我想要一套小房子，能做你的小妻子，一起提着菜篮子，穿过门前的小巷子，饭后不用你洗盘子，可你得负责抹桌子，再要个胖胖的小孩子，可爱得就像个小丸子，等你长出了白胡子，坐在家中的老椅子，可会记得这好日子，和我美丽的花裙子。我想要一套小房子，能做你的小妻子，一起提着菜篮子，穿过门前的小巷子，饭后不用你洗盘子，可你得负责抹桌子，再要个胖胖的小孩子，可爱得就像个小丸子，等你长出了白胡子，坐在家中的老椅子，可会记得这好日子，和我美丽的花裙子。

我渴望的幸福，平淡中带着安详，就像冬日的暖阳，从天而降并余味悠长。

七岁的那一年捉住那只蝉，就以为能捉住整个夏天。十七岁的那一年吻过她的脸，就以为和他能永远。

既然选择了远方，留给世界的就只能是背影。

这些年我一直在努力的让自己不后悔

我必须试着变得柔软，而非坚硬；流畅，而非拘谨；温柔，而非冷漠；发现，而非寻找

 

第二篇：摘录不饱和聚酯文献中的经典句子

1.To access the description of a composite material, it will be necessary to specify the nature of components and their properties, the geometry of the reinforcement, its distribution, and the nature of the reinforcement–matrix interface.

2. However, most of them are not chemically compatible with polymers

3. That’s why for many years, studies have been conducted on particles functionalization to modulate the physical and/or chemical properties and to improve the compatibility between the ?ller and the matrix [7].

4. Silica is used in a wide range of products including tires, scratch-resistant coatings, toothpaste,medicine, microelectronics components or in the building

5. Fracture surface of test specimens were observed by scanning electron microscopy

6. Test specimens were prepared by the following method from a mixture composed with 40 wt% UPE, 60 wt% silica Millisil C6 and components of ‘‘Giral.’

7. Grafted or adsorbed component amounts on modi?ed silica samples were assessed by thermogravimetric analysis (TGA) using a TGA METTLER-TOLEDO 851e thermal system. For the analysis, about 10–20 mg of samples were taken and heated at a constant rate of 10 ?C/min under air (purge rate 50 mL/min) from 30 to 1,100 ?C. 8. Nanocomposites with different concentrations of nanofibers were

produced and tested, and their properties were compared with those of the neat resin.

9. Basically, six different percentages were chosen, namely 0.1, 0.3, 0.5, 1, 2, 3 wt %.

10. TEM images of cured blends were obtained with a Philips CM120 microscope applying an acceleration voltage of 80 kV.

Percolation threshold of carbon nanotubes ?lled unsaturated polyesters 11. For further verification, the same experiment was carried out for the unmodified UP resin, and the results showed that there were no endothermic peaks

12. The MUP resin was checked with d.s.c, scanning runs at a heating rate of 10°C min 1. Figure 4a shows that an endothermic peak appeared from 88 to 133°C, which indicates bond breaking in that temperature range.

13. On the basis of these results, it is concluded that a thermally breakable bond has been introduced into the MUP resin and that the decomposition temperature is around I lO°C. 14. The structures of the UP before and after modification were also checked with FTi.r. Figure 5 shows a comparison of the i.r. spectra of the unmodified and modified UP resins.

15This is probably a result of the covalent bonding of

the urethane linkage being stronger than the ionic bonding of MgO.

16. These examples show that different viscosity profiles can be designed with different combinations of the resins and thickeners according to the needs of the applications.

17. A small secondary reaction peak occurred at higher temperatures, probably owing to thermally induced polymerization. 18. Fiber-reinforced composite materials consist of ?bers of high strength and modulus embedded in or bonded to a matrix with a distinct interfaces between them.

19.In this form, both ?bers and ma-trix retain their physical and chemical identities,yet they provide a combination of properties that cannot be achieved with either of the constituents acting alone.

20. In general, ?bers are the principal load-bearing materials, while the surrounding matrix keep them in the desired location, and orientation acts as a load transfer medium between them and protects them from environmental damage.

21. Moreover, both the properties, that is,strength and stiffness can be altered according to our requirement by altering the composition of a single ?ber–resin combination.

22. Again, ?ber-?lled composites ?nd uses in innumerable applied ar- eas by judicious selection of both ?ber and resin.

23. In recent years, greater emphasis has been rendered in the development of ?ber-?lled composites based on natural ?bers with a view to replace glass ?bers either solely or in part for various applications. 24. The main reasons of the failure are poor wettability and adhesion characteristics of the jute ?ber towards many commercial synthetic resins, resulting in poor strength and stiffness of the composite as well as poor environmental resistance.

25. Therefore, an attempt has been made to overcome the limitations of the jute ?ber through its chemical modi?cation.

26. Dynamic mechanical tests, in general, give more information about a composite material than other tests. Dynamic tests, over a wide range of temperature and frequency, are especially sensitive to all kinds of transitions and relaxation process of matrix resin and also to the morphology of the composites.

27. Dynamic mechanical analysis (DMA) is a sensitive and versatile

thermal analysis technique, which measures the modulus (stiffness) and damping properties (energy dissipation) of materials as the materials are deformed under periodic stress.

28. he object of the present article is to study the effect of chemical modi?cation (cyanoethylation) of the jute ?ber for improving its suitability as a reinforcing material in the unsaturated polyesterres in based composite by using a dynamic mechanical thermal analyzer.

30. General purpose unsaturated polyester resin(USP) was obtained from M/S Ruia Chemicals Pvt. Ltd., which was based on orthophthalic anhydride, maleic anhydride, 1,2-propylene glycol,and styrene. The styrene content was about 35%.Laboratory reagentgrade acrylonitrile of S.D.Fine Chemicals was used in this study without further puri?cation. 31. Tensile and ?exural strength of the ?bers and the cured resin were measured by Instron Universal Testing Machine (Model No. 4303). 32. Test samples (60 3 11 3 3.2 mm) were cut from jute–polyester laminated sheets and were postcured at 110°C for 1 h and conditioned at 65% relative humidity (RH) at 25°C for 15 days.

33. In DMA, the test specimen was clamped between the ends of two parallel arms, which are mounted on low-force ?exure pivots allowing motion only in the horizontal plane. The samples in a nitrogen atmosphere were measured in the ?xed frequency mode, at an operating frequency 1.0 HZ (oscillation amplitude of 0.2 mm) and a heating rate of 4°C per min. The samples were evaluated in the temperature range from 40 to 200°C.

34. In the creep mode of DMA, the samples were stressed for 30 min at an initial temperature of 40°C and allowed to relax for 30 min. The tem- perature was then increased in the increments of 40°C, followed by an equilibrium period of 10min before the initiation of the next stress relax cycle. This program was continued until it reached the temperature of

160°C. All the creep experiments were performed at stress level of 20 KPa (approximate).

35. The tensile fracture surfaces of the composite samples were studied with a scanning electron microscope (Hitachi Scanning electron Microscope, Model S-415 A) operated at 25 keV.

36. The much improved moduli of the ?ve chemically modi?ed jute–polyester composites might be due to the greater interfacial bond strength between the matrix resin and the ?ber.

37. The hydrophilic nature of jute induces poor wettability and adhesion characteristics with USP resin, and the presence of moisture at the jute–resin interface promotes the formation of voids at the interface. 38. On the other hand, owing to cyanoethylation, the moisture regain capacity of the jute ?ber is much reduced; also, the compatibility with unsaturated polyester resin has been improved and produces a strong interfacial bond with matrix resin and produces a much stiffer composite. 39. Graphite nanosheets(GN), nanoscale conductive ?ller has attracted signi?cant attention, due to its abundance in resource and advantage in forming conducting network in polymer matrix

40. The percolation threshold is greatly a?ected by the properties of the ?llers and the polymer matrices,processing methods, temperature, and other related factors

41. Preweighted unsaturated polyester resin and GN were mixed together

and sonicated for 20 min to randomly disperse the inclusions.

42. Their processing involves a radical polymerisation between a prepolymer that contains unsaturated groups and styrene that acts both as a diluent for the prepolymer and as a cross-linking agent.

43. They are used, alone or in ?bre-reinforced composites, in naval constructions, offshore applications,water pipes, chemical containers, buildings construction, automotive, etc.

44. Owing to the high aspect ratio of the ?llers, the mechanical, thermal, ?ame retardant and barrier properties of polymers may be enhanced without a signi?cant loss of clarity, toughness or impact strength. 45. The peak at 1724 cm-1was used as an internal reference, while the degree of conversion for C=C double bonds in the UP chain was determined from the peak at 1642 cm-1and the degree of conversion for styrene was calculated through the variation of the 992 cm-1peak

46. Paramount to this scientific analysis is an understanding of the chemorheology of thermosets.

47．Although UPR are used as organic coatings, they suffer from rigidity, low acid and alkali resistances and low adhesion with steel when cured with conventional ‘‘small molecule’’ reagents.

48．Improvements of resin ?exibility can be obtained by incorporating long chain aliphatic com-pounds into the chemical structure of UPR.

47．In this study, both UPR and hardeners were based on aliphatic and

cycloaliphatic systems to produce cured UPR, which have good durability with excellent mechan-ical properties.

50．UPR is one of the widely used thermoset polymers in polymeric composites, due to their good mechanical properties and relatively inexpensive prices.

51．