Article(id=1242135375666290748, tenantId=1146029695717560320, journalId=1146031591421210625, issueId=1242135325993149323, articleNumber=null, orderNo=28, doi=10.3981/j.issn.1000-7857.2016.19.023, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=null, receivedDate=1446912000000, receivedDateStr=2015-11-08, revisedDate=1449936000000, revisedDateStr=2015-12-13, acceptedDate=null, acceptedDateStr=null, onlineDate=1477015914370, onlineDateStr=2016-10-21, pubDate=1476288000000, pubDateStr=2016-10-13, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1477015914370, onlineIssueDateStr=2016-10-21, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1774077751315, creator=sys-migrate, updateTime=1774077751315, updator=sys-migrate, issue=Issue{id=1242135325993149323, tenantId=1146029695717560320, journalId=1146031591421210625, year='2016', volume='34', issue='19', pageStart='1', pageEnd='175', issueExtLink='null', onlineDate='null', pubDate='1476288000000', pubDateStr='2016-10-13', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=3, issueType=-1, specialIssue=null, createTime=1774077739472, creator='sys-migrate', updateTime=1774077739472, updator='sys-migrate', preIssue=null, nextIssue=null, articleTotal=null, ext=null, issueFiles=null, downloadFileDto=null}, startPage=132, endPage=137, ext={EN=ArticleExt(id=1242135382221992075, articleId=1242135375666290748, tenantId=1146029695717560320, journalId=1146031591421210625, language=EN, title=Preparation of poplar powder filled poly lactic acid composites material and application in 3D printing, columnId=1242135221613703813, journalTitle=Science & Technology Review, columnName=Special lssues, runingTitle=null, highlight=null, articleAbstract=Currently, the constraints of the 3D printing technology is in the materials. The paper studies how to add the material by the technology of the fused deposition and the melt mixing process of the polylactic acid and the poplar wood powder composites are experimentally studied, focusing on the mixing ratio of the raw materials, the extrusion conditions and the testing mechanical properties, as well as the microstructure and the performance of the extruded composites. The results show that the amount of poplar wood powders has a significant impact on the composites. With the increasing amount of powders, the mechanical properties of the composites deteriorate. When the added amount of the ordinary poplar powders is 40%, the flexure strength, the tensile strength and the impact strength are decreased by 30.3%, 26.5% and 82.2%. When the added amount of the special poplar powders is 40%, the flexure strength, the tensile strength and the impact strength are decreased by 14.5%, 22.9% and 72.9%. From the rheological properties of the materials, it is seen that the elastic modulus and the loss modulus increase with the increase of the wood powders in a positive correlation. The viscosity of the composites fluid reduces, which suggests that the mobility gets worse and the fluid resistance increases after adding the powders. DSC detection finds that the glass-transition temperature, the crystallization temperature and the melting temperature of composites see no difference as compared to the pure PLA. The addition of wood powders only changes the melt flow but has no effect on the melting point. From the SEM, it is seen that the polylactic acid and the wood powders combine closely and mix uniformly no matter what the proportion of the raw material is. The FT-IR shows that the major groups do not change., authors=XU Min, BI Yongbao, SONG Yongming, authorsList=XU Min, BI Yongbao, SONG Yongming, authorCompany=Key Laboratory of Bio-based Materials Science and Technology of Ministry of Education; Northeast Forestry University, Harbin, 150040, China, correspAuthors=null, authorNote=null, correspAuthorsNote=10.3981/j.issn.1000-7857.2016.19.023, copyrightStatement=null, copyrightOwner=null, extLink=null, articleAbsUrl=null, sourceXml=null, magXml=null, pdfUrl=null, pdf=IzzPMZg51RHAeinPpxh2Cg==, pdfFileSize=4198870, pdfExtLink=null, richHtmlUrl=null, mobilePdfUrl=null, reviewReport=null, pdfFirstPage=null, abstractGraph=null, abstractGraphContent=null, abstractVideo=null, citation=null, cebUrl=null, magXmlContent=null, mapNumber=null, fund=null), CN=ArticleExt(id=1242135379554414725, articleId=1242135375666290748, tenantId=1146029695717560320, journalId=1146031591421210625, language=CN, title=杨木木粉/聚乳酸复合材料的制备及其在3D打印上的应用, columnId=1242116902361830275, journalTitle=科技导报, columnName=专题论文, runingTitle=null, highlight=null, articleAbstract=以熔融沉积增材制造技术为依据，研究了聚乳酸与杨木木粉熔融复合混合工艺，探索了原料混合比例、挤出条件等，并对挤出的复合材料进行了力学性能和微观性能检测。结果表明，杨木木粉添加量对复合材料有显著性影响，随着木粉添加量的增加，复合材料力学性能降低，当普通杨木粉原料添加量为40%时，弯曲强度降低30.3%，拉伸强度降低26.4%，冲击强度降低82.2%；当特殊杨木粉原料添加量为40%时，弯曲强度降低14.5%，拉伸强度降低22.9%，冲击强度降低72.9%；从材料的流变性能可见，添加杨木木粉后，弹性模量和损耗模量均增加，并且与木粉的添加量呈现正相关；复合材料流体的黏度降低，表明添加木粉后，复合材料的流动性变差，流体阻力增大；应用DSC检测复合材料时发现，复合材料基体的玻璃化转变温度、结晶温度和熔融温度与聚乳酸单体相比没有改变，加入木粉后只改变了熔体的流动性，对熔点没有影响；通过SEM观察，无论原料为何种比例，聚乳酸与木粉结合均比较紧密，混合也很均匀；同时傅里叶变换红外光谱显示，各主要基团没有变化。, authors=许民, 毕永豹, 宋永明, authorsList=许民, 毕永豹, 宋永明, authorCompany=东北林业大学, 生物质材料科学与技术教育部重点实验室, 哈尔滨 150040, correspAuthors=null, authorNote=许民,教授,研究方向为生物质基复合材料,电子信箱:dl-xumin@nefu.edu.cn, correspAuthorsNote=李坚(通信作者),中国工程院院士,研究方向为木材科学与仿生,电子信箱:donglinlijian@163.com, copyrightStatement=null, copyrightOwner=null, extLink=null, articleAbsUrl=null, sourceXml=null, magXml=null, pdfUrl=null, pdf=4GKZZ+u9mGSLn3AKBQjx+A==, pdfFileSize=4198870, 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