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Preparation and Characterization of Low-Molecular-Weight Natural Rubber Latex via Photodegradation Catalyzed by Nano TiO2

机译：纳米TiO2催化光降解制备低分子量天然胶乳

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摘要

Natural rubber is one of the most important renewable biopolymers used in many applications due to its special properties that cannot be easily mimicked by synthetic polymers. To sustain the existence of natural rubber in industries, modifications have been made to its chemical structure from time to time in order to obtain new properties and to enable it to be employed in new applications. The chemical structure of natural rubber can be modified by exposure to ultraviolet light to reduce its molecular weight. Under controlled conditions, the natural rubber chains will be broken by photodegradation to yield low-molecular-weight natural rubber. The aim of this work was to obtain what is known as liquid natural rubber via photodegradation, with titanium dioxide nanocrystals as the catalyst. Titanium dioxide, which was firstly synthesized using the sol–gel method, was confirmed to be in the form of an anatase, with a size of about 10 nm. In this work, the photodegradation was carried out in latex state and yielded low-molecular-weight natural rubber latex of less than 10,000 g/mol. The presence of hydroxyl and carbonyl groups on the liquid natural rubber (LNR) chains was observed, resulting from the breaking of the chains. Scanning electron microscopy of the NR latex particles showed that titanium dioxide nanocrystals were embedded on the latex surface, but then detached during the degradation reaction.
机译：天然橡胶是许多应用中使用的最重要的可再生生物聚合物，因为其特殊的性能无法轻易地被合成聚合物模仿。为了维持天然橡胶在工业中的存在，不时对其化学结构进行了修改，以获得新的性能并使其能够在新的应用中使用。天然橡胶的化学结构可以通过暴露在紫外线下进行改性以降低其分子量。在受控条件下，天然橡胶链将通过光降解而断裂，从而生成低分子量天然橡胶。这项工作的目的是通过光降解以二氧化钛纳米晶体为催化剂，获得所谓的液态天然橡胶。最初使用溶胶-凝胶法合成的二氧化钛被确认为锐钛矿形式，大小约为10 nm。在该工作中，在胶乳状态下进行光降解，得到的低分子量天然橡胶胶乳小于10,000 g / mol。观察到液态天然橡胶（LNR）链上存在羟基和羰基，这是由于链断裂所致。 NR胶乳颗粒的扫描电子显微镜显示，二氧化钛纳米晶体嵌入在胶乳表面，但随后在降解反应中分离。

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