信息类型: 现货/标准品 询价时间: 2025-02-18 11:43 报价截止时间: 2025-02-21 23:59 询价物料信息 行号物料编码物料名称品牌型号采购量 1 -- 凝胶型强酸碱性阴离子交换树脂 -- -- 吨 2 -- 凝胶型强酸碱性阳离子交换树脂 -- -- 吨 招标单位:宁夏大地循环发展股份有限公司 收货地址:宁夏石嘴山...
聚乙烯醇(PVA)水凝胶是一种高分子化合物制成的水凝胶,具有可溶性和良好的生物相容性,可以广泛应用于医学、环保、农业和生物工程等领域。本文将介绍PVA水凝胶的制备方法。 一、材料准备 1. PVA粉末:选择适合需要的聚乙烯醇粉末,粉末的分子量与最终制备出的水凝胶的性质密切相关。 2. 离子交换水:烧杯中添加适量的...
回答者:网友 pva是聚乙烯醇材料,有毒,目前已经被世界卫生组织国际癌症研究机构评定360问答为3类致癌物清单中。 聚乙烯醇:有机化合物,白色片状、絮状或粉末状固体,无味。溶于水(95℃以上),微溶于二括酒微设水备盟甲基亚砜,不溶于汽油、煤油、植物油、苯、甲苯、二氯乙烷、四氯化碳、丙酮、醋酸乙酯、甲醇、乙二...
Composite films of polyvinylalcohol (PVA)-polyvinylpyrrolidone (PVP) and different concentrations of Cobalt Chloride (CoCl 2) were prepared by solution casting technique. The samples prepared were semi-crystalline in nature, with an average crystallite size of a few nanometers. The UV-Visible spectr...
In addition, the presence of 5-ALA implied a change of 34% to System E. Thus, Systems A and D containing 5-ALA presented similar hydrophilicity, and System C presented a reduced contact angle of approximately 36% in relation to water. For diiodomethane, only System E containing 5-ALA ...
2015, 453, 107–114. [CrossRef] [PubMed] 36. Chong, C.; Jie, D.; Bei, L.; Ai, H.; Xiang, Z.; Lang, M.; Shuang, L.; Zhao, C. Toward 3D graphene oxide gels based adsorbents for high-efficient water treatment via the promotion of biopolymers. J. Hazard. Mater. 2013, 263...
同时,凡拟迁入的机动车辆,应当按照《关于加强二手车迁入管理工作的通知》要求,在机动车环保定期检验和安全检验有效期内,采用广西推行的环保检验方法和标准(现阶段为稳态工况法和加载减速法)重新上线检验,检验数据上传市环境保护部门。 记者昨日采访获悉,市商务局、市公安局、市环境保护局近日印发《南宁市关于加强二手车...
The gloss and transparency of the films are relevant properties of coatings, since they have a direct impact on the appearance of the coated product [34]. Figure 2 shows the internal transmittance spectra in the visible light range (400–700 nm) of the films where the highest transparency ...
EJqHZHEiCKoAD6SAt+WkLIp6D8aQI//8C0gwox7LiP34qFaZDJXu+eAOGPQqSD9PqhTtOj qb0eFE5MMb2NgPwUeTVTGireVCei58G2y+OHzyFTC9YcIk4fDmJnCf0xFE0ai5EeaOuG+5THMdy0 19PGKqAQT+koRFJVhJp7WGBu8L4GQDZpRbpX7dJdmj2qbaZqNdFDgIv9xtSQLIcwllPbTQMQwo+C JEzPV8Rvd8w1m1jR0e8jZNdc6yuO2BkdXQmu9F+dmf...