Journal of Cellular Plastics最新文献_第8页

Patents March 2021 2021年3月

IF 2.5 4区工程技术

Journal of Cellular Plastics Pub Date : 2021-03-01 DOI: 10.1177/0021955X21990455

引用次数: 0

Melamine-formaldehyde rigid foams – Manufacturing and their thermal insulation properties 三聚氰胺甲醛硬质泡沫。制造及其隔热性能

IF 2.5 4区工程技术

Journal of Cellular Plastics Pub Date : 2021-02-27 DOI: 10.1177/0021955X21997348

M. Kavšek, N. Figar, I. Mihelič, M. Krajnc

{"title":"Melamine-formaldehyde rigid foams – Manufacturing and their thermal insulation properties","authors":"M. Kavšek, N. Figar, I. Mihelič, M. Krajnc","doi":"10.1177/0021955X21997348","DOIUrl":"https://doi.org/10.1177/0021955X21997348","url":null,"abstract":"The manufacturing of novel melamine-formaldehyde rigid foam material, by blowing the melamine-formaldehyde (MF) resin emulsion with pentane and further catalytic and thermal curing, is presented in this work. The process of foaming is described in terms of particular process parameters, which are; the proportions of blowing, curing, emulsifying agents. The examination of the foam, by SEM images, shows that the foam pore sizes are in the range from 150 to 250 µm. The thermal characterization of the obtained foams, is described in terms of thermal conductivity contributions of solid, gas and radiation conduction to total thermal conductivity at atmospheric and vacuum condition. The foam with densities from 50 to 80 kg/m3 achieve thermal conductivity at an atmospheric pressure of 33–34 mW/(m × K), while in a vacuum of 6–7 mW/(m × K). Compared to other organic polymer foams, MF foams have superior fire resistance and chemical stability. The innovation of MF rigid foams presented here, compared to other well-known MF flexible foam, is in their rigid structure, combined with low density and thermal conductivity, which makes this particular foam potentially useful in the manufacture of vacuum insulation panels (VIP).","PeriodicalId":15236,"journal":{"name":"Journal of Cellular Plastics","volume":"84 1","pages":"175 - 193"},"PeriodicalIF":2.5,"publicationDate":"2021-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82167375","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Exfoliated two-dimensional molybdenum disulfide reinforced epoxy syntactic foams 剥落二维二硫化钼增强环氧复合泡沫

IF 2.5 4区工程技术

Journal of Cellular Plastics Pub Date : 2021-01-28 DOI: 10.1177/0021955X20987155

A. Ullas, D. Kumar, P. Roy

{"title":"Exfoliated two-dimensional molybdenum disulfide reinforced epoxy syntactic foams","authors":"A. Ullas, D. Kumar, P. Roy","doi":"10.1177/0021955X20987155","DOIUrl":"https://doi.org/10.1177/0021955X20987155","url":null,"abstract":"In this paper, we report the effect of introducing molybdenum disulfide (MoS2) nano-platelets: a two-dimensional metal chalcogenide, on the mechanical properties of hollow glass microballoon (HGM)–epoxy syntactic foams. MoS2 reinforced syntactic foams were prepared by mixing MoS2 nanoplatelets to epoxy containing HGMs; with the amount of MoS2 being varied from 0.01 to 0.04% v/v, while maintaining a constant total filler volume fraction of 40% for all compositions. The mechanical behaviour of reinforced syntactic foam was studied under varied loadings including compressive, tensile and flexural under different strain rate regimes. Introduction of MoS2 led to significant improvements in characteristic mechanical properties, particularly in terms of compressive strength and toughness, which suggest intercalation of MoS2 within the epoxy matrix; however, the presence of relatively larger MoS2 micro particles couldn’t be completely negated. The toughness of the foam, as indicated by the area under the compressive stress-strain curve, was found to increase by ∼21% under optimal conditions. Our results highlight the potential of the two-dimensional MoS2 sheets as a reinforcing agent in syntactic foams.","PeriodicalId":15236,"journal":{"name":"Journal of Cellular Plastics","volume":"38 1","pages":"159 - 174"},"PeriodicalIF":2.5,"publicationDate":"2021-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80167959","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Eco-friendly composites of polyurethane and sheath palm residues 环保聚氨酯复合材料和鞘棕榈残留物

IF 2.5 4区工程技术

Journal of Cellular Plastics Pub Date : 2021-01-19 DOI: 10.1177/0021955X20987150

Noelle C. Zanini, A. G. de Souza, R. F. Barbosa, D. Rosa, D. Mulinari

引用次数: 7

The effect of organofluorine additives on the morphology, thermal conductivity and mechanical properties of rigid polyurethane and polyisocyanurate foams 有机氟添加剂对硬质聚氨酯和聚异氰脲酸酯泡沫的形态、导热性和力学性能的影响

IF 2.5 4区工程技术

Journal of Cellular Plastics Pub Date : 2021-01-17 DOI: 10.1177/0021955X20987152

C. Brondi, E. Maio, L. Bertucelli, V. Parenti, T. Mosciatti

引用次数: 9

In situ synthesis of CO2 adducts of modified polyethylenimines in polyether polyols for polyurethane foaming 聚氨酯发泡用聚醚多元醇中改性聚亚胺CO2加合物的原位合成

IF 2.5 4区工程技术

Journal of Cellular Plastics Pub Date : 2021-01-11 DOI: 10.1177/0021955X20987153

Shuaiwei Yuan, Yuanzhu Long, Xingyi Xie

{"title":"In situ synthesis of CO2 adducts of modified polyethylenimines in polyether polyols for polyurethane foaming","authors":"Shuaiwei Yuan, Yuanzhu Long, Xingyi Xie","doi":"10.1177/0021955X20987153","DOIUrl":"https://doi.org/10.1177/0021955X20987153","url":null,"abstract":"CO2 adducts from hydrophobically-modified polyethylenimines (PEIs) in powder form are newly-developed environment-friendly blowing agents for polyurethanes (PUs). However, they are difficult to disperse into foaming systems that usually contain polyether polyols as the PU soft segments. Herein, we employ mixtures of di(propylene glycol) monomethyl ether-grafted polyethylenimines (DPG-PEIs) and poly(propylene glycol) (PPG) polyols to absorb CO2, with in situ formation of the CO2 adduct particles as PU blowing agents. Their CO2 saturation degrees, revealed by thermogravimetry, scatter in the range of 93–98%. The DPG side chains tend to be exposed at the particle–matrix interface to stabilize the particles. In addition, some PPG oligomers in the matrix might entangle with the CO2 adduct macromolecules during the in situ particle formation. The entangled PPG chains could further stabilize the suspending particles. The high grafting rate and high molecular weight of the PEI backbones could result in small particles, which largely thicken the foaming systems. The optimized blowing agents, with grafting rates between 5% and 8% and PEI backbone molecular weights not higher than 10k Da, show particle sizes from several hundreds of nanometers to ∼1 μm. The resultant foams demonstrate densities below 50 kg/m3 and compressive strengths over 200 kPa, comparable to the values from industrial foams. This in situ CO2 adduction has potential as a universal method suitable for PU foaming at an industrial scale.","PeriodicalId":15236,"journal":{"name":"Journal of Cellular Plastics","volume":"59 1","pages":"103 - 120"},"PeriodicalIF":2.5,"publicationDate":"2021-01-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81386007","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Patents January 2021 2021年1月

IF 2.5 4区工程技术

Journal of Cellular Plastics Pub Date : 2020-12-23 DOI: 10.1177/0021955X20978318

引用次数: 0

Polyolefinic nanocomposite foams: Review of microstructure-property relationships, applications, and processing considerations 聚烯烃纳米复合泡沫:微观结构-性能关系、应用和加工考虑的综述

IF 2.5 4区工程技术

Journal of Cellular Plastics Pub Date : 2020-12-15 DOI: 10.1177/0021955X20979752

Anish Kumar, B. Patham, S. Mohanty, S. Nayak

{"title":"Polyolefinic nanocomposite foams: Review of microstructure-property relationships, applications, and processing considerations","authors":"Anish Kumar, B. Patham, S. Mohanty, S. Nayak","doi":"10.1177/0021955X20979752","DOIUrl":"https://doi.org/10.1177/0021955X20979752","url":null,"abstract":"In this review, we survey the state of the art on polymeric foams incorporating nano-scale fillers. Particular focus of the review is on foams from polyolefinic nanocomposite formulations incorporating a wide variety of fillers. The nano-scale additives can influence the foam structure and properties in two ways: Firstly, they can act as composite reinforcement to enhance the mechanical properties and functionality of the matrix polymer; and secondly, they can act as foaming-processing aids through modification of the rheological, thermal and crystallization properties of the matrix as well as serving as heterogeneous nucleation sites. Through a combination of these influences, and using advanced processing techniques it is possible to achieve nanocomposite foams that have higher cell density, and more uniform cell size or controlled cell-size distribution. Such controlled foam morphologies, in turn, can yield better specific mechanical properties resulting in more effective light-weighting solutions. Further, the nano-scale additives can impart additional desired functionality resulting in multi-functional foams. In this article, we provide an overview of the mechanical, thermal and a few other relevant functional properties – such as piezoelectric sensitivity, acoustics, and filtration efficiency – of foams prepared using nanocomposite formulations, along with the processing considerations for achieving high quality foams using such materials.","PeriodicalId":15236,"journal":{"name":"Journal of Cellular Plastics","volume":"43 1","pages":"121 - 137"},"PeriodicalIF":2.5,"publicationDate":"2020-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90496644","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 9

Overview and comparison of modelling methods for foams 泡沫材料建模方法综述与比较

IF 2.5 4区工程技术

Journal of Cellular Plastics Pub Date : 2020-12-15 DOI: 10.1177/0021955X20966329

Anna Hössinger-Kalteis, M. Reiter, M. Jerabek, Z. Major

{"title":"Overview and comparison of modelling methods for foams","authors":"Anna Hössinger-Kalteis, M. Reiter, M. Jerabek, Z. Major","doi":"10.1177/0021955X20966329","DOIUrl":"https://doi.org/10.1177/0021955X20966329","url":null,"abstract":"Cellular materials, especially foams, are widely used in several applications because of their special mechanical, electrical and thermal properties. Their properties are determined by three factors: bulk material properties, cell topology and shape as well as relative density. The bulk material properties include the mechanical, thermal and electrical properties of the matrix. The cell topology determines if the foam exhibits stretch or bending dominated behaviour. The relative density corresponds to the foaming degree. It is defined by the cell edge length and cell wall thickness. Especially for the linear elastic properties there are many different modelling approaches. In general, these methods can be divided into two groups namely direct modelling, e.g. analytical and finite element models and constitutive modelling, e.g. models which are generated through homogenization methods. This paper presents an overview of the different modelling methods for foams. Furthermore, sensitivity studies are presented which enable the comparison of the models with regard to the estimation of the elastic properties, show the limits of those models and enable the investigation of the influence of the above mentioned factors on the elastic properties. Selected models are validated with experimental data of a low density foam regarding the Young’s modulus.","PeriodicalId":15236,"journal":{"name":"Journal of Cellular Plastics","volume":"10 1","pages":"951 - 1001"},"PeriodicalIF":2.5,"publicationDate":"2020-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87784561","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 14

Effect of carbon allotropes on foam formation, cure characteristics, mechanical and thermal properties of NRF/carbon composites 碳同素异形体对NRF/碳复合材料泡沫形成、固化特性、力学和热性能的影响

IF 2.5 4区工程技术

Journal of Cellular Plastics Pub Date : 2020-12-15 DOI: 10.1177/0021955X20979548

Pollawat Charoeythornkhajhornchai, Wutthinun Khamloet, Pattharawun Nungjumnong

{"title":"Effect of carbon allotropes on foam formation, cure characteristics, mechanical and thermal properties of NRF/carbon composites","authors":"Pollawat Charoeythornkhajhornchai, Wutthinun Khamloet, Pattharawun Nungjumnong","doi":"10.1177/0021955X20979548","DOIUrl":"https://doi.org/10.1177/0021955X20979548","url":null,"abstract":"Natural rubber composite foam with carbon such as carbon black (CB), carbon synthesized from durian bark (CDB), graphite (GPT), graphene oxide (GO), graphene (GPE) and multi-walled carbon nanotubes (MWCNT) was studied in this work to investigate the relationship between foam formation during decomposition of chemical blowing agent mechanism and crosslink reaction of rubber molecules by sulphur. Natural rubber composite foam with carbon particle was set at 3 parts per hundred of rubber (phr) to observe the effect of carbon allotropes on foam formation with different microstructure and properties of natural rubber composite foam. The balancing of crosslink reaction by sulphur molecules during foam formation by the decomposition of chemical blowing agent affects the different morphology of natural rubber foam/carbon composites leading to the different mechanical and thermal properties. The result showed the fastest cure characteristics of natural rubber foam with 3 phr of graphene (NRF-GPE3) which was completely cure within 6.55 minutes (tc90) measured by moving die rheometer resulting in the smallest bubble diameter among other formulas. Moreover, natural rubber foam with 3 phr of MWCNT (NRF-MWCNT3) had the highest modulus (0.0035 ± 0.0005 N/m2) due to the small bubble size with high bulk density. In addition, natural rubber foam with 3 phr of GPT (NRF-GPT3) had the highest thermal expansion coefficient (282.12 ± 69 ppm/K) due to high amount of gas bubbles inside natural rubber foam matrix and natural rubber foam with 3 phr of GO (NRF-GO3) displayed the lowest thermal conductivity (0.0798 ± 0.0003 W/m.K) which was lower value than natural rubber foam without carbon filler (NRF). This might be caused by the effect of bubble diameter and bulk density as well as the defect on surface of graphene oxide compared to others carbon filler.","PeriodicalId":15236,"journal":{"name":"Journal of Cellular Plastics","volume":"15 1","pages":"41 - 57"},"PeriodicalIF":2.5,"publicationDate":"2020-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83536915","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3