Synthesis and Characterization of Biodegradable Starch-Polyacrylamide Graft Copolymers Using Starches with Different Microstructures
Synthesis and Characterization of Biodegradable Starch-Polyacrylamide Graft Copolymers Using Starches with Different Microstructures
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不同微结构淀粉可生物降解淀粉-聚丙烯酰胺接枝共聚物的合成与表征
DOI：
10.1007/s10924-012-0473-y
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发表时间：
2013-06
影响因子：
5.3
通讯作者：
Nuozi Zhang
中科院分区：
文献类型：
--
作者：
Dongling Qiao;Ling Chen;Hongsheng Liu;Nuozi Zhang
采用热重分析（TGA）、核磁共振、X射线衍射（XRD）等方法研究了淀粉结构，特别是直链淀粉含量对接枝反应的影响。以不同直链淀粉含量（0、26、50和80%）的玉米淀粉为模型体系，将其接枝到丙烯酰胺上制备高吸水性聚合物（SAP）。采用热重分析法测定了不同温度下的失重率，定量分析了接枝率。一般来说，接枝率随着淀粉直链淀粉含量的增加而增加（约10%），并且对于富含支链淀粉的（蜡质）淀粉，接枝链段长度要低得多。支链淀粉的高分子量和支化结构降低了聚合物链的流动性并增加了粘度，这导致对链生长的抗性。淀粉基SAP的吸水能力随着直链淀粉含量的增加而增加。XRD检测表明，接枝反应后淀粉的结晶结构均被破坏。接枝到淀粉上的聚丙烯酰胺的热稳定性提高了约10 °C，这可以通过接枝聚合物链与淀粉基质之间的强键合来解释。
The effects of starch structures, in particular amylose content, on grafting reactions were investigated using thermal gravimetric analysis (TGA), nuclear magnetic resonance, X-ray diffraction (XRD). As a model system, corn starches with different amylose contents (0, 26, 50 and 80 %) were grafted onto acrylamide to produce superabsorbent polymers (SAPs). The weight loss measured by TGA at different temperature was used to analyze the grafting ratio in quantity. In general, the grafting ratio increased (about 10 %) with increasing starch amylose content, and graft chain segment lengths were much lower for the amylopectin-rich (waxy) starch. The high molecular weight and branched structure of the amylopectin reduced the mobility of the polymer chains and increased viscosity, which resulted in resistance to chain growth. The water absorption capability was increased with increasing amylose content for the starch-based SAPs. XRD detection showed that the crystalline structure of all starches was destroyed after grafting reactions. The thermal stability of the polyacrylamide grafted onto the starches increased by about 10 °C, which could be explained by the strong bonding between the grafted polymer chains and the starch matrices.
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影响因子：
--
作者：
A. Michaels
通讯作者：
A. Michaels
影响因子：
11.4
作者：
Kaith, B. S.;Jindal, R.;Maiti, M.
通讯作者：
Maiti, M.
DOI：
10.1081/mc-100101424
发表时间：
1999-12
期刊：
Journal of Macromolecular Science-reviews in Macromolecular Chemistry and Physics
影响因子：
--
作者：
V. Athawale;S. Rathi
通讯作者：
V. Athawale;S. Rathi
影响因子：
3
作者：
M. M. Shaikh-M.;S. V. Lonikar
通讯作者：
M. M. Shaikh-M.;S. V. Lonikar
DOI：
10.1081/mc-100101420
发表时间：
1999-05
期刊：
Journal of Macromolecular Science-reviews in Macromolecular Chemistry and Physics
影响因子：
--
作者：
I. Arvanitoyannis
通讯作者：
I. Arvanitoyannis