Wetchakama Phakphimon, Boopasiri Supparoek, Sae-Oui Pongdhorn, Poosimma Poonsuk, Siriwong Chomsri
Materials Chemistry Research Center, Department of Chemistry and Center of excellence for innovation in Chemistry, Faculty of Science, Khon Kaen University, Khon Kaen 40002, Thailand.
National Science and Technology Development Agency (NSTDA), MTEC, 114 Thailand Science Park, Pathum Thani 12120 Thailand.
ACS Omega. 2025 Feb 6;10(6):5953-5962. doi: 10.1021/acsomega.4c09909. eCollection 2025 Feb 18.
This study aimed to synthesize a new grade of ZnO composite by depositing nanosized ZnO on microcrystalline cellulose (MCC), named MCC-ZnO, and compared its performance as a cure activator with an existing commercial ZnO composite using inorganic nanoparticles as a supporting core, named herein as In-ZnO. The results reveal that the synthesized MCC-ZnO consisted of approximately 50% wt. of nanosized ZnO, whereas the commercial one contained approximately 60% wt. When incorporated into styrene-butadiene rubber (SBR), both ZnO composites performed effectively as cure activators, resulting in decreases in scorch time and cure time in association with an increase in torque difference (state of cure). At a given content, MCC-ZnO showed superior cure activation efficacy to In-ZnO, as evidenced by the higher torque difference, which may be attributed to the smaller particle size of ZnO in MCC-ZnO. Regardless of the ZnO composite type, tensile strength, hardness, and modulus kept increasing as the ZnO composite content increased up to 5 phr. Tear strength also increased and reached its maximum at 3 phr for both ZnO composites. The results clearly reveal the potential of using MCC-ZnO to replace conventional ZnO in the production of more environmentally friendly rubber products.
本研究旨在通过将纳米级氧化锌沉积在微晶纤维素（MCC）上合成一种新型氧化锌复合材料，命名为MCC-ZnO，并将其作为硫化活性剂的性能与现有的以无机纳米颗粒为支撑核心的商用氧化锌复合材料（本文命名为In-ZnO）进行比较。结果表明，合成的MCC-ZnO约由50%重量的纳米级氧化锌组成，而商用的则含有约60%重量的氧化锌。当将两种氧化锌复合材料加入丁苯橡胶（SBR）中时，它们均能有效地作为硫化活性剂，导致焦烧时间和硫化时间缩短，同时扭矩差（硫化状态）增加。在给定含量下，MCC-ZnO表现出比In-ZnO更优异的硫化活化效果，这体现在更高的扭矩差上，这可能归因于MCC-ZnO中氧化锌的粒径更小。无论氧化锌复合材料类型如何，随着氧化锌复合材料含量增加至5份，拉伸强度、硬度和模量均持续增加。两种氧化锌复合材料的撕裂强度也均增加，并在3份时达到最大值。结果清楚地揭示了在生产更环保橡胶产品中使用MCC-ZnO替代传统氧化锌的潜力。
