ε-caprolactone-co-ε- caprolactone)-graft-poly(L-lactide)
关键字：Synthesis,characterization,biodegradation,comb,type,poly,hydroxyl,caprolactone,caprolactone,graft,poly,lactide,
To combine good permeability of PCL and good degradability of PLLA, and copolymerization and blending of PCL and PLA have been widely applied. It is difficult to synthesize the fully biodegradable graft aliphatic polyesters becaus...
http://www.polymer.cn/research/dis_info7239 |
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Co 纳米锥阵列的磁性研究
关键字：纳米球刻蚀,纳米锥,纳米点
利用聚苯乙烯微球自组装法得到了单层二维晶体掩模板，利用离子束溅射沉积法在掩模板上沉积高纯Co 薄膜，去除聚苯乙烯微球后得到Co 纳米锥阵列。利用扫描电镜观察样品表面形貌，并利用振动样品磁强计测量其磁学特性。磁性研究表明，纳米锥颗粒为单畴颗粒，其矫顽力较薄膜样品有较大增加，剩磁比也有所改善。
http://www.polymer.cn/research/dis_info7016 |
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Co 链状结构的制备及其表征
关键字：溶剂热法,钴,链状,静磁性能,机理
以氯化钴，水合肼为起始原料，乙二醇为溶剂，采用溶剂热法制得链状结构的金属钴亚微米粒子。通过X 射线衍射分析标定了获得样品的物相为六角堆积(hcp)结构，用透射及扫描电镜观察了样品的形貌，颗粒具有链状结构，长达数微米，构成长链结构的亚微米粒子为球形，粒径约为800nm 左右。用振动样品磁强计表征了样品的静磁性能，测得的饱和磁化强度为163.76emu/g，矫顽力为104.20×79.6A/m。同时简要探论了链状结构的钴亚...
http://www.polymer.cn/research/dis_info7015 |
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Grafing Copolymerization onto Poly(hydroxybutyrate-co-hydroxyvalerate)(PHBHV): Effect on Bacterial Adhesion and Biofilm Formation
关键字：Grafing,Copolymerization,onto,Poly,hydroxybutyrate,hydroxyvalerate,PHBHV,Effect,Bacterial,Adhesion,Biofilm,Formation,
Bacteria tend to associate on surfaces to form a structured community known as biofilms.Due to their resistance to biocides biofilms have many harmful consequences on public health [1,2], biofouling [3], food-processing industries [4]….&nb...
http://www.polymer.cn/research/dis_info5847 |
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