熔融法制得PP-g-HEMA性能的研究

由熔融法制得聚丙烯接枝甲基丙烯酸β－羟乙酯，用毛细管流变仪、示差扫描量热计、广角Ｘ－射线衍射仪、结晶速率仪、偏光显微镜等对接枝物的流变性能和结晶性能进行了定性、定量表征，比较了接枝前后聚合物结晶形态的变化。     

聚丙烯熔融法接枝HEMA的研究

由熔融法制得聚丙烯接枝甲基丙烯酸β－羟乙酯，用毛细管流变仪、示差扫描量热计、广角Ｘ－射线衍射仪、结晶速率仪、偏光显微镜等对接枝物的流变性能和结晶性能进行了定性、定量表征，比较了接枝前后聚合物结晶形态的变化。     

基于HEA封端聚氨酯大孔树脂颗粒的合成、表征及水声声学性能

制备了丙烯酸-β-羟乙酯(HEA)封端的聚氨酯(PUA)大分子单体,采用正庚烷作致孔剂,用悬浮聚合法合成了聚氨酯-苯乙烯(PUA-St)及聚氨酯-苯乙烯-甲基丙烯酸乙酯-二乙烯基苯（PUA-St-EMA-DVB） AB-交联共聚物大孔树脂颗粒。SEM表明：合成的PUA-St-EMA-DVB颗粒含有规整的、孔径较大的孔洞,而PUA-St共聚物的孔洞则较小且不规整。水声性能测试表明,该柔性大孔树脂的加入能显著改善聚氨酯-环氧树脂(PU-EP)基体的水声吸声性能。当m(Resin)∶m(PU-EP)=20∶100时,添加PUA-St-EMA-DVB颗粒改性的基体比添加PUA-St改性的基体具有更好的水声吸声性能,平均吸声系数由0.25增加到0.81,最大值由0.58增加到0.98。     

^1H—NMR法测定丙烯酸β羟乙酯和丙烯酸正丁酯竞聚率

以丙烯酸β羟乙酯丙烯酸正丁酯共聚体系为研究对象，在共聚单体组成敏感点附近估重复实验，进行了６０℃，８０℃，１００℃，１２０℃，１４０℃下的共聚合，用＾１Ｈ＿ＮＭＲ方法测定共聚物的组成，用Ｍａｙｏ－Ｌｅｗｉｓ微分组成方程的误差变量法计算竞聚率，同时给出竞取率的９５％置信区间。     

水凝胶角膜给药载体治疗大鼠角膜炎的实验观察

目的观察水凝胶角膜给药载体对大鼠角膜炎的治疗效果。方法建立金黄色葡萄球菌角膜炎动物模型,SD大鼠随机分为5组:分子印迹聚甲基丙烯酸-β-羟乙酯与甲基丙烯酸的共聚物P(HEMA-CO-MAA)水凝胶角膜给药载体组、聚甲基丙烯酸-β-羟乙酯与甲基丙烯酸的共聚物P(HEMA-CO-MAA)水凝胶角膜给药载体组、聚甲基丙烯酸-β-羟乙酯(PHEMA)水凝胶角膜给药载体组、加替沙星眼药水组、自愈组,每组各3只,分组进行饲养。比较各组角膜结膜情况并进行角膜细菌划线培养和病理组织学观察。结果角膜炎大鼠干预后48 h进行检测,自愈组划线细菌培养与干预前无明显差别,PHEMA组划线菌落培养少于干预前,而加替沙星眼药水组、P(HEMA-CO-MAA)组及分子印迹P(HEMA-CO-MAA)组划线菌落培养明显少于干预前。角膜冰冻切片行HE染色,各组均可见水肿,相对于眼药水组,P(HEMA-CO-MAA)及分子印迹P(HEMA-CO-MAA)水凝胶角膜给药载体组角膜基质水肿程度较弱,炎症浸润细胞较少。结论 P(HEMA-CO-MAA)和分子印迹P(HEMA-CO-MAA)水凝胶角膜给药载体比PHEMA水凝胶角膜给药载体杀菌效果强,更具有未来长效缓释的研究价值。     

元素分析法测定苯乙烯和丙烯酸—β—羟乙酯竞聚率的误差分析

一对单体，可查到非常多数值不同的竞聚率文献值，说明无论从精度和准确性来说，竞聚率的测定和求算都可能产生很大误差。本文在单体敏感点组成进行实验，用元素分析法测定共聚物组成，用Ｅｒｒｏｒ－ｉｎ－ＶａｒｉａｂｌｅＭｅｔｈｏｄ（ＥＶＭ）［１］法计算苯乙烯（Ｓｔ，Ｍ１）和丙烯酸－β－羟乙酯（ＨＥＡ，Ｍ２）竞聚率，分析全过程的误差来源和大小。     

芳香PET树脂母粒的研制

通过丙烯酸和丙烯酸正丁酯溶液共聚合，得到丙烯酸－丙烯酸正丁酯共聚物，该树脂与环氧氯丙烷反应后再与PET树脂切片继续反应，可使PET树脂切片表面形成聚丙烯酸酯自膨润型吸油网络结构，将表面具有聚丙烯酸酯自身膨润型吸油网络结构的PET树脂切片（简称为留香剂）在油溶性香精中浸泡，香精就被吸附在留香剂表面，即得到芳香PET树脂母粒。用SEM观察了母粒的表面结构形态。     

温度及PH敏感性水凝胶的合成及性能研究

乙烯基吡咯烷酮与丙烯酸共聚物／聚丙烯酸β-羟基丙酯互穿网络水凝胶具有温度及PH双重敏感特性。经验证,在蒸馏水中,聚丙烯酸β－羟基丙酯与丙烯酸间存在络合作用,在缓溶液中,没有这样络合作用。     

聚氨酯凝胶预聚物对传统树脂基质体积收缩的影响及对其综合性能的改善作用

目的:合成一种光反应性聚氨酯(PU)凝胶预聚物IBGBMA,并探讨其对传统树脂基质体积收缩和机械性能的影响.方法:通过溶液法,以异氟尔酮二异氰酸酯、双酚-A和甲基丙烯酸羟乙酯等为原料,以1,4-丁二醇和三羟基甲基丙烷为扩链剂和交联剂合成一种光反应性PU凝胶预聚物IBGBMA,实现其与光固化树脂基质的化学结合,通过傅里叶...     

原子转移自由基聚合法合成含羟基星状共聚物

以２－溴异丁酸季戊四醇四酯为引发剂在ＣｕＢｒ／ｂｐｙ催化下实施苯乙烯和丙烯酸β－羟丙酯原子转移自由基共聚合,结果表明聚合物的分子量与理论分子量接近,聚合反应具有活性聚合的特征。进一步对聚合产物进行ＧＰＣ,Ｈ－ＮＭＲ,ＩＲ和羟值滴定分析,表明合成的星状共聚合物中同时具有苯乙烯和丙烯酸β－羟丙酯结构单元,而且羟基在聚合物中近似均匀分布。     

紫外光固化耐磨涂料的进展

综述了紫外光固化耐磨涂料的进展情况 ,着重介绍了溶胶 -凝胶法制备紫外光固化耐磨杂化涂料的研究进展。     

生物医用镁合金改性方法的比较

镁合金是一种生物相容性良好,潜在市场需求巨大的生物医用材料.但由于其降解速率太快,成为其扩展应用的瓶颈.本文综述了镁合金主要采用的改性技术:纯化镁合金、镁合金的合金化、镁合金的热处理、镁合金的表面处理；其中主要对比了各种镁合金的表面改性方法,分析了各种方法的优缺点,为持续改善镁合金的降解性能提供一定的参考,并对其未来进...     

金红石型钛白粉表面包覆氧化铝的形态及机理

探讨了以H2SO4和CH2OHCH2Cl为酸解介质时,氯化法金红石型钛白粉表面包铝的行为及形态特征。利用正交实验研究了包膜过程中,熟化pH、熟化时间以及温度对包铝钛白粉白度的影响。氯化法金红石型钛白粉浆在pH为10时,Zeta电位最大,在水中达到最佳分散,利用H2OHCH2Cl作为酸解介质时,浆液中的均相成核得到显著抑制,钛白粉表面的包膜质量得到明显改善。以稀硫酸作为酸解介质时,随熟化温度升高和熟化时间的延长,钛白粉包覆效果明显改善,白度值明显升高。     

助流剂的含量对热熔型道路标线涂料性能的影响

目的探讨助流剂对热熔型道路标线涂料加工性能的影响。方法选择不同比例的助流剂加入到标线涂料中，充分混合均匀，加热使其熔融，测其流出时间和流动性，确定符合涂料要求的助流剂的含量。结果控制好助流剂的用量对涂料的加工性能影响较大。结论选择适宜含量的助流剂关乎热熔道路标线涂料的施工方便及其使用寿命。     

AFM研究Sol—Gel法制备的TiO2和Al2O3—TiO2—SiO2涂腊有面形貌

载玻片在金属醇化物的溶胶中浸涂、热处理，获得厚度为５０～９０ｎｍ的ＴｉＯ２和ＸＡｌ２Ｏ３－ＹＴｉＯ２－ＺＳｉＯ２涂膜（Ｘ＝０～３０，Ｙ＝０．２５～０．６０，Ｚ＝０．２０～０．６５，摩尔分数）。使用原子力显微镜（ＡＦＭ）研究涂膜表面纳米范围的形貌。研讨了化学组成，热处理温度与时间，以及热处理前或后的贮存史对表面形貌，ｒｍｓ－均方根粗糙度和锐钛矿结晶的影响。     

Multiple coatings can improve the bond durability of one-step self-etching adhesive to primary dentin

Objective To investigate whether multiple coatings can improve the bond durability of one-step self-etching adhesive to primary dentin.Methods Twelve caries-free human primary molars were randomly divided into 2 groups.In group 1,each tooth was hemisected into 2 halves.One half was assigned to the control subgroup 1,which was bonded with a commercially available one-step self-etching adhesive according to the manufacturer’s instructions;the other half was assigned to experimental subgroup 1,in which the adhesive was applied three times before light curing.In group 2,one split half tooth was bonded with a commercially available one-step self-etching adhesive according to the manufacturer’s instructions;for the other half,three layers of adhesive were applied with each successive layer of light curing.Specimens were stored in 0.9% NaCl containing 0.02% sodium azide at 37℃ for 18 months and then were subjected to microtensile bond strength test and the fracture mode analysis.Results When the adhesive was applied three times before light curing,the bond strength of the experimental subgroup 1 was significantly higher than that of the control subgroup 1(47.46±13.91 vs.38.12±11.21 MPa,P<0.05).When using the technique of applying multiple layers of adhesive with each successive layer of light curing,no difference was observed in bond strength between the control subgroup and the experimental subgroup(39.40±8.87 vs.40.87±9.33 MPa,P>0.05).Conclusion Multiple coatings can improve the bond durability of one-step self-etching adhesive to primary dentin when using the technique of light-curing after applying 3 layers of adhesive.     

Effect of multiple coatings of one-step self-etching adhesive on microtensile bond strength to primary dentin

Objective To investigate the effect of multiple coatings of the one-step self-etching adhesive on immediate microtensile bond strength to primary dentin.Methods Twelve caries-free human primary molars were randomly divided into 2 groups with 6 teeth each.In group 1,each tooth was hemisected into two halves.One half was assigned to control subgroup 1,which was bonded with a single-step self-etching adhesive according to the manufacturer's instructions;the other half was assigned to experimental subgroup 1 in...     

Determination of bisphosphonates anti-resorptive properties based on three forms of ceramic materials: Sorption and release process evaluation

There is a strong need to search for more effective compounds with bone anti-resorptive properties, which will cause fewer complications than commonly used bisphosphonates. To achieve this goal, it is necessary to search for new techniques to characterize the interactions between bone and drug. By studying their interaction with hydroxyapatite (HA), this study used three forms of ceramic materials, two of which are bone-stimulating materials, to assess the suitability of new active substances with anti-resorptive properties. In this study, three methods based on HA in loose form, polycaprolactone/HA (a polymer-ceramic materials containing HA), and polymer-ceramic monolithic in-needle extraction (MINE) device (a polymer inert skeleton), respectively, were used. The affinity of risedronate (a standard compound) and sixteen aminomethylenebisphosphonates (new compounds with potential antiresorptive properties) to HA was defined according to the above-mentioned methods. Ten monolithic materials based on 2-hydroxyethyl methacrylate/ethylene dimethacrylate are prepared and studied, of which one was selected for more-detailed further research. Simulated body fluids containing bisphosphonates were passed through the MINE device. In this way, sorption–desorption of bisphosphonates was evaluated using this MINE device. The paper presents the advantages and disadvantages of each technique and its suitability for assessing new active substances. All three methods allow for the selection of several compounds with potentially higher anti-resorptive properties than risedronate, in hope that it reflects their higher bone affinity and release ability.     

金属载体上原位合成ZSM-5分子筛

以正硅酸乙酯(TEOS)和NaAlO2作为硅源和铝源，四乙基氢氧化铵(TEAOH)作为模板剂，用水热合成法在经表面处理的金属载体上原位合成了ZSM-5分子筛涂层，并采用BET、XRD、SEM等表征技术，研究了金属材料的处理方法、合成时间及次数等因素对ZSM-5分子筛涂层的结晶度、比表面积、覆盖率和涂层热牢固度的影响。结果表明，用原位合成法可以在金属载体上制得结晶度高、热牢固度好的ZSM-5涂层。     

光固化聚氨酯丙烯酸酯涂层的固化动力学及其稳定化研究

研究了脂肪族和芳香族聚氨酯丙烯酸酯类低聚物的光固化动力学和反应型受阻胺 ( r HALS)对光固化聚氨酯丙烯酸酯涂层的光防护效果。加速老化实验结果表明 :r HALS的光稳定体系可有效地将试样的黄度指数 (YI)控制在较低水平内 (辐照时间 10 0 0h ,YI <1%～ 2 % )。含有 r HALS的光固化涂层比相应的商品HALS具有更优越的耐光氧老化性能。