The present study deals with synthesis of cardanol-cased novolac (CBN) resin by the condensation reaction between cardanol and formaldehyde using acoustic cavitation. It is a step-growth polymerization which occurs in the presence of an acid catalyst such as adipic acid, citric acid, oxalic acid, sulphuric acid and hydrochloric acid. CBN was also synthesised by a conventional method for the sake of comparison of techniques. The effect of molar ratio, effect of catalyst, effect of different catalyst and effect of power on the conversion to CBN has been studied. The synthesised CBN was characterized using the Fourier Transform Infra Red Spectroscopy (FTIR), Gel Permeation Chromatography (GPC), Nuclear Magnetic Resonance (NMR) Spectroscopy and Thermogravimetric Analysis (TGA). The reaction was monitored by the Acid value, free formaldehyde content and viscosity of the synthesised product. The reaction time required for the conventionally synthesised CBN was 5 hours (300 minutes) with 120°C as an operating temperature while sonochemically the time reduced to 30 minutes at room temperature. The amount of time and energy saved can be quantified. Ultrasound facilitated synthesis was found to be an energy efficient and time-saving method for the synthesis of novolac resin.

本研究涉及c的合成腰果酚与线型酚醛清漆（CBN）树脂通过声空化作用，通过腰果酚与甲醛之间的缩合反应。它是逐步增长的聚合反应，在酸催化剂如己二酸，柠檬酸，草酸，硫酸和盐酸的存在下发生。为了技术比较，也通过常规方法合成了CBN。研究了摩尔比，催化剂的影响，不同催化剂的影响以及功率对CBN转化的影响。使用傅立叶变换红外光谱（FTIR），凝胶渗透色谱（GPC），核磁共振（NMR）光谱和热重分析（TGA）对合成的CBN进行表征。通过酸值，游离甲醛含量和合成产物的粘度监测反应。以120℃为操作温度，常规合成的CBN所需的反应时间为5小时（300分钟），而在室温下以声化学方法将反应时间减少至30分钟。节省的时间和精力可以量化。发现超声促进的合成是合成酚醛清漆树脂的节能且省时的方法。