Preparation and characterization of Santa Barbara Amorphous-15 particles functionalized with mercaptopropyl groups and of their composites with poly(lactic acid)

IF 4.8 3区材料科学 Q1 CHEMISTRY, APPLIED

Microporous and Mesoporous Materials Pub Date : 2024-10-23 DOI:10.1016/j.micromeso.2024.113391

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Abstract

Santa Barbara Amorphous-15 (SBA-15) particles functionalized with mercaptopropyl groups (named as SBASH) have been prepared by a synthetic one-pot approach, and then have been incorporated into poly(lactic acid) (PLA), comparing their characteristics with those shown by composites attained with neat SBA-15 (PLASBA). The silica including the mercaptopropyl groups exhibits a certain loss of regularity because of its functionalization, although displays a better interaction with PLA than the pristine SBA-15 particles in the resulting materials. These composites (PLASBASH and PLASBA) also show a thermal stability slightly higher than neat PLA. An important nucleation effect of SBASH silica in the crystallization of PLA has been deduced from cooling experiments as well as from the cold crystallization in heating runs and from the degree of crystallinity reached. Small Angle X-ray Scattering (SAXS) profiles show that the PLA long spacings are rather similar for the different composites and the neat PLA. Thus, crystal size is rather similar in all samples. Microhardness values show an evident effect of reinforcement in all the composites compared with that shown by neat PLA. Nevertheless, the increase in rigidity is smaller in the biobased PLASBASH composites, those containing the modified silica, than in the PLASBA materials with the pristine SBA-15 particles.

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巯基丙基官能化的圣巴巴拉无定形-15 粒子及其与聚（乳酸）复合材料的制备和表征

通过单锅合成法制备了具有巯丙基功能的圣巴巴拉无定形-15（SBA-15）颗粒（命名为 SBASH），然后将其加入聚乳酸（PLA）中，并将其特性与纯 SBA-15 复合材料（PLASBA）的特性进行了比较。含有巯基丙基的二氧化硅因其功能化而失去了一定的规则性，但与聚乳酸相比，其与原始 SBA-15 颗粒的相互作用效果更好。这些复合材料（PLASBASH 和 PLASBA）的热稳定性也略高于纯聚乳酸。根据冷却实验、加热过程中的冷结晶以及所达到的结晶度，可以推断出 SBASH 二氧化硅在聚乳酸结晶过程中具有重要的成核作用。小角 X 射线散射（SAXS）曲线显示，不同复合材料和纯聚乳酸的聚乳酸长间距非常相似。因此，所有样品的晶体尺寸都非常相似。显微硬度值显示，与纯聚乳酸相比，所有复合材料的增强效果都很明显。不过，与含有原始 SBA-15 颗粒的 PLASBA 材料相比，含有改性二氧化硅的生物基 PLASBASH 复合材料的刚性增加较小。

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来源期刊

Microporous and Mesoporous Materials 化学-材料科学：综合

CiteScore

10.70

自引率

5.80%

发文量

649

审稿时长

26 days

期刊介绍： Microporous and Mesoporous Materials covers novel and significant aspects of porous solids classified as either microporous (pore size up to 2 nm) or mesoporous (pore size 2 to 50 nm). The porosity should have a specific impact on the material properties or application. Typical examples are zeolites and zeolite-like materials, pillared materials, clathrasils and clathrates, carbon molecular sieves, ordered mesoporous materials, organic/inorganic porous hybrid materials, or porous metal oxides. Both natural and synthetic porous materials are within the scope of the journal. Topics which are particularly of interest include: All aspects of natural microporous and mesoporous solids The synthesis of crystalline or amorphous porous materials The physico-chemical characterization of microporous and mesoporous solids, especially spectroscopic and microscopic The modification of microporous and mesoporous solids, for example by ion exchange or solid-state reactions All topics related to diffusion of mobile species in the pores of microporous and mesoporous materials Adsorption (and other separation techniques) using microporous or mesoporous adsorbents Catalysis by microporous and mesoporous materials Host/guest interactions Theoretical chemistry and modelling of host/guest interactions All topics related to the application of microporous and mesoporous materials in industrial catalysis, separation technology, environmental protection, electrochemistry, membranes, sensors, optical devices, etc.