磷酸酯淀粉／PVA共混浆膜的织态结构与性能

研究了淀粉磷酸酯化变性和聚乙烯醇(PVA)结构对磷酸酯淀粉(SPH)/PVA共混浆膜织态结构与力学性能的内在联系,探讨了SPH与PVA间的共混比对浆膜结构和力学性能的影响.实验结果表明,磷酸酯化变性深度、PVA分子结构及共混比对共混浆膜的织态结构及力学性能有显著影响.随着淀粉磷酸酯化变性深度的增大,共混浆膜的断裂伸长率增大,断裂强度先增大后减小;当取代度为0.016时,断裂强度达到最大值.随着SPH质量分数的增加,共混浆膜的断裂伸长率减小,断裂强度先减小后增大;当SPH/PVA的共混比为50/50时,断裂强度达到最小值.提高PVA相对分子质量,增大醇解度,都有利于改善共混浆膜的力学强度,提高耐屈曲性能.     

Investigation on Mechanical Properties of CMSLDS/Acrylate Copolymeric Blending Films for Warp Sizing

Carboxymethyl starch with lower degree of substitution was blended with acrylate copolymer for revealing the relation between mechanical properties and chemical structure of blending film.Effects of carboxymethylation of starch,acrylate constituent units of acrylate copolymers,and copolymer content of the film on the properties were investigated.The mechanical properties were evaluated in terms of tensile strength,breaking elongation,abrasion resistance,and flex-fatigue resistance.Film morphology was examined with X-ray diffraction (XRD),scanning electron microscopy (SEM),and atomic force microscope (AFM).It was found that the properties depended on the degree of substitution of carboxymethyl starch,chemical structure of acrylate units,and content of acrylate copolymer.Phase-separation of the two ingredients occurred within film matrix and the separation was decreased after starch carboxymethylation.Breaking elongation and flex-fatigue resistance of the film reached maximums when acrylate copolymer content was 50%.Excessively increasing the content of acrylate copolymer reduced the film properties.     

平原地貌地区城市工程测量中LIDAR数据应用

机载激光雷达系统（Light Detection And Ranging,简称LIDAR）集成了激光扫描仪、全球定位系统（GPS）、高精度惯导系统（IMU）、数码相机,具有同时采集三维地形数据和数字影像的能力.本文以某市1∶500比例尺地形测量为例,详细介绍了LIDAR的基本原理、地面三维数据的获取和处理方法,以及数据成果的检测.     

二水平正交饱和设计中零效应搜索法的进一步研究

文[4]中提出的零效应搜索法是分析饱和设计的一个新的有效的方法.利用次序统计量期望的另一个性质,用零效应搜索法的思想构造出了相应的检验统计量,对此统计量的性质进行了研究.模拟结果显示,文章的检验统计量也能很好的识别出饱和设计中的显著因子,对误差方差的估计效果也很好.     

Synthesis and Performances of Poly （2-ethylhexyl acrylate-co-acrylic acid） Used for Warp Sizing

A series of poly ( 2 -ethylhexyl acrylate-co-acrylic acid) s ( P (2-EHA-co-AA) ) s with different mole contents of 2-ethylhexyl acrylate ( 2-EHA ) were synthesized through free radical copolymeri...     

分析正交饱和设计的零效应搜索法中s=2的研究

文[4]中方法的一个不足之处是只能适用于s≥3,即至少有2个零效应的2水平饱和设计情形,但对s≤2的情形没有进行研究.本文在文[4]的基础上解决只有一个零效应(即s=2)的情形.模拟结果显示,当只有一个零效应时,零效应搜索法也能很好的识别出饱和设计中的显著因子,且对误差方差的估计也很好.