淀粉是目前使用比較廣泛的一類(lèi)可生物降解的多糖類(lèi)天然高分子，具有材料來(lái)源廣、低廉和易生物降解等優(yōu)點(diǎn)，在生物降解材料領(lǐng)域占有重要的地位。但缺點(diǎn)就是是含淀粉的降解塑料耐水性都不好，濕強(qiáng)度差，一遇水其性能則會(huì)減低。那不同水分含量對(duì)玉米淀粉顆粒的結(jié)晶度是怎樣的？

Starch is a kind of biodegradable polysaccharide natural polymer widely used at present, which has the advantages of wide source, low price and easy biodegradation. It plays an important role in the field of biodegradable materials. However, the disadvantage is that the degradable plastic containing starch has poor water resistance, poor wet strength, and its performance will be reduced in case of water. What is the crystallinity of corn starch granules with different water content?

應(yīng)用X-射線衍射方法對(duì)不同水分含量的玉米淀粉顆粒的結(jié)晶度進(jìn)行了研究。只有在玻璃態(tài)情況下,淀粉的無(wú)定型區(qū)域才產(chǎn)生X-射線衍射圖樣,衍射峰的強(qiáng)度、面積在某種程度上依賴(lài)于淀粉的含水量。

The crystallinity of corn starch granules with different moisture content was studied by X - ray diffraction. Only in the case of glass state, the amorphous area of starch can produce X-ray diffraction patterns, and the intensity and area of the diffraction peak depend to some extent on the water content of starch.

玉米淀粉顆粒的X-射線衍射圖形是由兩部分組成的:微晶區(qū)域和無(wú)定型區(qū)域。隨著水分含量的增加,樣品的結(jié)晶度從小到大,并達(dá)到一個(gè)平衡值(約45%)。

The X-ray diffraction pattern of corn starch granules is composed of two parts: microcrystalline area and amorphous area. With the increase of water content, the crystallinity of the sample increases from small to large, and reaches an equilibrium value (about 45%).

室溫下,當(dāng)水分含量處于低水平時(shí)(小于11.25%),玉米淀粉顆粒中的無(wú)定型區(qū)域處于玻璃態(tài),衍射圖形顯示的是微晶區(qū)域和無(wú)定型區(qū)域兩部分的衍射圖形的綜合。

At room temperature, when the water content is low (less than 11.25%), the amorphous region in the corn starch granules is in the glass state, and the diffraction pattern shows the synthesis of the diffraction patterns of the microcrystalline region and the amorphous region.

當(dāng)水分含量處于較高水平時(shí)(大于18.55%),淀粉顆粒中的無(wú)定型區(qū)域處于橡膠態(tài),其X-射線衍射圖形僅由微晶區(qū)域形成。在較低水分含量時(shí)，由于塑化做作用下增大含水量會(huì)導(dǎo)致更多微晶的形成。

When the water content is at a high level (more than 18.55%), the amorphous region in the starch granules is in the rubber state, and its X-ray diffraction pattern is formed only by the microcrystalline region. When the water content is low, increasing the water content due to plasticization will lead to the formation of more microcrystals.

關(guān)于不同水分含量的玉米淀粉顆粒的結(jié)晶度這個(gè)問(wèn)題的了解就到這里了，您對(duì)此有什么問(wèn)題要咨詢(xún)的話歡迎來(lái)我們網(wǎng)站http://m.88dyk.com進(jìn)行了解！

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