Journal of Vinyl and Additive Technology最新文献

{"title":"Methacrylic acid grafted inulin and carboxymethyl cellulose as additives in the development of pH sensitive hydrogel matrix for colon targeting","authors":"Pallobi Dutta, Kaushik Mukherjee, Tapan Kumar Giri","doi":"10.1002/vnl.22133","DOIUrl":"https://doi.org/10.1002/vnl.22133","url":null,"abstract":"<jats:label/>Compression‐coated matrix tablets were developed to target budesonide (BUD) in the colonic region using methacrylic acid (MAA) grafted inulin (INU) and carboxymethyl cellulose (CMC). INU was grafted with MAA to impart anionic characteristics to the gum, making it feasible to form a hydrogel by cross‐linking with calcium gluconate (CG). The core matrix made up of MAA‐g‐INU alone disintegrated within 30 min and the core matrix made up of CMC alone completely released BUD within 6 h. The combination of MAA‐g‐INU and CMC produced a rigid matrix, which was able to completely release BUD after 7 h. Compression coating of the core tablets with MAA‐g‐INU and CMC did not release BUD in the first 4 h, and complete BUD release took place in the next 4 h. Compression coating led to the formation of a rigid and viscous gel layer outside the core matrices, which hindered BUD release. We conclude that compression coating with CG cross‐linked CMC and MAA‐g‐INU could be used as a matrix for colonic delivery of drugs.Highlights<jats:list list-type=\"bullet\"> <jats:list-item>Compression coated matrices were developed for colonic delivery of BUD.</jats:list-item> <jats:list-item>The matrix retained drug release up to 4 h in upper gastrointestinal tract (GIT).</jats:list-item> <jats:list-item>The matrix exhibited complete drug release in the next 4 h in the colon.</jats:list-item> </jats:list>","PeriodicalId":17473,"journal":{"name":"Journal of Vinyl and Additive Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141519804","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effects of nano‐TiO2 in configuration design and sound absorption of polyvinyl alcohol coated composite fabric structure","authors":"Shubing Zhu, Xiaoning Tang","doi":"10.1002/vnl.22134","DOIUrl":"https://doi.org/10.1002/vnl.22134","url":null,"abstract":"<jats:label/>With the rapid development of industrialization and population surge in modern society, noise pollution has been considered as a serious threat to human beings. In order to effectively reduce noise, the application of sound absorbing textile materials has gradually increased, also the rapid development of acoustic coating consists of conventional fiber layers and polymers. In this work, the surface morphology, micro‐structure and sound absorption properties of polyvinyl alcohol coated fabric and its composites were studied. It was found that the addition of nano‐TiO<jats:sub>2</jats:sub> particles can obviously improve the sound absorption properties, and the absorption coefficient is related to fabric thickness. Furthermore, the surface of the coated fabric was compounded with melt‐blown nonwoven fabric, thus to fabricate composite sound absorber. This work indicates the good feasibility and promising application prospect of lightweight polyvinyl alcohol coated fabrics in noise reduction engineering.Highlights<jats:list list-type=\"bullet\"> <jats:list-item>Combination of fiber layers and polymers for acoustic coating materials.</jats:list-item> <jats:list-item>Adding inorganic nano‐TiO<jats:sub>2</jats:sub> particles with different contents.</jats:list-item> <jats:list-item>Different modification methods to improve the dispersion of coating.</jats:list-item> <jats:list-item>Composite structure with reduced thickness and increased sound absorption.</jats:list-item> </jats:list>","PeriodicalId":17473,"journal":{"name":"Journal of Vinyl and Additive Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141502408","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effect of solid lubricant additives on solid particle erosion characteristics of rigid and toughened epoxy resins","authors":"Pelin Özzaim Toker, Orkan Baran Korkusuz, Elanur Ozun, Reyhan Ceylan, Sinan Fidan, Eser Yarar, Mustafa Özgür Bora, Tamer Sınmazçelik","doi":"10.1002/vnl.22132","DOIUrl":"https://doi.org/10.1002/vnl.22132","url":null,"abstract":"<jats:label/>Solid lubricants are added to polymers to upgrade their tribological properties, especially in cases where adhesive and abrasive friction are valid. However, there are not enough studies on the effects of solid lubricants on particle erosion. This study investigated the effects on solid particle erosion behavior of three different well known solid lubricants (molybdenum disulfide, polytetrafluoroethylene, and graphite). These solid lubricants were added at three different ratios (5, 10, and 15 wt.%) to the two different type (rigid and toughened) epoxy resins. Garnet abrasive particles (180–400 μm) were blasted to the sample surface under 1.5 bar for 15 s to conduct solid particle erosion tests. The erosive wear mechanisms of neat and solid lubricant‐reinforced epoxy resins were investigated in relation to the epoxy type, solid lubricant type, and solid lubricant reinforcement ratio. Statistical analysis was performed according to response surface methodology to support the experimental results, and ANOVA tables were obtained. The wear and deformations that occurred on the surface after solid particle erosion were examined using a noncontact optical profilometer system and scanning electron microscopy, and a significant relationship was detected between the deformation on the surface and particle erosion. Analysis results showed that the factor causing the greatest erosion rate change was the epoxy resin type. Finally, it has been observed that all solid lubricants reduce the erosive wear resistance, and this resistance decreases as the weight ratio increases.Highlights<jats:list list-type=\"bullet\"> <jats:list-item>Investigations were conducted into the erosion behavior of two types of epoxy resins: rigid and toughened. The toughened epoxy resin exhibited greater resistance to erosion. Although it has the same type of content, on average, rigid epoxy worn 2–4 times more than toughened epoxy.</jats:list-item> <jats:list-item>The effect of adding polytetrafluoroethylene tended to increase the erosion rate of both rigid and toughened epoxy resin less than that of other solid lubricants.</jats:list-item> <jats:list-item>Graphite particles increased the erosion rate of toughened epoxy by 1.5–3 times and that of rigid epoxy by 2–3 times, depending on the value of the reinforcement ratio.</jats:list-item> <jats:list-item>MoS<jats:sub>2</jats:sub> increased the erosion rate of toughened epoxy by 1.5–3 times and that of rigid epoxy by 2–3 times.</jats:list-item> <jats:list-item>Using a noncontact optical profilometer (for investigating surface topography), it was proven that there is a significant relationship between the erosion rate and roughness characteristics. Wear mechanisms were identified by SEM analysis.</jats:list-item> </jats:list>","PeriodicalId":17473,"journal":{"name":"Journal of Vinyl and Additive Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141502522","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effect and mechanism study of mixed‐dimensional palygorskite clay on thermo‐stability, flame‐retardant and smoke‐suppression for PC/ABS composites","authors":"Zeyang Gao, Yu Zhu, Bihe Yuan, Bin Mu","doi":"10.1002/vnl.22129","DOIUrl":"https://doi.org/10.1002/vnl.22129","url":null,"abstract":"This investigation investigates the effects and mechanisms of mixed‐dimensional palygorskite clay (MDPal) on the thermal stability, flame retardancy and smoke suppression of polycarbonate/acrylonitrile‐butadiene‐styrene (PC/ABS) composites. MDPal, comprising palygorskite and illite as its main mineral components, is characterized by its interwoven morphology and the presence of Fe ions in its octahedral framework, making it highly promising for enhancing the fire safety of flammable composites. The incorporation of MDPal at a 10 wt% dosage leads to significant improvements in the fire safety of PC/ABS composites, including the reduction of 29.8% in peak heat release rate, 9.9% in total heat release, 34.5% in peak smoke production rate and 15.7% in total smoke production compared to pure PC/ABS. Besides, there is a notable increase of 31.5% in tensile strength and 80.4% in elongation at break when the content is 5 wt%. This research offers valuable insights into the application of MDPal for enhancing the thermal stability, flame retardancy and smoke suppression of flammable polymers.\u0000MDPal plays dual functions in gas and condensed phases as a flame retardant.\u0000MDPal effectively reduces the heat and smoke release of PC/ABS composites.\u0000MDPal improves the thermo‐stability and tensile strength of PC/ABS composites.\u0000The flame‐retardant and smoke‐suppression mechanisms of PALC are elucidated.\u0000","PeriodicalId":17473,"journal":{"name":"Journal of Vinyl and Additive Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141342387","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}