Kaith B S, Kumar Vaneet, Jindal R
Department of Chemistry, Dr. B.R. Ambedkar National Institute of Technology, Jalandhar, Punjab, India.
Biotechnol Rep (Amst). 2015 Dec 19;9:74-81. doi: 10.1016/j.btre.2015.12.004. eCollection 2016 Mar.
A novel interpenetrating polymer network (IPN) has been synthesized through enzymatic initiation using lipase as initiator, glutaraldehyde as cross-linker, acrylic acid as primary monomer and acrylamide as secondary monomer. Biodegradability of synthesized interpenetrating polymer network was studied through soil burial and composting methods. Synthesized hydrogel was completely degraded within 70 days using composting method, while it was 86.03% degraded within 77 days using soil burial method. This was confirmed by Fourier transform Infrared spectroscopy (FTIR) and Scanning electron microscopy (SEM) techniques. Synthesized interpenetrating polymer network hydrogel was used as a device for controlled release of urea and also act as water releasing device. Their impact on soil fertility and plant growth was also studied. The initial diffusion coefficient has a greater value than the later diffusion coefficient indicating a higher fertilizer release rate during the early stage. Fertilizer release kinetic was also studied which showed Non-Fickian diffusion behavior, as the rate of fertilizer release was comparable to the relaxation time of the synthesized matrix. Synthesized IPN enhance the water uptake capacity up to 6.2% and 7.2% in sandy loam and clay soil, respectively.
通过酶引发合成了一种新型互穿聚合物网络（IPN），使用脂肪酶作为引发剂，戊二醛作为交联剂，丙烯酸作为主要单体，丙烯酰胺作为第二单体。通过土壤掩埋和堆肥方法研究了合成的互穿聚合物网络的生物降解性。使用堆肥方法，合成的水凝胶在70天内完全降解，而使用土壤掩埋方法，在77天内降解了86.03%。这通过傅里叶变换红外光谱（FTIR）和扫描电子显微镜（SEM）技术得到证实。合成的互穿聚合物网络水凝胶用作尿素控释装置，也用作水分释放装置。还研究了它们对土壤肥力和植物生长的影响。初始扩散系数的值大于后期扩散系数，表明早期肥料释放速率较高。还研究了肥料释放动力学，结果表明其具有非菲克扩散行为，因为肥料释放速率与合成基质的松弛时间相当。合成的IPN分别使砂壤土和粘土中的吸水能力提高了6.2%和7.2%。
