Impact of processing methods on molecular structure of raw natural rubber: New insights on differences between ribbed smoked sheet and technically specified rubber

IF 5.6 1区农林科学 Q1 AGRICULTURAL ENGINEERING

Industrial Crops and Products Pub Date : 2025-05-14 DOI:10.1016/j.indcrop.2025.121192

Yupan Li , Haozhi Wang , Wenfeng Peng , Hongtu Lin , Xiaoxue Liao , Lusheng Liao

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Abstract

To elucidate the effect of processing methods on the molecular structure of raw natural rubber (NR), this study systematically compared ribbed smoked sheet (RSS) and technically specified rubber (TSR). To eliminate the effects of rubber tree clones and storage hardening, both RSS and TSR were derived from two distinct rubber tree clones: IAN873 (unimodal molecular weight distribution, MWD) and Reyan73397 (bimodal MWD), and also subjected to hydroxylamine neutral sulphate (HNS) treatment to prepare CV rubbers (RSSCV and TSRCV). Results revealed that RSS exhibited significantly higher protein content, molecular weight, Mooney viscosity, initial plasticity, plastic retention index, macrogel content and microgel_<1μm content than TSR, while TSR showed higher total fatty acid contents than RSS. Rheological analyses further indicated that RSS possesses more crosslinking density and entanglement compared to TSR. Therefore, the differences in molecular structure between RSS and TSR were not only evident in structural parameters but also in entanglement. It was critical that HNS treatment did not substantially modify the structural disparities between the two. Strikingly, across different rubber tree clones, RSS and TSR from IAN873 clone outperformed RSS from Reyan73397 clone in non-rubber composition, structural characteristics, and rheological performance. This highlighted that clonal variations not only influenced the structure of NR produced via the same process but also modulated the structure of NR prepared by different processing methods.

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加工方法对天然生橡胶分子结构的影响：关于带肋烟熏板与技术指定橡胶之间差异的新见解

为了阐明加工方式对天然橡胶分子结构的影响，本研究系统地比较了带肋烟熏板橡胶（RSS）和技术指定橡胶（TSR）。为了消除胶树无性系和储存硬化的影响，本研究从IAN873（单峰分子量分布）和热研73397（双峰分子量分布）两个不同的橡胶树无性系中提取RSS和TSR，并对其进行羟胺中性硫酸盐（HNS）处理，制备CV橡胶（RSSCV和TSRCV）。结果表明，RSS的蛋白质含量、分子量、穆尼粘度、初始塑性、塑性保持指数、大凝胶含量和微凝胶1μm含量均显著高于TSR，而TSR的总脂肪酸含量高于RSS。流变学分析进一步表明，相对于TSR， RSS具有更高的交联密度和缠结。因此，RSS和TSR在分子结构上的差异不仅体现在结构参数上，还体现在缠结上。至关重要的是，HNS治疗并没有实质性地改变两者之间的结构差异。值得注意的是，在不同的橡胶树无性系中，IAN873无性系的RSS和TSR在非橡胶成分、结构特征和流变学性能上都优于热研73397无性系的RSS。这表明克隆变异不仅会影响相同工艺制备的NR的结构，还会调节不同工艺制备的NR的结构。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Industrial Crops and Products 农林科学-农业工程

CiteScore

9.50

自引率

8.50%

发文量

1518

审稿时长

43 days

期刊介绍： Industrial Crops and Products is an International Journal publishing academic and industrial research on industrial (defined as non-food/non-feed) crops and products. Papers concern both crop-oriented and bio-based materials from crops-oriented research, and should be of interest to an international audience, hypothesis driven, and where comparisons are made statistics performed.