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1、第43卷第7期塑料工業(yè)2015年7月CHINAPIASTICSINDUSTRY·19·激光改性對(duì)聚氨酯表面濕潤(rùn)性能影響的實(shí)驗(yàn)研究平玉清,江開(kāi)勇(華僑大學(xué)機(jī)電及自動(dòng)化學(xué)院,福建廈門361021)摘要:采用脈沖激光(A=1064nm,v=3m/s,45kHz)對(duì)聚氨酯(PUR)表面的形貌和濕潤(rùn)性進(jìn)行改性。利用掃描電子顯微鏡(SEM)、三維視頻顯微鏡、激光非接觸式粗糙度測(cè)試儀研究了激光功率對(duì)PUR表面形貌的影響規(guī)律。結(jié)果表明,激光刻蝕后的PUR表面具有孔洞、凸起、溝槽的形貌特征,表面粗糙度增大;功率從1W增大到7w的過(guò)程中,表面粗糙度逐漸增大;功率7~1Ow變化時(shí),表面粗糙度逐漸減小。采用SEM、光
2、電子能譜儀(XPS)、SL200B型接觸角測(cè)定儀探討了激光改性對(duì)PUR表面濕潤(rùn)性的影響機(jī)理。結(jié)果表明,未經(jīng)激光改性的PUR表面,水接觸角為73。,表明此時(shí)PUR表面呈親水性;激光改性后,水接觸有所增大,當(dāng)P=5W時(shí),接觸角為94。,表明PUR表面已由親水性變?yōu)槭杷?,另外發(fā)現(xiàn),隨著激光功率的增加,接觸角逐漸變大,當(dāng)P=7W時(shí),水接觸達(dá)到最大值123。,分析激光改性前后的PUR表面XPS圖譜發(fā)現(xiàn),改性后材料表面的碳氧比例(O/C)有所增加,表明含氧極性官能團(tuán)增加,理論上更利于PUR表面的親水性,但由于表面形貌的變化,材料表面仍呈疏水性,符合Cassie模型。所以,激光改性使得PUR表面濕潤(rùn)性發(fā)生
3、變化主要是由其表面的形貌發(fā)生變化所引起的。關(guān)鍵詞:激光;表面改性;形貌;濕潤(rùn)性DOI:10.3969/j.issn.1005-5770.2015.07.005中圖分類號(hào):TQ323.8文獻(xiàn)標(biāo)識(shí)碼:A文章編號(hào):1005—5770(2015)07—0019—05ExperimentalStudyofInfluenceofLaserModificationonWettingPropertiesofPolyurethaneSurfacePINGYu—qing,JIANGKai—yong(CollegeofMechanicalEngineeringandAutomation,HuaqiaoUnivers
4、ity,Xiamen361021,China)Abstract:Pulsedlaser(A=1064am,=3m/s,,=45kHz)wasusedtomodifythemorphologyandsurfacewettabilityofpolyurethane(PUR).Scanningelectronmicroscopy(SEM),three-dimensionalvideomicroscopyandlasernon—contactroughnesstesterwereusedtoinvestigateeffectsoflaserpoweronthePURsurfacemorphology.
5、Theresultsshowedthat,afterlaseretching,thePURsurfacehadfeaturesofholes,groovesandconvexs,andthesurfaceroughnessincreased;whenthepowervalueincreasedfrom1Wto7W,thesurfaceroughnessgraduallyincreased;whenthepowervaluechangedfrom7Wto10W,thesurfaceroughnessgraduallydecreased.BySEM,photoelectronspectroscop
6、y(XPS)andSL200Btypecontactanglemeasurement,theeffectmechanismoflasermodificationonthewettabilityofPURsurfacewasstudied.TheresultsshowedthatthewatercontactangleofPURsurfacebeforelasermodificationwas73。,showingahydrophilicsurface;afterlasermodification,thewatercontactangleincreased,andthecontactanglew
7、as94。whenP=5W,showingthePURsurfacechangingfromhydrophiliconetohydrophobicone:additionally,withincreasinglaserpower,thewatercontactanglegraduallyincreased,whichreachedthemaximumvalueof123。whenP=7W.Byan