The relationships between the polymerization related to structure and the composition of different types of natural resins were determined. Analyses were carried out by Fourier transform infrared spectroscopy (FTIR), differential thermal analysis–thermogravimetry (DTA-TG) and hot stage microscopy (HSM). Copal specimens were collected from the Mai-Ndombe Lake, Democratic Republic of Congo, and amber pieces that came from Bitterfeld, Germany, and from Kaliningrad, Russia. FTIR spectra of copal show a vibrational band at 1643 cm⁻¹ (C=O stretching) attributed to communic acids, while amber shows a band at 1735 cm⁻¹ associated with ester-group vibrations and a shoulder at about 3340 cm⁻¹, suggesting partial oxidization. DTA shows the main exothermic peak, related to the combustion, at 546–552 °C in amber and at 518 °C in copal. The derivative thermogravimetry (DTG) peaks vary in the different resin types; in amber, they occur at 333–335, 401–404 and 548–555 °C and are related to mass losses of 31, 26 and 39 mass%, respectively; copal peaks are at 394 and 507 °C, with mass losses of 71 and 27 mass%, respectively. In copal, hot stage microscopy (HSM) shows the start of sintering at 131 °C, followed by an expansion produced by the material decomposition and the generation of gases that cannot be released because of the material plastic behaviour. Finally, the increase in pressure produces an explosion that results in a lower viscosity of the liquid, which at this point can no longer support the internal pressure of gases. In amber samples, a smaller decrease in viscosity is observed and the start of sintering occurs at 150 °C with no significant change in their morphology.

确定了与结构相关的聚合与不同类型天然树脂的组成之间的关系。通过傅里叶变换红外光谱（FTIR）、差热分析-热重分析（DTA-TG）和热台显微镜（HSM）进行分析。柯巴脂标本是从刚果民主共和国的迈恩东贝湖采集的，琥珀碎片则来自德国比特费尔德和俄罗斯加里宁格勒。^{柯巴脂的 FTIR 光谱显示 1643 cm -1}处的振动带（C=O 伸缩）归因于通信酸，而琥珀则显示 1735 cm ^-1处的与酯基振动相关的振动带以及约 3340 cm ^{-1处的肩峰}，表明部分氧化。DTA 显示与燃烧相关的主要放热峰，琥珀为 546–552 °C，柯巴脂为 518 °C。不同树脂类型的导数热重分析 (DTG) 峰有所不同；在琥珀中，它们发生在 333–335、401–404 和 548–555 °C，分别与 31、26 和 39 质量％的质量损失有关；柯巴脂峰位于 394 和 507 °C，质量损失分别为 71 和 27 质量%。在柯巴脂中，热台显微镜 (HSM) 显示在 131 °C 时开始烧结，随后材料分解产生膨胀，并产生由于材料塑性行为而无法释放的气体。最后，压力的增加产生爆炸，导致液体粘度降低，此时液体不再能够支撑气体的内部压力。