利用硅烷偶联剂KH550对白炭黑纳米粉体进行表面接枝改性,并制备改性白炭黑(m Si O_(2))/环氧树脂(EP)浇铸体,利用傅里叶变换红外光谱(FTIR)、X射线衍射(XRD)、粒度分析、拉伸性能测试、热重分析(TG)、扫描电镜(SEM)等手段对改性前后的...
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利用硅烷偶联剂KH550对白炭黑纳米粉体进行表面接枝改性,并制备改性白炭黑(m Si O_(2))/环氧树脂(EP)浇铸体,利用傅里叶变换红外光谱(FTIR)、X射线衍射(XRD)、粒度分析、拉伸性能测试、热重分析(TG)、扫描电镜(SEM)等手段对改性前后的白炭黑粒、m Si O_(2)/EP浇铸体进行表征分析,探究了KH550对白炭黑的改性效果以及m Si O_(2)用量对浇铸体力学性能、耐热性和结构的影响。结果表明:以异丙醇作为分散剂,当KH550质量分数为20%,反应温度为90℃,反应时间为5h,在醇、水混合溶剂中可以实现KH550对白炭黑的表面改性;当改性白炭黑用量为8%(wt.)时,浇铸体综合性能最好,拉伸强度为41.29MPa,较纯EP提升了95.2%;其最大分解速率时的温度为377℃,较纯EP提升了14℃。
本研究探究干旱胁迫对金莲花(Trollius chinensis Bunge)生长及品质的影响,为选育金莲花种质以及干旱或半干旱地区的栽培提供理论参考。首先,从呼伦贝尔6个产区中筛选出优质种质。然后,对优质种质栽培并进行干旱实验,设置4个干旱梯度:CK (正常水分,土壤含水率15%~20%)、LD (轻度干旱,土壤含水率12%~15%)、MD (中度干旱,土壤含水率5%~10%)、SD (重度干旱,土壤含水率5%以下)。最后,测定金莲花光合作用、形态生长以及药用成分等指标。在LD和MD处理下,金莲花表现出显著的生长优势,株高分别增加了20.47%和8.29%。然而,随着干旱程度的加剧,金莲花的光合作用效率明显下降,同时株高受到显著抑制。此外,在LD处理下,黄酮类药用成分的含量(荭草苷和牡荆素)在金莲花中显著增加。综上所述,轻度干旱条件促进金莲花的生长和药用活性成分的积累。The objective of the study is to investigate the effects of drought stress on the photosynthesis, growth and quality of Trollius chinensis Bunge. Furthermore, it provides theoretical references for the selection and breeding of T. chinensis germplasm and for cultivation in arid and semi-arid regions. First, high-quality germplasm was screened from six production areas in Hulunbuir. Then, the high quality germplasm was cultivated and subjected to drought experiments, and four drought gradients were established: CK (normal moisture, soil water content 15%~20%), LD (light drought, soil water content 12%~15%), MD (moderate drought, soil water content 5%~10%) and SD (severe drought, soil water content below 5%). Finally, indicators of photosynthesis, morphological growth and medicinal constituents of T. chinensis were determined. The results showed that *** exhibited significant growth advantages under LD and MD, and its plant height increased by 20.47% and 8.29% respectively. However, the photosynthetic efficiency of *** decreased significantly with the further intensification of drought, while its plant height was also significantly suppressed. In addition, the flavonoid medicinal components (orientin and ouabain) exhibited a notable increase in concentration in T. chinensis under LD treatment. Light drought conditions are favourable to the morphological growth and the accumulation of medicinally active ingredients of T. chinensis.
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